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Содержание VT180 Series

Страница 1: ...EK VTl8X 1M OO1 Prepared by Educational services of Digital Equipment Corporation...

Страница 2: ...ny Inc WordStar is a registered trademark of MicroPro Inc Z80 is a registered trademark of Zilog Inc The manuscript for this book was created on a DIGITAL Word Processing System and via a translation...

Страница 3: ...1 5 DISK DRIVE CHARACTERISTICS 1 6 RELATED I XX UMENTATION 1 7 Digital Hardware and Software Documentation 1 7 Other Documentation 1 7 OPERATING INFORMATION INTR ODUCTION 2 1 TERMINAL OPERATION 2 1 CO...

Страница 4: ...es 3 15 Install the RF Shield 3 16 Install the Terminal Controller Module 3 17 Install the VT18X Control Module 3 17 Install the Chassis in the Bottom Cover 3 19 Install the VTI80 Logo 3 19 Install th...

Страница 5: ...4 10 ISSUING COMMANDS 4 10 RESIDENT AND TRANSIENT CP M COMMANDS 4 10 RUNNING APPLICATION PROGRAMS 4 11 SETTING THE SERIAL PORTS TRANSMISSION CHARACTERISTICS INTRODUCTION 5 1 PSETUP 5 1 Menu Mode 5 2 B...

Страница 6: ...cessor 6 7 CRT Monitor 6 8 Power Supply 6 8 Standard Terminal Port 6 8 EIA Drivers and Receivers 6 8 FIR E 1 C JC JC1 1 C 1 l 6 8 TERMINAL CONTROLLER DESCRIPTION 6 10 80 80 Microprocessor 6 10 Data Bu...

Страница 7: ...rt 6 62 Printer Port 6 64 General Purpose Serial Port 6 65 Terminal Controller and VT18X Control Module Interconnections 6 65 Disk Drive Controller 6 67 Disk Drive Controller Functional Description 6...

Страница 8: ...ess 6 102 Vertical Oscillator 6 102 Self Oscillation 0 0_ 0 6 102 Vertical Output 6 103 Lineariza tion 6 103 Horizontal Driver 6 103 Horizontal Deflection Operation 6 103 Horizontal Output Circuit 6 1...

Страница 9: ...ic Operation 7 10 Basic Test OJ eration 7 10 Ext ncl cl T t Opt ration 7 14 Individual Diagnostics 7 14 Incli iclual T t Exampl Dialog 7 1ti Floppy Test 7 17 Happy Test OJleration 7 17 Floppy T st cri...

Страница 10: ...d Cable 7 39 Keyboard SJ eaker 7 40 Keycaps 7 40 Top Cover 7 41 Video Monitor Board Digital or Elston 7 42 Flyback Transformer Digital or Elston 7 43 Bottom Cover Removal and Installation 7 43 Power S...

Страница 11: ...le Mode A 27 VT180 RECOMMENDED SPARES LIST RSL GLOSSARY OF TERMS AND ABBREVIATIONS FIGURES Page The VT180 Personal Office Computer 1 2 VT180 On Line General Block Diagram 2 2 VT180 Off Line General Bl...

Страница 12: ...3 27 VT180 Cable Connections with One Disk Drive Unit 3 28 VT180 Cable Connections with Two Disk Drive Units 3 29 Connecting vices to the Serial Ports 3 30 ComJX site Video Output 3 39 Tracks and Sec...

Страница 13: ...6 85 Type I tatus Re ister Format 6 90 Type n Read tor tatus Re ter Format 6 91 Type II Write tor tatus Re ister Format 6 92 General Control and tatus Re ster Format 6 94 COmmuni tions tatus Re ter F...

Страница 14: ...18 Communications Interface Connector 3 35 J1tc r Illtc r1f olln tor 3 J General Purpose Serial Interface Connector 3 36 RX180 Disk Port Interface Connector 3 37 riClI o 1t 1f 111t c ItClrClc tc ti 5...

Страница 15: ...r Port Signals 6 101 Keyboard Receiver Signals 6 120 VTI80 Displayed Error Messages 7 2 LED Error Codes 7 4 Required Settings for Features 7 7 CP1M Processor Factory Jumper Configuration 7 9 Diskette...

Страница 16: ...e A 25 A 25 A 25 A 26 Test Weights A 27 VT52 Compatible Mode Sequences A 28 VT180 Recommended Spares B 1 Character Set I esignations Tab Stop Sequences Mode Sequences Option Present Parameters A 28 A...

Страница 17: ...n Chapter 4 provides guidance for using the CP Mill operating system Chapter 5 describes the procedure for setting the transmission characteristics of the serial ports Chapter 6 contains a technical d...

Страница 18: ...uted between the VT180 the host computer and a variety of exter nal devices by four external input output ports multipin connectors The four external ports are 1 The disk drive port 2 The communicatio...

Страница 19: ...ins the following basic subunits and optional subunits I Basic subunits CRT video monitor Power supply Backplane wire frame and radio frequency RF shield Terminal controller module CP M processor modu...

Страница 20: ...box that contains the power supply for the drives The power switch for the drives is located on top of the mounting box Input output control and data signals appear on two EIA connectors located on th...

Страница 21: ...dity Maximum wet bulb Minimum dew point Altitude Nonoperating Specifications Temperature Relative humidity Altitude 1 3 4 Electrical Specifications Line voltage Single phase two wire Switch selectable...

Страница 22: ...ent and sculpturing similar to a stan dard typewriter with 18 key numeric keypad 18 key with period comma minus enter and four general purpose function keys Seven LEOs three are dedicated ON LINE LOCA...

Страница 23: ...nominal 25 ms maximum 335 ms maximum 20 ms maximum 48 tracks in TPI 40 2768 bits in BPI 125K bytes s 100 ms Soft 50 ms maximum Storage capacity bytes MFM Unformatted per disk Formatted nine records tr...

Страница 24: ...ssories and Supplies Group P O Box CS2008 Nashua New Hampshire 03061 1 9 2 Other Documentation Title Intel 8080 Microcomputer Systems User s Manual Zilog Z80 Technical Manual EIA Specifications RS 232...

Страница 25: ...ced in an input character buffer until processed When processed the received characters are taken from the buffer and displayed on the screen Figure 2 1 is a general block diagram showing the transmit...

Страница 26: ...CONTROLLER MODULE VT18X CONTROL MODULE T I I COMMUNICATION LINES __ _ JJ VT1SO VIDEO TERMINAL MR 1531 Figure 2 1 VT180 On Line General Block Diagram MONITOR I SCREEN DISK DRIVES I 8K 8YTE DISK DRIVE...

Страница 27: ...ragraph 2 6 5 5 TERMINAL POWER SWITCH POWER INPUT CONNECTOR POWER OUTPUT CONNECTOR VT180 TERMINAL MONITOR RXl80 DISK DRIVE POWER SWITCH POWER INPUT CONNECTOR MAIN FUSE VOLTAGE SELECTOR SWITCH FUSE VOL...

Страница 28: ...r codes when pressed Other keys such as CTRL SHIFT and CAPS LOCK do not generate character codes but modify the character codes generated by other keys If two character code keys are pressed at the sa...

Страница 29: ...s RESET _ _ i rn IIIJ I wrn 6 a000 0 00ITJ mc 0000 000 DJ I I MR 7535 Figure 2 5 Function Keys NO SCROLL NO SCROLL controls scrolling in the VT180 terminal Scrolling is the upward or downward movemen...

Страница 30: ...he BACKSPACE key while the VT180 is in terminal mode generates the backspace control character which moves the cursor one column to the left If the cursor is at the left margin when BACKSPACE is press...

Страница 31: ...rocedures described in Paragraph 2 6 before using the SET UP keys SET UP SET UP places the VT180 in set up mode The SET UP key is used in conjunction with other keys to examine or change terminal oper...

Страница 32: ...ess of the display I Cursor Control Keys In either SET UP A or B left arrow and right arrow move the cursor left and right A In SET UP B hold down the SHIff key press the A key and then release both k...

Страница 33: ...l RESET Grnrn rnrnrnmmrnrn6mD B ESC 1 2 3 4 5 6 7 8 9 0 _ SA AK 0G00 GJ0 J00OJOJ 1 I B CAI 0000 000 OJ JRETURN IT Loa I 100 0000CJ m SHIfT fEED I I GGGG 0000 00GCJ 00 R 0 D MR 7537 Figure 2 7 Keyboard...

Страница 34: ...the keyclick SET UP B feature is off 2 5 2 Bell Tone The terminal generates a bell tone in each of the following cases I When the bell character is received from the computer 2 When the cursor is eig...

Страница 35: ...ent status of the other terminal features The terminal features can be reviewed and changed by pressing the SET UP key shown in Figure 2 8 when the CP M prompt indicates that the system is waiting for...

Страница 36: ...SET UP A I 1234 T T T J456 T i r r T 1234 ffi7 Figure 2 9 SET UP A Display SET UP B H H Figure 2 10 SET UP B Display 2 12 T 9600 R 9600 MR 7032...

Страница 37: ...ed Answerback X X X X These features may be selected only for communications between the terminal and an external host computer The data parity bits and transmit and receive speed are fixed when the V...

Страница 38: ...re listed in Table 2 2 Table 2 2 Set Up Features the Host Computer Can Change Set Up Feature On off line Screen brightness Columns per line Tab stops Scroll Auto repeat Screen background Cursor Margin...

Страница 39: ...d by pressing the SHIff and R keys at the same time while in set up mode The terminal will clear the screen and display the word WAIT briefly in the upper left corner then return to the SET UP A displ...

Страница 40: ...nd the terminal can transmit and receive character codes Keyboard entries are transmitted to either the internal computer or host computer through CP M and characters received from either com puter ar...

Страница 41: ...et to 132 eolumn mode Set Clear Tab and Clear All Tabs The bottom line of the SET UP A display Figure 2 9 is a ruler that numbers each column position on a line Each T above the ruler indicates a pres...

Страница 42: ...These are characters displil led using 80 colullllS Figure 2 11 80 and 132 Column Displays 2 18 MA 7775 MR 9239...

Страница 43: ...ooth scrolling moves the text a scan line at a time that is 1 256th of the screen height jump scrolling moves text a printed line at a time that is 1 24th of the screen height The advantage of smooth...

Страница 44: ...k background in reverse screen mode the display contains dark charac ters on a light background The normal and reverse screen displays are shown in Figure 2 13 Set the digit associated with this featu...

Страница 45: ...d when the United Kingdom character set is selected Set the digit associated with this feature to 0 to select the United States character set Interlace In normal operation the VT180 terminal uses only...

Страница 46: ...umes transmis sion when an XON OCt code is received regardless of the auto XON XOFF feature setting Wraparound When this feature is enabled the 81st or I33rd character depending on the line size selec...

Страница 47: ...ransmission If a transmission error occurs the VT180 detects it and indicates its presence by placing a checkerboard character n on the screen in place of the character with the error The parity sense...

Страница 48: ...selected when the transmit or receive speed is set 2 6 5 7 SET UP B Answerback Message Answerback is a question and answer sequence in which the host computer asks the terminal to identify itself The...

Страница 49: ...and go back to step 2 This is the only way to correct errors in the answerback message 4 Type the answerback message The message may be up to 20 characters including space and control characters Contr...

Страница 50: ...of the monitor and disk drive unit Several ventilation openings on the terminal and disk drive prevent these units from overheating The disk drive has ventilation openings on the back sides and botto...

Страница 51: ...N 36 8 14 8 9CM 3 1 2 IN 4 8 CM 1 7 8 IN 1 30 32 CM 11 15 16 IN 11 1 _ 33 49CM 133 16 IN 1 10 79 CM 4114 IN 9 41 3 CM 16 1 4 IN 45 7 CM 18 IN VTI80 TERMINAL AND KEY80ARD RXI80 DISK DRIVES MEASUREMENT...

Страница 52: ...o a VT180 personal office computer The VT18X upgrade kit is packed in a reinforced carton which contains the following parts Parts Kit Part Number 1 1 1 1 1 1 2 1 1 1 1 1 VT18X control module VT180 pa...

Страница 53: ...CKING INSTRUCTIONS I MR 7673 Figure 3 3 VT18X Shipping Carton If a second disk unit drives C and D is included in the shipment instructions for unpacking the unit are provided by the RX180 Unpacking G...

Страница 54: ...er I 1 Flat blade screwdriver I Needlenose pliers NOTE The VT180 does not support the 20 mA option VTIXX AA nor the printer port option VTIXX AL AM AU AV 3 4 1 Check the ROMs on the Terminal Controlle...

Страница 55: ...the terminal Unplug any video in or video out cables See Figure 3 4 3 With a screwdriver loosen the four captive screws from the module access cover at the back of the terminal Remove this cover it w...

Страница 56: ...5 from the terminal controller module 6 Remove any module installed in the STP connector on the terminal controller module Figure 3 5 The printer port option VTIXX AC is not used in this new computer...

Страница 57: ...ule 8 If previously removed check for the presence of ROMs and jumpers or switches on the advanced video option AVO Except for a VT100 with a word processing option the VTl80 uses no ROMs or jumpers o...

Страница 58: ...180 Paddle Board Use the following procedure to install the VTl80 paddle board 1 Insert the VT180 paddle board 54 15150 in the STP connector on the terminal controller mod ule Figure 3 9 Fasten this p...

Страница 59: ...CONNECTOR DROMs o o D J6 J2l J _ _ TERMINAL CONTROLLER MODULE MR 1114 Figure 3 9 Installing the VT180 Paddle Board 3 4 3 InstaU the Expansion Backplane on the Card Cage Use the following procedure to...

Страница 60: ...moval 2 Remove the bottom cover on the video terminal as follows a When facing the front of the terminal turn it on its left side and remove the four screws if present fastening the bottom cover to th...

Страница 61: ...Pull the fasteners up until they click c Using both hands grasp the chassis by its center support bar and lift it up and out of the bottom cover 3 Remove the 22 pin connector Figure 3 12 from the fro...

Страница 62: ...6 If the notch is not present you will have to remove the key plug from J6 of the expansion backplane or you will not be able to insert the module into the backplane Use needlenose pliers to pull the...

Страница 63: ...WIRE FRAME PLASTIC CLIP CHASSIS EXPANSION BACKPLANE SPACERS J4 J6 J4 MR 7876 Figure 3 14 Installing the Expansion Backplane 3 14...

Страница 64: ...the terminal con troller module which had a slot in its connector J6 The slot was later removed and the key plug was no longer needed When installing the VT18X into an early VT100 you must remove the...

Страница 65: ...1 Set the chassis on end with the card cage up Figure 3 16 2 Remove the four 1 4 inch hex head screws from the card cage two on the top and two on the bottom 3 Slide the RF shield on the card cage Fig...

Страница 66: ...cations switches on the VT18X control module Figure 3 17 for the correct positions which are listed in Table 3 2 The switches as set allow you to run the VT180 with most full and half duplex communica...

Страница 67: ...VT180 ToVT180 From VT180 From VT180 From VT180 From VT180 CommPort Jl Pin Assignment 4 5 13 12 11 2 14 19 Circuit CCITT EIA 105 CA 106 CB 121 SCE 112 CI l09 CF 120 SC 103 BA 118 SB 120 SG 10 Off SPDS...

Страница 68: ...m Cover Place the chassis in the bottom cover and fasten the bottom cover with the four pop fasteners If the termi nal is to be sent to another location turn the terminal on its left side and install...

Страница 69: ...over on the chassis and fasten it to the bottom cover with four pop fasteners Press up on the fasteners until they click Figure 3 10 3 4 11 Install the New Metal Module Access Cover Rear Shield Instal...

Страница 70: ...e terminal 3 4 12 Checking the RX180 Drive Select Switches The RX180 disk drive unit contains drive select switches that are used to configure the drives as A and Bor C and D The VT18X upgrade kit inc...

Страница 71: ...m the four corners of the bottom of the disk drive unit 3 Using both hands tip the unit back on its base facing you 4 Facing the front of the unit grasp the rear corners of the top cover and guide the...

Страница 72: ...No s L z I L 1 W A 11 oJ j 0 S TERMINATOR RESISTOR PACK NOTE TERMINATOR RESISTOR PACK INSTALLED IN DRIVE A ONLY SLIDE SWITCHES RX180 DISK DRIVES MR 7680 Figure 3 22 Setting the Drive Select Switches...

Страница 73: ...ntroller module Figure 3 6 2 If a printer port option is removed remove the ROMs on the terminal controller module and replace them with the ROMs you saved when you installed the printer port option R...

Страница 74: ...ion 3 4 14 Word Processing Option A VT100 word processing terminal VTIOO WA or WB can be upgraded to a VT180 A word processing terminal has one ROM installed in the ROM A position on the advanced vide...

Страница 75: ...rm the following steps to install the terminal 1 Make sure the unit is not connected to the power source 2 Attach the BC26K terminal to disk I O cable 17 00297 to the disk port on the module access co...

Страница 76: ...it clockwise 5 Turn the power ON OFF switch to the off 0 position 3 5 2 Install the RXlS0 Disk Drive Unit s Use the following procedure to install one or two dual disk drive units CAUTION If you have...

Страница 77: ...nal 3 If you have two disk drive units place RX180 AB drives A and B on top of RX180 AD drives C and D Set the power ON OFF switch on RXI80 AD drives C and D to the on 1 position 4 Attach the BC26K ca...

Страница 78: ...end without prongs in the ac input of the bottom disk drive unit Figure 3 27 8 Plug the end of a coiled line cord with prongs into the ac output of the bottom or only disk drive unit plug the other e...

Страница 79: ...ORT TO PRINTER PRINTER PORT GENERAL PURPOSE PORT DISK DRIVE PORT I I I V T lB O COMMUN ICATlONS PORT REMOTE SYSTEM NULL MODEM CABLE TERMINATING AT VT1BO END IN FEMALE RS232 CONNECTOR B COMMUNICATIONS...

Страница 80: ...self test verifies correct operation of the VT180 each time it is powered up or reset by a reset command pressing the 0 key while in SET UP A The self test program does the following 1 It waits until...

Страница 81: ...Copyright 1982 Digital Equipment Corp Press A B C D S or T A Start System drive A B Start System drive B C Start System drive C D Start System drive D S Execute Self test T Enter Terminal Mode NOTE I...

Страница 82: ...e failure Refer to Chapter 7 for additional information 3 7 2 VT18X Diskette Diagnostic The VTI8X diskette diagnostic resides on one diskette BJ T040B MV The diagnostic is loaded from this diskette th...

Страница 83: ...ates supported are 50 75 110 134 5 150 200 300 600 1200 1800 2000 2400 3600 4800 9600 and 19 200 Any and all protocols to be supported by this port other than pass through mode are run as applications...

Страница 84: ...24 25 Not used Speed indicator secondary receive line signal detector Secondary clear to send Secondary transmit data Transmitter clock Not used Receive clock Not used Secondary request to send Data t...

Страница 85: ...D DTR j 3 8 4 RX180 Disk Port Connector This is an interface designed to control up to four 4 inch disk drives The controller supports double density drives using MFM recording Only soft sectored sing...

Страница 86: ...und Index Ground Select 0 Ground Select 1 Ground Select 2 Ground Motor on Ground Direction Ground Step Ground Write data Ground Write gate Ground Track 00 Ground Write protect Ground Read data Ground...

Страница 87: ...zontal blank width Front porch 2 33 JlS 50 os 27 28 s 200 ns 4 771 JlS 50 ns 11 84 JlS 50 ns 80 column mode 12 34 JlS 50 ns 132 eolumn mode 1 54 s 50 os 3 8 5 2 Video Input Connector J8 An analog sign...

Страница 88: ...HZ INT 75 SCANS SCANS IN ODD FIELD I N 60 HZ INT 2 5 SCANS I I L 50 HZ INT 24 5 SCANS I I I I rff r LJUL nr ITt u TIME TlME OV OV 1 0 V ODD FIELD LAST DISP EVEN FIEl MR 9238 MA ga3 I Jn n j I V SYNC...

Страница 89: ...iskettes The computer stores and retrieves files by referring to tracks and sectors on a diskette see Figure 4 1 VT180 diskettes have 40 tracks numbered 0 through 39 each composed of nine sectors Sect...

Страница 90: ...can cause unreliable operation resulting in loss of data or data that is inaccessible To guard against this possi bility always insert the diskette carefully pushing it gently back in the drive as far...

Страница 91: ...cover Do not toucb tbe diskette surfaces with your fmgers see Figure 4 2 Keep diskettes away from electronic apparatus electric motors magnets and screwdrivers Do not lay diskettes even for a short ti...

Страница 92: ...k with the label up and the write protect tab to the left See Figure 4 2 5 Press A You should immediately hear clicking and whirring sounds from drive A This means that the system has begun reading th...

Страница 93: ...li DDFIIT COli ASII COli STAT COli COli lIoVCPII COli COli SU8111T COli COli DUIIP COli Mft 7260 Figure 4 5 Directory Display If you are the first user of a newly installed system you must make a copy...

Страница 94: ...away all diskettes Then turn off the power switch on top of the disk drive unit CAUTION Never turn system power on or off wbile a diskette is inserted in any drive 4 5 COPYING THE CP M MASTER DISKETT...

Страница 95: ...Your new diskette is ready to receive data To copy the CP M master system diskette to drive B continue as follows A DDF T DISK DDEN FDR AT IVERIFY PRDGRA 10 81 REVA I SELECT DRIVE A 6 C OR 0 OR RETUR...

Страница 96: ...rrently being copied or verified When the copying operation is complete the system will display RD TRACK 39 COpy VERIFY COMPLETE TO DRIVE B SELECT DESTINATION DRIVE B C D OR N ULL OR RETURN TO EXIT 10...

Страница 97: ...2 The power is already on the system was previously started and you want to reset the system for example to switch from terminal mode to computer mode To perform a reset press the SET UP key and then...

Страница 98: ...ndicate that the RETURN key must be pressed A few CP1M programs ask questions requiring a single character response Some of these programs pro cess the response as soon as it is typed without waiting...

Страница 99: ...u type the file name Alternatively you can copy the file to the current diskette if space permits Examples of transient commands that are used most frequently follow DDCOPY COM DDFMT COM ED COM PIP CO...

Страница 100: ...to connect to these ports you must select appropriate characteristics with PSETUP Table 5 1 Serial Port Default Characteristics Port Printer General purpose Communications Transmission Speed Baud Rate...

Страница 101: ...port even if you are not using it before you are allowed to choose a rate for the printer port PSETUP does not give you the option of setting the communications port baud rate since this can be done...

Страница 102: ...M This selection causes PSETUP to implement whatever selections you have made and then returns to the CP M prompt NOTE Pressing RETURN alone in response to a giyen menu causes all selections proyided...

Страница 103: ...TION COMM PORT DATA STOP BITS PARITY GENERAL PURPOSE PORT DATA STOP BITS PARITY PRINTER PORT DATA STOP BITS PARITY SHOW ALL SELECTIONS MADE SET PARAMETERS TO DEFAULT VALUES RETURN TO CP M P RET GP GEN...

Страница 104: ...ULT VALUES RETURN TO CP M FOR 7 DATA BITS 8 DATA BITS p2 8 RET FOR 1 STOP BIT 2 STOP BITS FOR NO PARITY EVEN PARITY ODD PARITY FOR BAUD RATE SELECTION COMM PORT DATA STOP BITS PARITY GENERAL PURPOSE P...

Страница 105: ...ransmission characteristics for the printer port as those specified in the previous menu mode example A PSETUP RET PRESS KEY B C G P S D R FOR BAUD RATE SELECTION COMM PORT DATA STOP BITS PARITY GENER...

Страница 106: ...for the operation that was current at the point the error was encountered Note that you cannot make serial port selections permanent if your PSETUP diskette is equipped with a write protect tab The ef...

Страница 107: ...VT180 personal office computer is a VT100 terminal that has been upgraded by installing a VT18X personal office computing upgrade kit The addition of the VT18X upgrade kit provides the basic VT100 wi...

Страница 108: ...OMPUTER I _______ J VT18X CONTROL MODULE MR 8038 Figure 6 1 VT180 System Block Diagram 6 2 1 1 Terminal ControUer M ule The terminal controller is a single module that manages all dis plays and all co...

Страница 109: ...communications ports and an RX180 disk drive controller The communications ports and disk drive con troller functions are described in the following paragraphs Console Port The console port communicat...

Страница 110: ...le Signals are passed from the VT18X control module through a ribbon cable to the VT180 paddle board This port requires a null modem cable A BC26U XX is the recommended cable for this port Another cab...

Страница 111: ...LOCAL J4 DRIVERS J7 ON L1NE AND KEYBOARD KEYBOARD TRANSMIT TRANS RCVRS TRANSLATOR BUFFER CEIVERS SHADED BOXES MICROPROCESSOR PROGRAM FUNCTIONS POWER TERMINAL CONTROLLER MODULE EDG CON SUPPLY MR 8039 F...

Страница 112: ...t of the VT180 6 3 6 Keyboard The keyboard is the user s input device to the terminal The keyboard s output is a serial data signal that travels along the same wire as data coming from the terminal Th...

Страница 113: ...ne a control function are seen Then the microprocessor executes the control function immediately or discards it if it is not a valid function Noncontrol codes are recognized by the parser and are imme...

Страница 114: ...ry noticeable Most distortions disappear by matching the refresh rate to the power line frequency The VT100 can refresh at either ofthe two world power frequencies 50 Hz or 60 Hz satisfying both flick...

Страница 115: ...BD DATA ADDRESS STATUS CONTROL INTER INTER AVAILABLE H KBD RD KBD UP DMA CHIP RUPT RUPT lINTERr COMMAND KEY DOW VERTICAL FREOUENCY RECEIVER TRA INTERRUPT INTERRUPT ROUTINE INTERRUPT OAT ROUTINE ROUTIN...

Страница 116: ...e keyboard UART and put it in the key buffer The vertical frequency interrupt routine occurs every fiftieth or sixtieth of a second and provides synchronization of video routines with the actual displ...

Страница 117: ...LAG w I J D 8 E 8 ACCUMULATOR FLlP FLOPS w Vl REG REG LATCH a H B L B _RE 8 w t INSTRUCTION REG REG A DECODER t l 16 ARITHMETIC STACK POINTER V w LOGIC AND a UNIT MACHINE 16 PROGRAM COUNTER CYCLE ENCO...

Страница 118: ...rporation s 8080A manual 6 5 2 Data Bus and System ControUer The microprocessor data bus passes directly to the 8228 bus driver and system controller This device pro vides TTL output buffering and lev...

Страница 119: ...S 1 BUFFER BUFFEF ED ONE WAY DATA OUTPUT BUS ILATCH ADDR ILATCH 4 IDC012 BUFFER 2K xa AND a 1E58 8 8 E15 E20 B 8 E16 a 7 I E4 E9 TIMING BIDIRECTIONAL DATA BUS a ALT IDCOll a 1 a CHAR 1 1 4 1 1 LINE BU...

Страница 120: ...The ready input is not used in the VT100 It is an asynchronous input that gets synchronized to the machine cycles in the 8224 The synchronized signal can cause the microprocessor to enter a wait state...

Страница 121: ...R INTA starts early to enable the chip selects and allow the data buses to stabilize Data bus in DBIN goes high before data settles but does not latch data into the 8080 until its falling edge when da...

Страница 122: ...7FFF 8000 9FFF AOOO BFFF COOO FFFF 8Kx8 3Kx8 IKx8 4Kx4 16Kx 8 2Kx8 2Kx8 2Kx8 2Kx8 8Kx8 8Kx8 16Kx 8 Basic ROM Screen and scratch RAM AVO screen RAM Attribute RAM Unassigned Program memory expansion use...

Страница 123: ...this single chip select to allow for 64K ROMs that do not have a programmable chip select Table 6 2 shows the addressing of the ROMs Table 6 2 ROM Chip Select Addressing Address Line 11 o 1 o 1 Addres...

Страница 124: ...6 3 illustrates this by the presence of hex 2 in the low half of each non PUSART address byte Table 6 3 List of Hex I O Addresses Address Read or write OOH 01H Device PUSART data bus PUSART command po...

Страница 125: ...uency 28H Vertical frequency and keyboard 30H Vertical frequency and receiver 38H Vertical freq ncy eceiver and keyboard The RST instruction disables further interrupts pushes the current program coun...

Страница 126: ...C clock signals Certain pins on the PUSART are labeled with stanPard modem control designations These pins are readable data set ready DSR or writable data ter inal ady DTR and request to send RTS as...

Страница 127: ...ESET TxC TxD RxC RxD RxRDY TxRDY DSR DTR SYNDETI BRKDET RTS CTS TxEMPTY DATA BUS 8 BITS CONTROL OR DATA IS TO BE WRITTEN OR READ READ DATA COMMAND WRITE DATA OR CONTROL COMMAND CHIP SELECT CLOCK PULSE...

Страница 128: ...by the microprocessor The data terminal ready signal DTR is unasserted in local mode 6 5 8 3 PUSART Programming The microprocessor can program the PUSART to operate with several standards and paramet...

Страница 129: ...E FE REQUEST TO SEND HIGH WILL FORCE RTS OUTPUT TO ZERO INTERNAL RESET HIGH RETURNS B251A TO MODE INSTRUCTION FORMAT ENTER HUNT MODE 1 ENABLE SEARCH FOR SYNC CHARACTERS HAS NO EFFECT IN ASYNC MODE NOT...

Страница 130: ...AT NOTE TxRDY STATUS BIT HAS DIFFERENT MEANINGS FROM THE TxRDY OUTPUT PIN THE FORMER IS NOT CONDITIONED BY CTS AND TxEN THE LADER IS CONDITIONED BY BOTH CTS AND TxEN i e TxRDY STATUS BIT DB BUFFER EMP...

Страница 131: ...or leave the device in serial form through a single bidirectional line Information is shifted with an external clock Identification of the meaning of the bit stream is made by setting three control l...

Страница 132: ...ddress signal LBA 7H It occurs at the horizontal line rate 15 734 kHz This is the bit shifting rate during address and data trans fers A read operation requires only a single clock cycle to transfer d...

Страница 133: ...its The gate circuits encode the data and keyboard clocks into a pulse width modulated signal that is sent to the comparator and then transmitted to the key board over the single wire Serial data from...

Страница 134: ...n times once for each scan and remain only until the next character in the line is displayed Each character in a line is stored in one of a group of adjoining locations in the screen RAM See Figure 6...

Страница 135: ...bit so it can be output to the stream two or three extra times depending on line length to fill the intercharac ter space The stream enters the DC012 control chip where the final adjustments for video...

Страница 136: ...column mode In addition it allows each character to have four more attributes for a total of five Three of the AVO attribute bits enter the DC012 to control displayable features of each character The...

Страница 137: ...L DOT I VERT RESET DIVIDER COMP 1 DRIVE H HORIZ VERT VERT H SYNC TIMING H 1 TIMING BLANK L 9 DIVIDER OUTPUTS 9 GEN 1 10 VERT DIVIDER VERT I 10 RESET H 3 5 1 I RESET H VF VERT H5 10 RESET L 3 80 2 HF 1...

Страница 138: ...the display 80 132 Column Selection The column mode is changed by modifying the divisors of three of the counters in the oeo11 The first of these counters divides the input clock MASTER CLK by 1 5 to...

Страница 139: ...m the outputs of the dot counter and its set up and hold times are guaranteed by internal propagation delays In double width mode VSR lD H is created by selecting every other CHAR ClK and then delayin...

Страница 140: ...H HIGH LOW TRANSITIONS r I 5 608 j lS 1 1 _ NOTE HORIZONTAL BLANK H IS SHORTER THAN ACTUAL HORIZONTAL BLANK TIME MA B061 Figure 6 14 Horizontal Timing HORIZ BLANK H is designed to allow 83 characters...

Страница 141: ...ts of two fields Even fields start at the top of the screen and display 240 scan lines before reaching the bottom Odd fields place their first scan line between the first and second scans of the prece...

Страница 142: ...16 65 MS 16 72 MS I il n 5 6 AS fL MR 8OB9 Figure 6 15 Vertical Signals 60 Hz 50 HERTZ NONINTERLACED VERT DRIVE 1 1_ _ 0_2_M_S 1 11 I 20 02 MS 20 02 MS 1 VERT BLANK l 4 77 MS 1 I 4 77 MS 1 I I 1 59 MS...

Страница 143: ...nformation The composite sync generator in the OCO11 uses outputs from the dot horizontal and vertical counters to generate the complex timing of COMP SYNC L COMP SYNC L consists of one of the vertica...

Страница 144: ...e offset for smooth scroll The scroll latch is loaded in two passes first writing the two least significant bits and then the two most significant bits Because the offset is a decimal value controllin...

Страница 145: ...F CNT BOUNARY DET TOP HALF o HIGH I ClR SCAN 2 TOP SCAN REV 1 COUNTER 4 FIELD VERT FF J FREO L INT FF 1 CNT BASIC ATR ClR lATCH 3 1 4 ClR NEW q HOLD SCROll ClK REO SCROll FF SCROlliNG ZONE lATCH 1 ATI...

Страница 146: ...he DCO12 to extend hold request during double width The second set of latches for double width and double height are clocked by the rising edge of hold request similar to the second latch for double w...

Страница 147: ...the double height bit and the top and bottom half bit and decides whether those scan counts need to be modified for double height before going out of the chip If double height is not asserted the top...

Страница 148: ...ld be disabled by the next falling edge of the H CLK signal but the VT180 is programmed to always end hold request with terminate If the VT180 was not working correctly hold request might be ended by...

Страница 149: ...aller brighter white areas of normal characters Bold and reverse asserted together give a background of normal intensity Blink applied to nonreverse characters causes them to alternate between their u...

Страница 150: ...ntations of the desired characters stored in the screen RAM Each code is used as the high 7 bits of the address to a 2K by 8 ROM That provides enough storage for 128 characters The eighth character bi...

Страница 151: ...I I I I I I I I t f 4 t t I I I I I I I I I I I I I I I I I t t t t I I I I I I I I 1 I I I I I I I I I t _ _ t I I I I I I I I I I I I I I I I I I I f t t I I I I I I I I fUtttt_ I I I I I I I I I I...

Страница 152: ...t t I I I I I I I I I 1 I I I I I I t t 01 t t I I I I I I I I t I I I It I I I I I t t 10 t t I I I I IU I It I I I I I It I I I t t 117 t t I I 0 I I I I I I _ I I I I I I I I t t 12 t t I I I I I I...

Страница 153: ...tor s blanking effect is taken over by horizontal blank and the terminate flip flop in the DeOl2 is held cleared until just before the first character in the next scan This prevents undefined data fro...

Страница 154: ...I N D C O 1 2 _ _ I HOLD REQUEST H I 3 C H A R S I 1 11 _ I 1 3CHARs _ _1 l J I I VALID DATA AVAILABLE i I AT E15 OUTPUT I I I ADDRCOUNT U U U U U U I I I ADDR L D U I DMA ENA H I E22 9 CHARACTER LATC...

Страница 155: ...of the termi nal controller video input and output circuits Direct Drive Video The two video outputs from the DCOl2 video out I and video out 2 are combined with the vertical blank signal in two open...

Страница 156: ...l the display of the lines and characters This region of memory contains the displayable characters their attributes the line attributes and the addresses that link one line to the next The microproce...

Страница 157: ...ddress at the end of each line points to the first location of the next line At start up this is the next physical location The end of the last line points to a fill line which points to itself The fi...

Страница 158: ...t result from receiving a new character a cursor position command a line feed etc The microprocessor calculates the appropriate screen RAM address from the combination of previous line and column plus...

Страница 159: ...ine displays the cursor and letters T to indicate tab positions Then the microprocessor counts from the beginning of the tab bytes in the set up area to find the bit corresponding to the column number...

Страница 160: ...ress bus A15 0 H Six Z80A outputs are used to control various functions performed by the logic circuits on the VT18X control module Three inputs from the logic circuits on the VT18X control module are...

Страница 161: ...BIT DATA BUS 07 00 H DIAGNOSTIC TRANSCEIVERS LEOS rOD4 DIAGNOSTIC 003 BUFFERED DATA BUS DB7 DBO H WRITE 002 REGISTER Y 001 CONSOLE PRINTER GENERAL COMM MODEM PORT PORT PURPOSE PORT SELECT SERIAL SWIT...

Страница 162: ...T interrupts and are reset by a dummy read to location 90H All interrupts including the RTC are turned off while doing a disk drive I O Therefore the RTC cannot be used for a time of day clock and is...

Страница 163: ...5 A7 A5 A3 l J C P U Z W R Y ITE f ol DECODER L A 7 A 5 A3 1 0 READ CPU ZRD l DECOOER J A15 AO Z80A CPU L _ A B r CPU 10RO L rl O CPU ZIORO L p J CPU he_ lJL Si 1 W BRJL _ Z R L I DISK GENERAL DRIVE I...

Страница 164: ...E52 50NS 2 DOH 01 R1 l DELAY ROM 11 EGO CTl CAS l ZBOA 1 A 2 ENB RAM CPU ZRFSH l 0 CPU FF DO TIMING 1 64K BYTE E29 5 RAM ClK ClK ClR 0 E37 CTl RAS l J ViR J IORWR 9B l I MREQl 1E61 EGO 5 0 1 WRITE CO...

Страница 165: ...lear the write control FF CTL WRITE L therefore is active and allows the data D7 DO H to be written into the RAM location specified by address bits A15 AO H 6 6 4 8K Byte ROM The VT18X control module...

Страница 166: ...d by the console port include transmit data CON XMIT DATA H receive data CON REC DATA I H and data terminal ready CON DTR L from the terminal controller module for control Software must support XON XO...

Страница 167: ...SIRD L DSR N 12 a 10ARD SOL READ RCLK TCLK 0 EN J I 0 i T t CON CK H 115 7 K BAUDI 3 IOAWR 96L 0 DB2 1 H DIAG SYNC SEL H en A5 J H 1 0 MFUWR L WRITE LOOPBACK H WRITE REGISTER A7 H of 10AWR SOL k CPU Z...

Страница 168: ...transmit and receive baud rate clocks for this port are derived from the baud rate generator on the terminal control ler module Therefore the transmit and receive baud rates selected in the VT180 s s...

Страница 169: ...COM RLSO 8 RLSO COM RI SENOCK RECCK 22 1 15 1 17 l _ W12 1 0 7 RI SEND CK RECCK PROTGNO EIA RET MR 8042 Figure 6 27 Communications Port Modem Switches 6 63...

Страница 170: ...gh when bit 2 DB2 of the diagnostic write register address 98 H is programmed to one When SYNC SEL is high the host computer supplies the transmitter and receiver clocks for the communications PUSART...

Страница 171: ...the VTI8X control module General Purpose Serial Port Functional Description The term I PUSART is enabled for reading or writing by IOASEL 50 L from the I O port select decoder when the CPU places addr...

Страница 172: ...M XMIT DATA H 2 A9 1 18 CARRIER DETECT COM REC DATA H 0 A9 2 17 CARRIER DETECT 8 20 COMDTR L 8 8 COM DSA L A1Q l 20 RING INDICATOR A1Q 2 19 RING INDICATOR 22 4 COM RTS All l 0 AII 2 co 3 A12 1 24 SPEE...

Страница 173: ...oop and associated logic The functional relationship of the major components is shown in Figure 6 29 and described in the following paragraphs 6 6 10 2 Formatter Controller The disk drive formatter co...

Страница 174: ...38 __ D R O H INTR OI 3 9 R Oc H 2SONS I Wl0 I OS WG 30 WG H WG K ES4 R Cl r i l l EARLY 17 EARLY EARlY RDOr I lATE 18 lATE l lATE VT18X iiirnl 37 D Dl E Nl l __ T _t _l I DOUB l E I DDEN DENSITY VFO...

Страница 175: ...s G x x16 x5 1 The CRC includes all information starting with the address mark and up to the CRC characters The CRC register is preset to ones prior to data being shifted through the circuit Arithmeti...

Страница 176: ...the drive Also hex 01 is loaded into sector register Ground 5 V 5 12 V 5 Computer interface 2 3 4 5 6 Write enable Chip select Read enable Register select lines WE CS RE AO AI LSI WR L A logic low on...

Страница 177: ...formed If ready is low the read or write operation is not performed and interrupt is generated Type I operations are performed regard less of the state of ready The ready input appears in inverted for...

Страница 178: ...per ations respectively 39 Interrupt request INTRQ IRQH This open drain output is set at the com pletion of any command and is reset when the status register is written to Disk drive interface 15 16 1...

Страница 179: ...rols the loading of the read write head against the media This output informs the drive that the read write head is positioned between tracks 44 76 This output is valid only during read and write comm...

Страница 180: ...KH PUH POL 6 74 Strobe output from the 1691 Strobe will latch at a high level on the leading edge of WOIN and reset to a low level on the leading edge of 04 It is not used by the VTI8X control module...

Страница 181: ...30 shows binary data encoded into MFM format and Figure 6 31 shows how the diskette flux reversals shift the peaks ofthe composite read voltage waveform The PLL includes a write precompensation circui...

Страница 182: ...goes low while VFOE and WG are low the pump up PU and pump down PD signals become active PU and PD are three state output signals used to control the fre quency of the VCO and therefore the frequency...

Страница 183: ...er controller and the disk drive via pin 16 of connnector J2 OSI and DSO are sent to the general control and status register and are used to inform the CPU of the disk drive currently selected OSI and...

Страница 184: ...n on the diskette When this signal is low it indicates that the read write head is positioned at track zero outermost track When this signal is low it indicates that a write protected diskette is inst...

Страница 185: ...mmand instruction The mode instruction can be programmed in either a syn chronous or asynchronous format The asynchronous mode instruction can be used by all of the I O ports but synchronous mode can...

Страница 186: ...elected Bit 1 Bit 0 Mode Selected o o I 1 o 1 o 1 Synchronous mode 1X clock 16 X clock 64 X clock 2 3 Character length select These bits hold the encoded value of the character length to be selected B...

Страница 187: ...truction Format Synchronous 59H WO Table 6 15 Synchronous Mode Instruction Bit Description Description 0 1 2 3 Character length select Always O These bits hold the encoded value of the character lengt...

Страница 188: ...a terminal ready Receiver enable Send break character Error reset Request to send Internal reset Enter hunt mode This bit must be set to enable the transmitter function This is a general purpose contr...

Страница 189: ...con ditioned by these signals 1 Received ready This bit corresponds with the output pin of the same name When set it means that the receive data buffer is full and the CPU must read it This is the bit...

Страница 190: ...to output modt low upon a reset When used as an output the SYNDET pin will go high to indicate that the 8251A has located the sync character in receive mode While in bi sync mode the SYNDET line will...

Страница 191: ...in Figure 6 37 Table 6 18 describes the bits 07 06 05 04 03 02 01 00 l J T I RECEIVED DATA BITS DATA OR PARITY MR 8048 Figure 6 37 Received Data Format 40H 48H 50H 58H RO 6 6 13 Disk Drive Controller...

Страница 192: ...e delay that must be observed between operations of registers Tables 6 21 and 6 22 show type I command bit descriptions and flags Tables 6 23 6 24 and 6 25 show type II command and type III command bi...

Страница 193: ...is complete and an interrupt is generated If not valid the seek error status is set This bit determines if the head is to be loaded at the beginning of a command If the head is loaded then the head r...

Страница 194: ...ng valid data on the diskette this bit should be set Always O When set during a command there is a 30 ms delay before reading begins For maximum controller throughput this bit should be O It should be...

Страница 195: ...11 12 13 Interrupt condition flag 0 Interrupt condition flag 1 Interrupt condition flag 2 Interrupt condition flag 3 10 1 Not ready to ready transition 11 I Ready to not ready transition 12 1 Index p...

Страница 196: ...si tioned at track O 3 10 field CRC error 4 Seek error When set this means that there was a CRC error of the 10 field When set a seek error was encountered meaning that the desti nation track address...

Страница 197: ...or the CPU to read the register When set this bit means that the data register had not been serviced within 27 5 microseconds and the data in the data register is not valid When set this bit indicates...

Страница 198: ...empty and it is waiting for the CPU to write the register When set this bit means that data register had not been written within 23 5 1J S and the data on the diskette is not valid zero bytes are subs...

Страница 199: ...n the formatter controller is set The step step in and step out commands contain an update flag for updating the track register when this bit is set after the step has been completed 6 6 14 2 Type II...

Страница 200: ...ows you to terminate an operation upon the condition specified in bits 3 0 See Table 6 26 for descriptions of the termination conditions 6 6 1S General Control and Status Register 80H This 8 bit regis...

Страница 201: ...ne second software delay must be observed before accessing the drive When low 0 it means that the interrupt line of the Z80 CPU is asserted low 0 When high 1 no interrupt is pending This bit indicates...

Страница 202: ...s the status of bit 0 in the diagnostic write register 98H I This bit reflects the status of the SRTS line of the communications port as set by bit 6 of the communications control register 2 This bit...

Страница 203: ...L TRMSLl TERMINALBDSELECTl TRMSL2 TERMINAL BD SELECT 2 L COSRTS SECONDARY REQUEST TO SEND L COMMSSSPEED SELECT Figure 6 43 Communications Control Baud Rate Select Register Format Table 6 32 Communica...

Страница 204: ...LE BIT LOOPBACK SYNCHRONOUS COM SEL NOT USED DIAGNOSTIC LED 1 DIAGNOSTIC LED 2 DIAGNOSTIC LED 3 DIAGNOSTIC LED 4 MR 8036 Figure 6 44 Diagnostic Write Register Format Table 6 33 Diagnostic Write Regist...

Страница 205: ...DRIVE 1 SELECT SIGNAL MR 8037 Figure 6 45 Diagnostic Read Register Format Table 6 34 Diagnostic Read Register Bit Description Bits Description o When set 1 this bit informs the formatter controller th...

Страница 206: ...VT100 is issuing an initialize to the VT18X control module This signal is the transmitted data line to the 25 pin D type con nector extending from the terminal controller module This signal is the loc...

Страница 207: ...18X control module This is the received data from the general purpose serial port This is the data terminal ready signal from the 25 pin printer connector This signal is the received data input from t...

Страница 208: ...tor receives its synchronizing drive through inverter buffer Q298 R331 and C314 are a low pass filter on the input for noise immunity The input is ac eoupled so that if the drive stops in either a hig...

Страница 209: ...to Q310 as a result of feed back causes Q3JO to accept the varying current from L301 at the same time that a ramp current through the yoke is ntained 6 8 1 7 iIorizontal Driver The horizontal driver...

Страница 210: ...tores energy YOKE Tl Initial Condition Action 15 C441 TO MR 80113 Figure 6 46 Horizontal Deflection Current TO Start of retrace Figure 6 47 Current out of the yoke is maximum Q414 is switched off C438...

Страница 211: ...flection Current T2 Start of scan left half Figure 6 49 Current into the yoke is maximum C438 is discharged Inductive inertia makes the top of the yoke slightly negative forward bias ing CR406 to prov...

Страница 212: ...ly small so that the voltage drop across its reactance can provide S correction for the horizontal scan This compensates for the difference between the arc of the tube face and the arc of the beam s d...

Страница 213: ...ontrol Circuit The control circuit in the power supply is designed around the 3524 pulse width modulator PWM Ie It houses a voltage reference error amplifier oscillator pulse width modulator pulse ste...

Страница 214: ...of the oscillator is 60 kHz The switching frequency of the power supply is one half that of the oscillator 30 kHz because only one of the single ended outputs is used This output pin 13 a pulse width...

Страница 215: ...winding 5 6 of T3 and transistor Q2 The current through winding 5 6 of T3 makes all dotted ends positive on T3 The negative polarity on the base of Q7 turns it off OIl is across T3 and Q2 for noise im...

Страница 216: ...of E4 goes low the emitter of Q6 is pulled negative with respect to the base which is at ground Q6 saturates pulling pin 2 of E3 down and thereby allowing the ramp generated at pins 6 and 7 by C13 to...

Страница 217: ...installed in video terminal 3 0 A normal blow fuse Single voltage transient without causing system degrada tion 600 V at 2 5 WIs maximum 1000 V at 2 5 WIs maximum 0 5 W maximum Unit operates without...

Страница 218: ...A maximum 12 V at 1 0 A minimum to 2 75 A maximum 12 V at 0 0 A minimum to 0 5 A maximum 23 Vat 10 rnA 5 0 75 2 0 0 1 1000 hrs 0 025 degrees C Ripple Dynamic load regulation Noise 12 V Specifications...

Страница 219: ...cifications apply after a five minute minimum warmup measured at the dc distribu tion buses with an averaging meter 2 Dynamic load regulation is measured in 25 load steps from a starting point of 75 o...

Страница 220: ...h as set up and no scroll Refer to Paragraph 6 5 8 for a discussion of UART principles This section describes the operation of the keyboard and its interface to the hardware and software in the termin...

Страница 221: ...atus Byte The terminal controls the keyboard through a status byte that it sends through the interface along with the keyboard clock The first six bits of the 8 bit byte Figure 6 55 control the on lin...

Страница 222: ...erts data strobe Data strobe loads the UART transmit buffer with the address count present at the data input at that moment That address count represents the key that was down when key down was assert...

Страница 223: ...d m counts to first key n X 160 for n keys down 160 transmission of 7FH Total X 7 945 microseconds For example suppose that one key 24 is down 160 start scan command word to keyboard 24 counts 160 tra...

Страница 224: ...EAK DELETE 4 1 0 L SPACE LINE V RETURN FEED RETURN I p 0 I M I 0 L 8 9 SPACE N J K 1 U Y BAR 6 7 V B H R T G 5 4 C X 0 F E W 2 3 NO I Z S A Q TAB ESC SCROLL 1 SET UP CTRL SHIFT CAPS LOCK ALWAYS CLOSED...

Страница 225: ...NETWORK C7 l R11 R13 10K 20K I L J I t SIGNAL L1NE eot SENDER IRECEIVER 12 IJUNCTION R15 I 470 E8_ 2MK f 2Vi K lL JL i _ OUTPUT I DATA LE CAPACITANCE R7 MR 8D87 Figure 6 58 Keyboard Interface Circuit...

Страница 226: ...eiver Signals Sending End o o 12 12 Receiving End o 12 o 12 Noninverted Input Junction o 6 6 12 Inverted Input 3 9 3 9 Difference 3 3 3 3 Output o o 5 5 Keyboard Cable Compensation C7 compensates the...

Страница 227: ...HESE AVERAGE HIGH II I III OUT OUT 1 DATA AND LBM II DATA AND LBA3 III LBA3 AND LBA4 MA 8095 Figure 6 59 Encoding of Terminal Data and Clock The negative transition of each output pulse occurs at the...

Страница 228: ...pacitor voltage rises or falls past the refer ence value The short duty cycle of zeros averages to a low voltage that holds the comparator output low The long duty cycle of ones averages to a high vol...

Страница 229: ...o E3 As C8 discharges through the speaker and E I E3 clears itself turning E I off Then C8 charges up again until the next data available pulse clocks E3 on again to repeat the discharge cycle C8 disc...

Страница 230: ...e keys sent in the scan If the bit is set the microprocessor clears the new key address buffer and exits If the overflow bit is not set the first key is taken from the new key address buffer and teste...

Страница 231: ...ignores all of them if the count is over three as it is in this case But it is possible for a user to briefly press keys J H and G and then release G before the scan is completed Then the keyboard pr...

Страница 232: ...o priate LED lights When a key is about to be converted to ASCn and stored in the buffer the microproces sor checks the buffer to see if there is room Since any key might produce three bytes of code t...

Страница 233: ...rror characters or error messages displayed on the screen Corrective action may then be taken as directed by the error indication The VTI80 has the following self tests I Power up test 2 CPU test 3 Dy...

Страница 234: ...AL REGISTER FLOPPY ERROR RESTORE FAILURE DRIVE n FLOPPY ERROR STEP FAILURE DRIVE n FLOPPY ERROR INDEX PULSE FAILURE DRIVE n FLOPPY ERROR MOTOR SPEED FAILURE DRIVE n FLOPPY ERROR SEEK FAILURE DRIVE n F...

Страница 235: ...following tests during power up 1 It writes a 1 and a 0 in turn in each bit location of RAM on the basic terminal controller module to verify that the RAM can store each bit 2 It writes a I and a 0 i...

Страница 236: ...t key 3 Press SET UP and 4 placing the VTI80 in local mode Type the following sequence to perform the power up test once ESC 2 ly 4 Place the terminal in local mode Type the following sequence to perf...

Страница 237: ...AL X PRINTER X 0 0 X CONSOLE X X 0 0 0 COMMPORT X 0 X X X FLOPPY ERROR X INTERNAL REGISTER 0 X X 0 FLOPPY ERROR X X RESTORE FAILURE DRIVEn 0 X 0 X FLOPPY ERROR X X STEP FAILURE DRIVEn 0 X 0 0 FLOPPY E...

Страница 238: ...printed on the video terminal VT18Q XX Version n n Copyright 1982 Digital Equipment Corporation PRESS A B C D S or T A Start System drive A B Start System drive B C Start System drive C D Start Syste...

Страница 239: ...d Setting 1 ANSI see note below 1 on must be left on o off o off oor 1 60 Hz or 50 Hz NOTE You can use VTS2 mode in the VT180 but you should not save the VTS2 features Upon power up the VT18X control...

Страница 240: ...eatures The switchpack and jumper locations are shown in Figure 7 1 The com munication switches configuration is described in Table 3 2 and the jumper configuration in Table 7 4 TP1 Eil W100 c 0 R50 D...

Страница 241: ...al Controller Module ROMs The four ROMs used on the terminal controller module for the VT100 are the same as those required for the VT180 Figure 3 6 shows the Digital part numbers of the ROMs and thei...

Страница 242: ...er diagnostics are selected by typing a 1 or a 2 Typing a 3 will display a menu of the individual diagnostics Typing E causes the ROM based Main System menu to be displayed 7 4 1 1 Basic Test Operatio...

Страница 243: ...en P is typed the Diskette Diagnostic menu is displayed again If an error is detected in the basic test the test halts and an error message is displayed Refer to Paragraph 7 4 5 and Table 7 5 for info...

Страница 244: ...te RX180 disk drive or VT18X control module bad Diskette bad RX180 disk drive using unfor matted diskette in disk drive or VT18X control module bad RX180 disk drive or VT18X control module bad VT18X c...

Страница 245: ...BIT 3 RAM FAILURE BIT 4 RAM FAILURE BIT 5 RAM FAILURE BIT 6 RAM FAILURE BIT 7 ADDRESS FAILURE Communications Test Error Messages Error Message INCORRECT VECTOR UNSOLICITED INTERRUPT RTC FAILURE CONSO...

Страница 246: ...ives A and B complete the test without any errors This message is only displayed if the number of disk drives selected was four Install FORMATIED diskettes in C and D drives Type P to proceed with tes...

Страница 247: ...e n I to 9 3 Type P to run the test continuously To stop a continuously running test reset the terminal by pressing SET UP O Boot the diagnostic diskette again to get the menu When the selected test s...

Страница 248: ...selecting an individual test and running it with a repeat count of three The test used in the example is the basic commu nications test The example assumes that the system diagnostic diskette has been...

Страница 249: ...ives The floppy test is run in both the basic and extended tests It also may be run individually with a greater number of operator options This paragraph explains operation of the floppy disk test whe...

Страница 250: ...n and 13 tests The initialization section presents the drive selection dialog and the message to insert formatted diskettes into the selected disk drives If no selection was made and RETURN was typed...

Страница 251: ...ure that the proper errors are detected Forced errors are record not found lost data and CRC error on the data field During the lost data test the write gate is tested to be sure it stays high Test th...

Страница 252: ...d interrupts The basic communications test is run as part of the extended test and can also be run individually When the basic communications test is selected from the Individual Test menu it displays...

Страница 253: ...oopback connector the cable access cover must be removed and any cable connected to the selected port must be disconnected Remember to replace any cables disconnected when the test is complete The Y w...

Страница 254: ...YPE P TO PROCEED L TO LOOP X The X is the echoed response to the message If loop is selected as the response to the message the follow ing message is displayed after 100 loops PERCENTAGE OF ERROR This...

Страница 255: ...ou may start the self test again To boot a diskette type the letter of the drive that has the diskette installed For example to boot a diskette in drive A type A If you want the VTI80 to communicate w...

Страница 256: ...ped the waiting on error message disappears and the following message takes its place LOOPING ON ERROR XXX OF FAILURE The percent of failure is updated every 100 loops 7 5 3 Troubleshooting the VTI80...

Страница 257: ...inal controller the keyboard the monitor the VTl8X control module the VT180 paddle board the RXl80 disk drive unit s or any option added to the VT180 Table 7 6 lists the more common VTl80 failures and...

Страница 258: ...ed in reverse order EMI static from the video termi nal or disk drive failure The disk drive The power cable from the disk drive unit to the terminal is unplugged or the switch is off See Chapter 3 fo...

Страница 259: ...m is powered up or reset but the diagnostic diskette does not run when the drive is specified The terminal displays ROM DISK LOADER FAILURE or DISKETTE BOOT FAILURE The wrong character appears on the...

Страница 260: ...ar the condition with power up or reset Check and replace the terminal controller ROMs if necessary Set the feature to match the computer Set the parity and or parity sense feature Check the settings...

Страница 261: ...acters are displayed as a white area black with reverse screen Only the top or bottom half of the characters are displayed on the screen The set up features do not work correctly multiple alarms may s...

Страница 262: ...ions are met type ESC 8 to fill the screen with a test pattern con sisting of all Es 7 6 1 Alignment Template Figure 7 2 shows the alignment dimensions used in this procedure If the mylar adjustment t...

Страница 263: ...form another rectangle around the previous one 5 Between the two rectangles mark an area in the center of each side to leave for support the black areas in Figure 7 3 With scissors cut out the corner...

Страница 264: ...UP A or B 2 Adjust R109 Figure 7 4 until the display raster is visible then turn R109 in the opposite direc tion until the raster disappears 3 Return the brightness to its usual intensity with the 1k...

Страница 265: ...of the display are covered by the red area of the adjust ment template 2 Adjust the horizontal width coil U03 with a monitor alignment tool 29 23190 7 6 2 5 Center Adjustment Perform the following ste...

Страница 266: ...ction describes the removal and replacement procedures for modules and mechanical assemblies of the VT180 series of terminals Unless otherwise stated each procedure applies to all terminals in the ser...

Страница 267: ...7 7 22 RF SHIELD PARA 7 7 18 KEYBOARD TOP COVER DC PARA 7 7 8 POWER HARNESS PARA 7 7 19 l KEYBOARD PARA 7 7 9 EXPANSION BACKPLANE PARA 7 7 20 KEYBOARD CABLE PARA 7 7 10 SPEAKER pARA 7 7 11 KEYCAPS pA...

Страница 268: ...k drive unit to the other 7 Disconnect the ac line cord that connects one disk drive unit to the other S Lift the top disk drive unit RXISD AB off the bottom disk drive unit RXISD AD NOTE When install...

Страница 269: ...ard cage and disconnect the ribbon cable from the IC connector on the module 3 Remove the chassis ground screw from the paddle board and pull the terminal controller module partially out of the card c...

Страница 270: ...ther to make electrical contact 7 7 6 Advanced Video Option AVO Perform the following steps to remove the advanced video option AYO I Remove the cable access cover and module access cover Paragraph 7...

Страница 271: ...BOTTOM COVER KEYBOARD TOP COVER Figure 7 7 Keyboard Disassembly 7 7 9 Keyboard Perform the following steps to remove the keyboard 1 Remove the keyboard top cover Paragraph 7 7 8 2 Disconnect keyboard...

Страница 272: ...edge of the keyboard cover To install the keyboard speaker perform steps I through 4 in reverse 7 7 12 Keycaps The tools needed to remove and install keycaps are a keycap puller and a pair of needlen...

Страница 273: ...ng er and check that the contacts are separated 6 Find a correct replacement keycap Gently press the keycap straight down onto the plunger until it is completely installed 7 Repeat this procedure for...

Страница 274: ...le access cover and the cable access cover Paragraph 7 7 1 7 7 14 Video Monitor Board Digital or Elston Perform the following steps to remove the video monitor board Digital or Elston 1 Remove the top...

Страница 275: ...for this procedure 5 Disconnect the CRT anode wire from the CRT Refer to Paragraph 7 7 22 2 for this procedure 6 Using a 1 4 inch nutdriver remove the two nuts mounting the flyback transformer to the...

Страница 276: ...power cord is removed After the power supply is out of the terminal make sure the capacitors are completely discharged Short the capacitors with an insulated wire as shown in Figure 7 11 4 Hold the p...

Страница 277: ...h 7 7 2 3 Remove the VT18X control module Paragraph 7 7 3 4 Remove the terminal controller module Paragraph 7 7 4 5 emove the top cover Paragraph 7 7 13 6 move the bottom cover Paragraph 7 7 16 7 t th...

Страница 278: ...emove the cable access cover and module access cover Paragraph 7 7 1 2 Rem ve the disk drive unit s from the terminal Paragraph 7 7 2 3 Remq re the VT18X control module Paragraph 7 7 3 4 Remove the te...

Страница 279: ...able access cover and module access cover Paragraph 7 7 1 2 Remove the disk drive unit s from the terminal Paragraph 7 7 2 3 Remove the VTI8X control module Paragraph 7 7 3 4 Remove the terminal contr...

Страница 280: ...nd InstaUation Perform the following steps to disconnect the CRT anode cap from the CRT 1 Note the position of the anode wire 2 The connector holds itself in place with spring barbs in the anode socke...

Страница 281: ...A PUSH IN THE DIRECTION OF THE ARROW B WHEN ONE BARB IS FREE PUSH IN THE OPPOSITE DIRECTION SEE ARROWS TO REMOVE ANODE CAP o CRT ANODE CAP MR 7062 Figure 7 14 Removing the Anode Cap 7 49...

Страница 282: ...r of the terminal Paragraph 7 7 13 3 Discharge the CRT anode Paragraph 7 7 21 1 4 Disconnect the CRT high voltage anode wire Paragraph 7 7 21 2 5 Disconnect the circular connector from the CRT base Fi...

Страница 283: ...y tool Never touch the glass of a CRT with a hot sol dering tool 7 7 23 3 Storing a CRT All CRTs must be either stored in a closed container or correctly mounted in the product Never store a CRT witho...

Страница 284: ..._ r J J _ I r 1 I I I fI I I _ 1rt J I I I I I I I I I MA 7063 Figure 7 15 Disposing of the CRT 7 52...

Страница 285: ...ANSI has since standardized escape and control sequences in terminals These standards appear in docu ments X3 41 1974 and X3 64 1977 ANSI standards allow the manufacturer flexibility in implementing...

Страница 286: ...s been turned off automatically by the terminal due to a full buffer or by the host through the transmission of an XOFF to the terminal The four remaining LEOs are programmable and can be assigned any...

Страница 287: ...eyclick Margin bell Origin mode Parity Parity sense Power Receive speed Screen Scroll Tabs Transmit speed Wraparound 3 shifted Yes DECKPAM DECKPNM Yes DECANM Yes DECARM No No Yes DECCOLM l No Yes DECC...

Страница 288: ...153 154 155 156 157 160 161 162 163 164 165 166 167 170 171 172 A 2 4 Nonalphabetic Keys Each nonalphabetic key can generate two different codes One code is generated if neither SHIff key is pressed T...

Страница 289: ...8 9 o Neither SHIFT Key Down Octal 061 062 063 064 065 066 067 070 071 060 Upper case orr Either or Both SHIFT Keys Down Octal 041 100 043 044 045 136 046 052 050 051 055 137 075 053 133 173 073 072...

Страница 290: ...ned so that it issues 015 012 octal carriage return line feed The new line feature inset up mode provides this capability A 2 6 NO SCROLL When NO SCROLL is pressed it generates a single XOFF code and...

Страница 291: ...Control Codes Generated Key Pressed with CfRL Key Down Shifted or Unshifted Space Bar A B C D E F G H I J K L M N o p Q R S T U V W Octal Code Transmitted 000 001 002 003 004 005 006 007 010 011 012 0...

Страница 292: ...EseOD A 2 11 Auxiliary Keypad The keys on the auxiliary keypad normally transmit codes for the numerals decimal point minus sign and comma ENTER transmits the same code as RETURN The host cannot tell...

Страница 293: ...SC n ENTER Same as RETURN key P ESC M d PFI ESCP ESCP PF2 ESCQ ESCQ PF3 ESCR ESCR PF4 ESCS ESCS Table A 8 ANSI Mode Auxiliary Keypad Codes Key o 1 2 3 4 5 Numeric Mode o 1 2 3 4 5 Application Mode ESC...

Страница 294: ...r see full duplex protocol Transmit the answerback message Sound the bell tone from keyboard Move the cursor left one character position unless it is at the left margin in which case no action occurs...

Страница 295: ...value is zero or one the active position moves one position to the left If the parameter value is n theactive position moves n positions to the left If an attempt is made to move the cursor to the le...

Страница 296: ...case Es for screen focus and alignment This command is used by Digital manufacturing and Field Service personnel DECANM ANSI VT52 Mode Digital Private This is a private parameter applicable to set mod...

Страница 297: ...lost The cursor remains over the same character position unless it would be to the right of the right margin in which case it is moved to the right margin DECHCP Hard Copy Digital Private Format ESC...

Страница 298: ...Cursor Digital Private Format ESC 8 This sequence causes the previously saved cursor position graphic rendition and character set to be restored DECREPTPARM Report Terminal Parameters Format ESC sol p...

Страница 299: ...s message is a report DECREPTPARM This message is a report and the terminal is only reporting on request No parity is set Parity is set and odd Parity is set and even Eight bits per character Seven bi...

Страница 300: ...ate Format ESC 5 This causes the line that contains the active position to become single width single height The cursor remains on the same character position This is the default condition for all new...

Страница 301: ...ble A IS Erase In Display Parameters Parameter o I 2 Meaning Erase from the active position to the end of the screen inclusive default Erase from start of the screen to the active position inclusive E...

Страница 302: ...de CR The set state causes the LF to imply movement to the first position of the following line and causes the RETURN key to send the two codes CR LF This is the new line NL option This mode does not...

Страница 303: ...VT180 are rendered according to the parameter s until the next occurrence of SGR Table A 18 shows the parameters All other parameter values are ignored Table A IS Select Graphic Rendition Parameters...

Страница 304: ...is 778 the parameters are interpreted as Digital private parameters according to the modes in Table A 21 Any other parameter values are ignored Table A 21 Digital Private Parameter Functions Paramete...

Страница 305: ...ion upward one position without altering the horizontal position If an attempt is made to move the cursor above the top margin the cursor stops at the top margin Cursor Down Format ESC B Move the acti...

Страница 306: ...SC Z This causes the terminal to send its identifier escape sequence to the host The sequence is ESC Z NOTE Information regarding options must be obtained in ANSI mode using the device attributes DA c...

Страница 307: ...C 8 NOTE Pn refers to a decimal parameter expressed as a string of ASCII digits Multiple parameters are sep arated by the semicolon character 0738 If a parameter is omitted or specified to be 0 the de...

Страница 308: ...g Table A 26 lists the erasing sequences Table A 26 Erasing Sequences Erasing Feature From cursor to end of line From beginning of line to cursor Entire line containing cursor From cursor to end of sc...

Страница 309: ...le A 29 Tab Stop Sequences Feature Set tab at current column Clear tab at current column Clear all tabs Sequence ESC H ESC g or ESC 0 g ESC 3 g A 4 1 7 Modes Table A 30 lists the modes and sequences T...

Страница 310: ...terminal ok ESC 3 n terminal not ok A 4 1 8 What Are You This is invoked by ESC c or ES Oc The response is ESC I Psc Ps is the option present parameter with the meanings shown in Table A 31 It is alt...

Страница 311: ...umber computed by taking the weight indicated for each desired test and adding them together See Table A 32 Table A 32 Test Weights Test Power up self test ROM checksum RAM NYR keyboard and AYO if ins...

Страница 312: ...of screen Erase to end of line Direct cursor address Identify Enter alternate keypad mode Exit alternate keypad mode Enter ANSI mode Sequence ESC A ESCB ESCC ESCD ESCF ESCG ESCH ESC I ESC ESCK ESC Ylc...

Страница 313: ...BC26R I0 EIA Communications Cable M F 10 ft 1 BC26U 15 EIA Printer Cable null modem 15 ft 1 70 15765 00 LKOI Keyboard 1 70 14652 Cable Assembly Keyboard 1 12 15050 Speaker 1 12 14333 72 LK07 Keycap Se...

Страница 314: ...00 Shaft Extender 1 29 23190 00 Alignment Tool Monitor 1 29 23187 Kit Carrying Case 1 99 05812 I C Container 1 17 00150 01 Line Cord Coiled 1 17 00150 02 Line Cord Coiled 1 17 00297 BC26K Cable Termin...

Страница 315: ...e line ADDR Address ADDR CNT Address count The signal that drives the address counters in the video processor ADDR CNT ON Address count on The signal inside the ncoI I that controls the output of addr...

Страница 316: ...mand data Caps lock A key that forces alphabetics to uppercase without affecting numeric and symbolic keys CAS Column address strobe Cathode The element that is driven to control intensity of the elec...

Страница 317: ...acters The delete character 1778 is also a control character Control function A special action the terminal can perform to affect recording processing transmitting or interpreting data A control funct...

Страница 318: ...control signals DO Double height DIRC Direction Display The current active area of the screen that is the area inside the scrolling region or the entire screen depending on the origin mode Direct dri...

Страница 319: ...ce A sequence of characters that performs a control function The sequence begins with ESC and ends with the first occurrence of a final character 060 1768 An escape sequence may also have one or more...

Страница 320: ...s the electron beam off during the horizontal retrace interval HORIZ DRIVE Horizontal drive A direct drive signal from the video processor that synchronizes hori zontal deflection in the internal moni...

Страница 321: ...unter If incremented beyond its modulus a counter returns to zero and counts up again MOS Metal oxide semiconductor A class of devices distinct from bipolar MREQ Memory request ms Millisecond Multiple...

Страница 322: ...g that at least one of the bits in a byte changed Parser A process that separates a sequence into its component parts PD Pump down The signal that decreases the frequency of the voltage controlled osc...

Страница 323: ...video A character attribute Characters are seen as dark areas in fields of light Reverse screen A screen attribute The entire screen is normally rendered as black characters on a white background Roll...

Страница 324: ...ontrol Selectiye parameter A string of bit combinations that selects a subfunction from a specified list of sub functions designated by Ps In general a control sequence with more than one selective pa...

Страница 325: ...st machine cycle of an instruction The byte is latched and decoded into control signals by the 8228 system controller Stop bit The last bit in a serial asynchronous byte transmission always a mark STP...

Страница 326: ...tor The address of the first instruction for an interrupt handling routine VERT BLANK Vertical blank The signal that turns off the CRT beam during the vertical interval VERT DRIVE Vertical drive The d...

Страница 327: ...circuits in the disk drive WHO INIT Who initialized A CP M processor signal Wire ANDed TTL devices with open eollector outputs can be tied together to form a logical AND gate at the outputs WRITE LB...

Страница 328: ...d in the manual _ Does this manual satisfy the need you think it was intended to satisfy _ Does it satisfy your needs _ Why _ o Please send me the current copy of the Technical Documentation Catalog w...

Страница 329: ...INESS REPLY MAIL No Postage Necessary if Mailed in the United States FIRST CLASS PERMIT NO 33 MAYNARD MA POSTAGE WILL BE PAID BY ADDRESSEE Digital Equipment Corporation Educational Services Quality As...

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