Tandy 1400LT Service Manual Download

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Summary of Contents for 1400LT

Page 1: ...Num Lock Low Battery Scroll Lock Standby Mode Backlit Supertwist LCD 640 X 200 pixels 80 X 25 characters aspect ratio 1 1 4 Optional RGBI Color Monitor Two internal 720K 3 5 inch double sided double d...

Page 2: ...ble Modem Cable and Memory Cable 2 11 Contrast Knob 2 12 Speaker 2 12 Main PCB Keyboard Shield Plate Rear Panel and Rear Panel Cover 2 13 Pedestals Handle and Bottom Case 2 14 FDD 2 9 PCB BOX 2 10 PAR...

Page 3: ...cuit 12V Output Voltage Circuit EXPANSION BUS Internal MODEM Connection EXPANSION BUS PCB Mechanical Drawing MODEM PCB Mechanical Drawing IV 18 RTC IV 20 POWER Supply IV 21 OPTION PART V TROUBLESHOOTI...

Page 4: ...CB VIEWS 8 1 VIII 1 MAIN PCB Views 8 1 Vlll 2 POWER PCB Views 8 3 Vlll 3 UPPER PCB LED Views 8 4 Vlll 4 SUB PCB Vliews 8 4 Vlll 5 MEMORY PCB Views 8 5 APPENDICES Appendix A LCD SPECIFICATIONS A 1 1 2...

Page 5: ...5 inch FDD MAINTENACE D 1 1 Tools and Measuring Instruments D 1 2 Trouble Shooting D 2 3 Parts Replacement D 8 4 Adjustment D 13 Appendix E CHARACTER CODE TABLE E 1 Appendix F DESCRIPTION OF I O COMM...

Page 6: ...Connector Locations 2 8 Power Switch cord Removal 2 9 FDD Removal 2 9 Exploded View of Power Source Assembly 2 10 Bottom View of Base Frame 2 11 Contrast knob Removal 2 12 Speaker Removal 2 12 Explod...

Page 7: ...face Circuit 4 52 Internal Modem Connector and Peripheral Circuitry 4 52 4 53 EL Output Waveform 4 55 5V Equivalent Circuit 4 57 R C C Ringing Choke Converter 4 58 Power PCB Circuit Diagram 1 4 59 Pow...

Page 8: ...or Cable Connections Mechanical Dimensions Recommended Mounting Direction Mounting Angle Cartridge Loading Allocation of the Track Format Recommended IBM Format Recommended IS0 Format Cat s Eye Patter...

Page 9: ...23 KEYBOARD 2 Internal Keyboard Character Codes 4 25 KEYBOARD 3 Extended Codes 4 28 KEYBOARD 4 Enhanced Keyboard Character Codes 4 31 KEYBOARD 5 Numeric Lock States 4 33 External FDD Connector Pin As...

Page 10: ...r the Tandy 1400LT Section V This section describes how to troubleshoot the Tandy 1400LT Section VI This section provides a parts list and an exploded view of the Tandy 1400LT Section VI1 This section...

Page 11: ...tware selectable after the last keying in the system automatically turns to standby mode In standby mode system indicates a GREEN LED light Boot exchange switch When you use an external disk drive you...

Page 12: ...Figure 1 1 Front View Figure 1 2 Rear View 1 3...

Page 13: ...t boards nents will be shown in these figures Xtal for VFO Xtal for UART DS1 Memory Enable Disable Switch er Bus Controller 71088C Batterv Xtal for Keyboard CPU 256K X 4 Bit DRA I Keyboard CPU Interru...

Page 14: ...T500 DRIVE EL TRANSISTOR TRANSISTOR PULSE WIDTH MODULATION CONTROL CIRCUITS EL DRIVE 5V POWER TRANSISTOR TRANSFORMER TRANSFORMER TR511 T501 T500 1 5...

Page 15: ...Searnent Driver v Segment Driver re RAM S 256K X 4 Bit DRAM Commbn Driver 1 6...

Page 16: ...can be used 1 Super twist nematic LCD panel with EL back light 2 CRT with IRGB input 3 CRT with NTSC not color COMPOSITE input Basically conforms to IBM CGA 16Kbyte 64Kbit type SRAM X 2 Character ROM...

Page 17: ...3V 15V The printer is controlled by the STROBE and BUSY signals When the printer is not busy the CPU receives an interrupt signal IRQ7 Normal commercial printers can be used if they have TTL input Wh...

Page 18: ...o 3 hours 59 minutes in set up mode NOTE 2 In standby mode system indicates a GREEN LED light NOTE 3 In standby mode memory contents will be maintained by main battery over 11 hours at the condition o...

Page 19: ......

Page 20: ...hen disassembling c3 Case Screw I Figure 2 1 Case Screw Removal 2 Turn over the unit to the normal position and lift the Top Cover LCD 3 Peel off two screw seals on both sides and remove the screws Fi...

Page 21: ...op Case Figure 2 3 Top Case L LCD Connector Modem Connector 1 Figure 2 3 Top Case Removal Pull the claws of the Modem connector in the directions of arrows and remove the Modem Cable Figure 2 4 Remove...

Page 22: ...rtion of the Battery Cover to let it disengage with the Top Cover and slide it outward Rear Cover 7 Figure 2 5 Battery Cover and Rear Cover Removal 11 3 LCD Frame Buttons and LCI 1 Turn over the Top C...

Page 23: ...Case Figure 2 7 Top Cover LCD Figure 2 7 Top Cover Removal 3 Turn over the Top Cover and remove two LCD Frame screws on both sides Figure 2 8 4 Remove the LCD Frame then remove two Lock Buttons and t...

Page 24: ...8 Exploded View of LCD Assembly Remove the Cable Cover from the Cable Figure 2 9 Remove four LCD screws and remove the LCD unit and the cushion below NOTE Be careful not to scratch the display surfac...

Page 25: ...gure 2 10 Arm Assembly Removal 11 4 LED PCB and Keyboard 1 Remove four Keyboard screws Figure 2 11 2 Remove the LED Bracket screw 3 Remove the LED connector from the Main PCB and remove the LED unit 4...

Page 26: ...r wires of the Battery Pack Battery Connector Battery Connector PCB Side Figure 2 12 Battery connector Removal 11 6 Base Frame 1 Turn over the Bottom Case peel off two screw seals with tweezers and re...

Page 27: ...move the adhesive tape attaching the Power Switch cords onto the Power Source PCB Cover 4 Remove two FDD cable connectors from the rear of FDD s 5 Remove the following five connectors from the Main PC...

Page 28: ...the Power source PCB then take the Base Frame with FDD s out of the bottom Case Figure 2 16 PIS PCB Box PIS PCB Cover I l l I Terminal Pin Figure 2 16 Power Switch cord Removal 11 7 FDD 1 Turn over th...

Page 29: ...PCB screw and remove the Sub PCB 3 Remove the Sub PCB Pillar with a nutdriver 4 Remove three Power Source PCB screws and remove the Power Source PCB 5 Remove four Power Source PCB Pillars with a nutd...

Page 30: ...emove the Memory Spacer and the Memory PCB Figure 2 19 2 Remove the Expansion Bus Cable and the FDD Cable 3 Remove two Modem connector screws and two Memory connector screws then remove the cables fro...

Page 31: ...ontrast Knob Figure 2 20 Contrast Knob Screw Contrast Knob r Figure 2 20 Contrast Knob Removal 11 11 Speaker 1 Remove the Speaker connector from the Main PCB 2 Remove the hooked speaker from the Botto...

Page 32: ...right and left then take the 5 Remove three Rear Panel screws and remove the Rear Panel 6 Remove eight screws fixing the Main PCB Shield Plate to the D Shell connectors with a 5 mm nutdriver and remo...

Page 33: ...our screw Seals with tweezers Figure 2 23 2 Remove four Pedestal screws and remove the Pedestals 3 Pull off the Handle Pins with pliers and remove the Handle Handle Pedestal Bottom Case 0 Figure 2 23...

Page 34: ...Battery Pack out of the unit 2 Remove the connector and replace the Battery Pack Stuff the cords between the Battery Pack and the Rear Panel so that they do not ride on the Battery Pack Battery Pack...

Page 35: ......

Page 36: ...generate the ppm on the frequency counter If the frequency is can not be guaranteed 5 minutes month LCDC C32 trimmer capacitor t RTC C51 trimmer capacitor 1 Connect the measuring probes of a frequenc...

Page 37: ......

Page 38: ...e Tandy 1400LT Figure 4 1 shows how this section is organized and highlights significant areas General O big aa CPU p F l Specification RAM Control Circuit Interface CPU Interface FDD Interface LCD Un...

Page 39: ...OUSTIC DIRECT 5g1NcH AC COUPLER MODEM RS 232C LPT ENHANCED KEYBOARD A ADAPTER I I SERIAL PARALLEL PORT PORT 7 I F C A 0 SYSTEH BUS I CO CPU BUS DHA INT TIMER P I 0 CPU 7 16 CONTROL CONTROL CONTROL A A...

Page 40: ...NTROL UART FDC VFO 3 5 INCH FDD UNIT NEC V20 Custom IC for dual clock speed 82C37A 5 CMOS 4 Channel DMA controller MAX DMA transmit speed 5MHz 71059C CMOS 8 channel interrupt controller 71088C CMOS bu...

Page 41: ...ustom made IC receives a 14 318MHz input clock and divides it by 2 to produce CPU CLK 7 16MHz High speed MODE and also divides it by 3 to produce CPU CLK 4 77MHz Normal speed MODE The custom made IC a...

Page 42: ...ck Gen 3 shows internal logic block diagram of IC2 DMACLK HLA CHCNG RWT CPUIOREADY 4 1 1 C T L 1 14 318MHz OSCILLATOR 0 SELECTOR f 2 I Figure 4 4 Clock Gen 2 I 14 318 YHz R D Y c C H C N G R E A D Y D...

Page 43: ...hange timing operation 2 RESET timing operation and 3 READY timing operation osc C H C N G I C L K I I I 1 DMACLK P R C L K J I I I I I I L I I 1 I I L I 1 I 1 I 1 NORMAL SPEED 4 H I GH S P E E D I NO...

Page 44: ...are enabled or disabled by DIP switch DS1 CAS2 SIGNAL RAM IC301 IC303 DIP SWITCH SELECT EXPANSION ROM AREA NOT USED VIDEO RAM NOT USED RAM IC301 IC303 RAM IC300 IC302 RAM IC43 IC44 Figure 4 7 Memory M...

Page 45: ...s up DRO DMA Request channel 0 signal And then DMAC IC18 counts up the address for DRAM refresh Column address strobe is generated in GATE Figure 4 11 shows the circuit of 0 active CASO CAS1 and CAS2...

Page 46: ...1 A 3 Y 2 A I C 4 0 7 4 H C 1 5 7 G 7 A L I 28 38 2 Y 48 1 A 3 Y 2A 3 A 4 Y I 1 2 1 IC43 IC300 IC302 A 0 A 0 1 04 i P C A S 0 C A S 1 C A S 2 MREQ m MW 1 A 7 A 7 A 6 A 7 D R A H P i5 00 DO DO 03 03 I...

Page 47: ...6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 EMAO EMA1 EMA2 EMA3 EMA4 EMA5 EMA6 EMA7 DRMAP15 EMDO EMD1 EMD2 EMD3 EMD4 EMD5 EMD6 EMD7 EMR EMW CAS1 CAS2 A18 GND 5v GND 5v Actual address A0...

Page 48: ...and peripheral circuitry BAO Io BAl BA2 BA3 BA4 BA5 BA6 BA7 BA8 25 A8 BA9 24 BAIO 21 BA12 BA13 26 B A I 2 3 1 1 5v GATE2 A0 A i A2 A 3 A4 A5 A6 A 7 A 9 A10 A12 A13 A18 A 1 9 BA14 BA15 BA16 A17 Figure...

Page 49: ...Keyboard Bit 2 Keyboard Bit 3 Keyboard Bit 4 Keyboard Bit 5 Keyboard Bit 6 Keyboard Bit 7 Gate A Timer Chip for Speaker Tone output Enable Speaker Open for other uses Read High switches or Read Low sw...

Page 50: ...L Back Light Control Keyboard Select Switch CRT Controller Disable Not used Low Battery 1 NMI MASK LCD CRT Switch Status FD Power Status LCD Power Status EL Back Light Status Not used Power Save Contr...

Page 51: ...FDC Reset Enable INT DMA Request Drive A Motor ON In use Drive B Motor ON In use Drive C Motor ON In use Drive D Motor ON In use FDC Main Status Register FDC Data Register Tx Buffer DLAB 0 Rx Buffer...

Page 52: ...NTPI 3 INTPi 4 INTP3 5 INTP4 6 INTPE I A 7 7 INTPE BAO CINT m m Ems B IU E m i6 W SA2 GND I C 8 IRQO IRQl IRQ2 IRQ3 IRQ4 IRQ5 IRQ6 IRQ7 Figure 4 16 71059C and Peripheral Circuitry There are three NMI...

Page 53: ...board is controlled by IC50 IC50 is a single chip 8 bit microprocesser containing an 8 bit CPU ROM RAM I O ports and control circuitry IC50 generates strobe signal at every key stroke KP21 Figure 4 18...

Page 54: ...250 V DC 5 Withstand Voltage 250 V AC 1 minute 6 Circuit Make contact 1 circuit Mechanical Specifications 1 Operation Force 35 grf MAX first stage 50 k 150 grf I 200grt p life stage 40 f 15 grf MIN 2...

Page 55: ...Key position No Keyboard Layout for U S A Key Matrix for U S A C1 CZ C3 C4 C5 C6 C7 C8 C9 C10 A C R m Switch Detail Figure 4 20 Keyboard 4 Position Layout and Matrix 4 18...

Page 56: ...Keyboard Layout for U K CN7A CN7B Keyboard Layout for France 1CII CN7A CN70 Keyboard Layout for Italy 1CII CN7A CN78 Figure 4 20 Keyboard 4 Cont 4 19...

Page 57: ...Keyboard Layout for Spain IC11 CN7A CN78 Keyboard Layout for Portugal Keyboard Layout for Belgium IC11 I d 4u z o CN7A CN70 Figure 4 20 Keyboard 4 Cont 4 20...

Page 58: ...Keyboard for Swiss Roman Keyboard Layout for Swiss German _ CN7A CN78 Keyboard Layout for Germany ICI r h 8 CN7A CN78 Figure 4 20 Keyboard 4 Cont 4 21...

Page 59: ...yboard Layout for Finland and Sweden A M am l R m 1 I IC11 CN7A CN7B Keyboard Layout for Norway I d A l i j m I C I IRm CN7A CN7B Keyboard Layout for Denmark I _ i 1 1 i Figure 4 20 Keyboard 4 Cont 4...

Page 60: ...36 37 38 39 40 41 42 43 44 45 46 47 48 01 02 03 04 05 06 07 08 09 OA O B oc OD OE O F 10 11 12 13 14 15 16 17 18 19 1A 1B 1 c 1D 1E 1F 20 21 22 23 24 25 26 27 28 2A 2 c 2D 2E 2F 30 31 32 81 82 83 84...

Page 61: ...3D 3E 3F 40 41 42 43 44 57 58 46 Nothing B3 B4 B5 B6 B8 AB B9 A9 B7 D2 BA C8 C9 D3 C5 CB C7 DO D 1 CD CF BB BC BD BE BF co c 1 c 2 c 3 c 4 D7 D8 C6 Nothing Table 4 4 Keyboard 1 Cont Example Key positi...

Page 62: ...82H 83H 84H 85H 86H 87H 88H 89H 8AH 8BH 8CH 8DH 8EH 8FH 90H 91H 92H 93H 94H 95H 96H 97H 98H 99H 9AH 9BH 9CH 9DH 9EH 9FH AOH A1H A2H A3H A4H A5H A6H A7H A8H A9H AAH ESC 27 1 49 2 50 3 51 4 52 5 53 6 54...

Page 63: ...1 1 1 1 SP 32 BBH BCH BDH BEH BFH COH C1H C2H C3H C4H C5H C6H C7H C8H C9H CAH CBH CCH CDH CEH CFH DOH D1H D2H D3H D7H D8H Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 1 Note 1...

Page 64: ...2 u 117 21 Note 1 17H 97H 5 53 i 105 TAB 9 Note 1 18H 98H 6 54 0 111 15 Note 1 24H A4H 1 49 j 106 LF 10 Note 1 25H A5H 2 50 k 107 11 Note 1 26H A6H 3 51 1 108 12 Note 1 32H B2H 0 48 m 109 CR 13 Note 1...

Page 65: ...Fl F10 CTRL PRTSC Start Stop Echo to Printer CTRL Cursor Left Reverse Word CTRL Cursor Right Advance Word CTRL End Erase EOL CTRL Page Down Erase EOS CTRL Home Clear Screen and Home CTRL Page Up Top...

Page 66: ...ALT CTRL F12 LCD will be valid NOTE To press F11 and F12 keys are not equal to press SHIFT F1 and F2 3 Break The combination of CTRL SCROLL LOCK will result in the keyboard routine signaling interrupt...

Page 67: ...est To Send The External Keyboard then checks the state of the data line If the system is holding the data line low then the External keyboard interface is inhibited The External keyboard shall return...

Page 68: ...H 17H 18H 19H 1AH 1BH 1CH Enter 1DH CTRL 1EH 1FH 20H 21H 22H 23H 24H 25H 26H 27H 28H 29H 2AH SHIFT 2BH 81H 82H 83H 84H 85H 86H 87H 88H 89H 8AH 8BH 8CH 8DH 8EH 8FH 90H 91H 92H 93H 94H 95H 96H 97H 98H 9...

Page 69: ...CH BDH BEH BFH COH C1H C2H C3H C4H C5H C6H D7H D8H z 122 x 120 c 99 v 118 b 98 n 110 m 109 44 46 47 1 42 1 1 SP 32 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 Note 1 1 Note 1 Note 1...

Page 70: ...45 1 1 4CH CCH 5 53 1 1 Note 4DH CuRt CDH 6 54 Note 1 Note 1 Note 4FH End CFH 1 49 Note 1 Note 1 Note 50H CuDn DOH 2 50 Note 1 1 Note 51H PgDn D1H 3 51 Note 1 Note 1 Note 1 52H INS D2H 0 48 Note 1 2 N...

Page 71: ...al Circuitry Block Diagram DMA operation A DMA request DR2 is generated by the FDC IC54 After receiving the DMA request the DMA controller IC18 will issue a Hold request HDA signal to the host CPU The...

Page 72: ...itry BDO I B D 7 A 0 A 1 5 LE OE 0 41 DAN I C 2 0 3 G E BAO B A 7 GATE4 I I C 1 7 I 1 I C 1 9 HDA H L A 8237cs BIR BIw BMW D R 2 DMACLK RDYTODMA BAO B A 7 DATA BUS D D I R BEN HRQ HLDA cs DMAC IC18 m...

Page 73: ...s set the data register contents are sent when it is reset the status register are sent 0 active signals IR IW input allows the transfer of data from to the FDC to from the data bus The FDC is selecte...

Page 74: ...l for the input system is pulled up by the resistor The External FDD 5 25 control signal and input signal for system are terminated by the capacitor BOOT SELECT s w I 8 1 1 3 I N 1 9 9 9 EX1 D E F r b...

Page 75: ...e The VFO removes bit phase shift origination in variations in disk rotation speed or peak shifts from disk drive read data to generate data window and reproduces read data pulse signals for output to...

Page 76: ...External FDD connector pin assignments PIN NUMBER CONTENTS 1 2 3 7 8 9 10 11 12 13 14 15 24 25 26 27 28 32 33 37 16 23 NC NC Ground BSIDESE CDIR WRPRT RDDATA WRDATA WEN NC DSEXT NC INDEX TRKO STEP BM...

Page 77: ...the printer is ready the program activates the IRQ7 indicating printer is not musy to the system program Printer control I O s are 378H 379H and 37AH Figure 4 28 shows timing diagram between CPU and P...

Page 78: ...Systea Po wer on 2 4 81msec Min System Reset 3 2 4 8 msec Min i bi DATA Bit 1 8 BUSY STAB ACR Valid u Figure 4 28 Timing Diagram between CPU and Printer 4 4 1...

Page 79: ...Bus DO D7 IOSEL Chip select signal MEMSEL VRAM chip select signal IOW I O write signal IOR I O read signal MEMRDY Memory request signal and Address Bus A0 A3 serve as the interface between the CPU an...

Page 80: ...te and Read functions are freely executed without checking the status of the display control device This controller will be selected by 0 active MEMSEL VRAM chip select signal and 0 active MEMW MEMORY...

Page 81: ...ching Delay Time Bus Direction Switching Hold Time Read Low Level Delay Time Read High Level Hold Time Read Rise Time PWH tr tf tAS tAH t D W t H W tDS tHR tBD t B H tRD tRH tRr 50 0 0 0 0 10 10 10 ns...

Page 82: ...hite color Low level Black color The shift clock signal of display data The display data UDO UD3 and LDO LD3 is input at the falling edge of this signal Signal for latching 1 line shift register DATA...

Page 83: ...Rise and Fall Times SCK High Level Pulse Width SCK Low Level Pulse Width SCK Cycle Time EWCK Setup Time EWCK Hold Time EWCK High Level Pulse Width M Delay Time tFLS tFLH tLH tLSD tSLD tDSS tDSH tr tf...

Page 84: ...S C i 9 5 9 10P 2 c45 C VIDEO IC30 V6355 LO7 LD6 L O 5 L O 4 FLML L C Figure 4 34 NTSC Composite Interface CNI 74ALS244 r I A l lY1 18 6 1 A 2 I Y 2 l 3 l A 3 l Y 3 l4 4 l A 4 1 Y 4 l2 5 2 A I 2 Y 1...

Page 85: ...rval VSY Pulse Width Blanking Level Black Level Blanking Level SYNC Level Blanking Level White Level Black Level CH Offset Level Burst Side Level Burst Side Level CH Side Maximum CH Side Maximum t H W...

Page 86: ...lse Width t V T W VST VSY Delay Time tTYD VSY VST Delay Time tTYD Video Output Rise Fall Times tr tf 4 1 3 9 3 9 1 5 35 7 1 4 1 3 12 2 63 695 16 688 764 64 196 1019 56 764 5 2 8 4 8 4 2 5 44 7 1 7 1 8...

Page 87: ...rsion on data characters received from RS232C connector or Internal Modem connector and parallel to serial conversion on data characters received from the CPU The CPU can read the complete status of t...

Page 88: ...Percent En or Difference Between Desired and Actual Divisor Used to Generate 16 X Clock Desired Baud Rate SELECTOR Hr B t i M O D m 50 75 110 134 5 150 300 600 1200 1800 2000 2400 3600 4800 7200 9600...

Page 89: ...32C Figure 4 41 shows RS232C interface circuit RTS A T W ZA DTR PA 12v IC47 Figure 4 41 RS232C Interface Circuit Figure 4 42 shows internal modem connector and peripheral circuitry F15R m RXDR RXDM IS...

Page 90: ...rtz oscillator with frequency of 32 768kHz 2 Two capacitors including one trimmer capacitor The accuracy of the oscillation frequency should be measured by using a standard clock signal to be output f...

Page 91: ...e pulse 2 Output from Channel 2 of the timer counter may be programmed to generate a tone pulse 3 PRCLK clock input to timer counter can be modulated with an 1 0 address 61H bit 0 Volume Control The s...

Page 92: ...tries Association EIA drivers for the communications and analog circuits in the main PCB The 15VDC level is used for LCD bias Output control Control 1 5V Control 2 12V 12V 15V High ON Low ON Input Req...

Page 93: ...data Power Save Mode When nothing is input for about 1 239 minutes software selectable after the last keying in the system automatically turns to standby mode Pressing any key will bring the computer...

Page 94: ...where an output voltage is lower than an input voltage This Power Supply circuit operates at an input voltage as low as 8V The operations of the blocks of 5V Power Supply circuit are as follows Block...

Page 95: ...e procedures are repeated The operation of the blocks of 12V Power Supply circuit is as follows Block The Block operates lick a Boot up register Rs in Figure 4 47 The Block is made up of Boot up circu...

Page 96: ...D A T t 0 0 088 00 3 T R i R 4 6U 7 150 s PO 23 86 28 0U 5us LSOO I I CONTROL2 L ON 0 I I _ I 1 I R502 OK I 6 W M27 MWLS Io GND Figure 4 48 Power PCB Circuit Diagram 1 4 59...

Page 97: ...EL LIGHT POWER I GND w This t r a n s i s t o r needs Heatsink No HS501 Figure 4 49 Power PCB Circuit Diagram 2...

Page 98: ...D507 C531 1 Ln 1uF 2 7 EK04 2 r I I 0 5 11 I 0508 D509 I I lSR139 SB34OW2 I I 3 EXT POWER I SUB PCB C I A C U I T DIAGRAM I L I 8 SW500 INPUT FOR DC DC 1 AGND FOR DC DC Figure 4 50 POWER PCB Circuit...

Page 99: ...23 24 25 26 27 28 29 30 N C 5v ENABLE N C N C DACKO IRQ3 N C GND A0 A1 A2 A3 A4 A5 A6 A7 GND A8 A9 A10 A11 A12 A13 A14 A15 GND A16 A17 A18 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50...

Page 100: ...is signal is active LOW 1 0 Write Strobe This signal is active LOW Memory Read Strobe This signal is active LOW Memory Write Strobe This signal is active LOW DMA Requests 1 and 3 These lines are async...

Page 101: ...t informs the MODEM that the UART is ready to communicate DTRM signal is set to HIGH upon a RESET operation DTRM signal is forced to its inactive HIGH during loop mode operation Data Set Ready When th...

Page 102: ...PARTS SIDE W A N S I O N BUS PC8 Mechanical Drawing DWG 1 NOTES SEE O W G 2 FOR HEIGHT LIMITATIONS HOLE PATTERN 2 1 CENTER TERMINALS s TOLERANCE UNLESS SHOWN 0 2...

Page 103: ...PARTS SIDE DWG 2 SOLDER SIDE...

Page 104: ...EXPANSION BUS CARD...

Page 105: ...BUS CONNECTOR COVER STEEL ZINC COATING 1 1 mm 1 1...

Page 106: ...1 SECTION SECTION 0 0 C C BUS COVER 2 0 2 STEEL ZINC COATING 1 1 mm 1 1...

Page 107: ...PARTS I D E CONNECTOR FACES MUST BE FLUSH WITH THIS EDGE C 83 3 5 I LIMITATION 19 8 mm HOOUt PCB Mechanical Drawing SOLDER SIDE TOLERANCE UNLESS SHOWN 0 2...

Page 108: ...BASE FRAME EXAMPLE a MODEM COVER i...

Page 109: ...NOTES 1 THE DIMENSIONS OF THE CONNECTOR MODEM COVER EXAMPLE I BURRING SECTION A A B B STEEL ZINC COATING...

Page 110: ...V TROUBLESHOOTING START 7NO NO I1u RTC Internal FDD 5 1...

Page 111: ...LED Q L START Check again 5 2...

Page 112: ...ower Swi tch SW500 on t h e r i g h t s i d e of u n i t Check t h e Low Battery RED LED when t h e Charge t h e b a t t e r y Check Low p u l s e a v a i l a b l e a t p i n 11 of I C 2 when t h e Po...

Page 113: ...E2 m R O M select s i n n a l C h e c k IC2 IC3 CATEB IC15 and t h e e n t i r e p e r i p h e r a l c i r c u i t r y I f you need t o change ROM IClS p l e a s e p e e l o f f t h e c o p y r i g h...

Page 114: ...ltage t12 12 15V Check input voltage Battery 12V l5V AC adapter 15V 20V YES I Check the battery or AC adapter Check F500 Fuse l Check TR508 orrnal NO b 1 Change F500 I Check output voltage 3 I Check T...

Page 115: ...c xZ rn Check t h e power s u p p l y v o l t a g e a t RAM t5V I Check Pin4 RAS and Pinl7 CAS a t RAM I Check P i n 2 5 of IC18 f o r RAM r e f r e s h 4 b a b o u t l 5 p s e c DACKO signal m Check...

Page 116: ...e l a y l i n e P i n 1 p i n 6 p i n 5 3 0 n s e c 3F 3 0 n s e c Check IC45 and GATE2 40000H 9FFFFH DCOOOH FBFFFH 0 3FFFFH Check IC40 IC42 and entire p e r i p h e r a l c i r c u i t r y I I I 1 1...

Page 117: ...e LCD r e f e r e n c e v o l t a g e A CN2 P i n 1 5 t5v B CN2 Pin17 Min 1 5 V o r m a l A Check TR1 TR2 P i n l 3 1 2 of IC56 and P i n 3 1 of GATE3 B Check TR10 TR11 P i n 3 9 of GATE3 R 1 7 R 1 8...

Page 118: ...i t epaired LCD Unit f a i l u r NO I Check P i n 3 5 7 9 o f IC32 Pin47 50 52 of IC30 Check P i n l 2 1 4 1 6 18 of IC32 Pin69 72 of IC30 I Check t h a t t h e connector i s properly connected Check...

Page 119: ...EL Check Check If CN2 and Check TR15 Base eCheck D10 and Pin40 of GATE3 Check TR14 Collector I I Check TR14 L2 C60 R52 and C61 Replace t h e EL Unit I unit failur Check TR512 and C524 5 10...

Page 120: ...g n a l Pin17 of GATE4 Low I n t e r n a l I NO 1 I Check GATE4 1 I 1 Replace t h e keyboard u n i t YES 1 I Keyboard u n i t I I f a i l u r e I I Keyboard c o n t r o l f a i l u r e Check t h e ke...

Page 121: ...Check t h e keyboard s t r o b e s i g n a l IC50 P i n 2 1 a b o u t Id 120psec Check IC50 Check IC50 GATE4 and t h e e n t i r e p e r i p h e r a l C i r c u i t r y 5 12...

Page 122: ...Buzzer Check D i s t o r t e d wave I i i I and IC39 I Check R55 R57 C67 and C 6 8 I Check P i n 2 9 o f GATE4 l Check TR13 Base P i n 2 of ATE3 5 13...

Page 123: ...tage t5V DC DC C o n v e r t e r c h e c Check t h e n i c k e l cadmium b a t t e r y BATTl I Check t h e o s c i l l a t i o n f r e q u e n c y o f RTC P in3 of IC36 1Hz I n i t i a l f r e q u e n...

Page 124: ...b l e connected t o t h e p r i n t e r CN9 I Check t h e slRB S i g n a l p r i n t e r s t r o b e TR26 C o l l e c t o r Clock Mode 3 3ps ec 4 77MHz x2 2ps e c 7 16MHz I Pin48 55 of GATE2 1 Check G...

Page 125: ...s and c a b l e c o n n e c t e d t o t h e FDD Check t h e power s u p p l y of FDD t 5 V Check FD POWER CON s i g n a l TR16 Base The l e v e l of RESET765 s i g n a l when FDC i s t u r n e d on P...

Page 126: ...A 3 5 signal level measured a t Pin61 of GATE5 must b e Low I L 1 DRIV SELO 3 5 signa l e v e l measured a t Pin63 o f GATE5 must be low YES 1 I Check GATE5 F D Du n i t replacement I I Check t h e co...

Page 127: ...2065 Check p u l s e and fi f o r a low a t RD Pin2 of IC54 Pin3 of IC54 of pPD72065 I Check IC3 signal P i n 8 of Check t h e STEP and DIRECTION signa Pin10 of IC561 I Check IC56 STEPG5 Pin47 of GATE...

Page 128: ...ad d a t a from FDD 1 Check t h e FDD u n i t and t h e c o n n e c t i o n Check DRQ s i g n a l c a b l e P i n 1 4 of IC54 I Is a h i g h signal f e d t o 82C37 IC18 RESET When t h e Main SW i s se...

Page 129: ...Is a low pulse f e d to CS of 82C37 I s a low p u l s e f e d to I O W of 82C37 Pin2 of IC18 5 20...

Page 130: ...GATE3 Check GATE31 Is a low pulse available at CS2 of TC8570P Pin14 of IC35 Is a clock suitable for baud rate gene ration 1 8432MHz 1 Check CTL3 R23 R24 C48 and C49 eck the transmission si I ow leve u...

Page 131: ...data TXD Pin 11 of IC35 1 Check GATE3 and IC47 TXD TXDlBA and TXDlZ signal r 1 Check IC35 GATE3 and IC47 m RTS12A and RTSl2 signal Check SOAINT signal Pin30 of IC35 1 ICheck IC35 1 r I 1 Check the rec...

Page 132: ...I Check IC45 and IC48 RXD12 RXDR and RXD signal I END 5 23...

Page 133: ...Is Monitor switch SW2 ON I 1 Check frequency of CTL2 It must be 21 4772MHz Check Pin1 and Pin19 of IC31 CRTG ENABLE signal Low level is output from Pin30 of CATE3 NO I Check IC31 and GATE3 Check wavef...

Page 134: ...omposite CRT Check Check C42 C43 C45 R l l R 1 3 R79 Check t h e c o n n e c t o r s and c a b l e c on n ect ed t o t h e Monitor Monitor f a i l u r e Check TR3 Check waveform I P i n 5 2 5 4 of 5 2...

Page 135: ...CN16 Iis l o o s e LED z A Change LED3 I C 1 6 and IC50 is l o o s e I 1 Chan e LED4 bheck TR7 Basel Pin46 of GATE3 Check if CN16 Check R64 IC16 and IC50 Check if C N 1 6 is loose Check P i n 5 1 Chan...

Page 136: ...P Check D5 D7 R26 R42 and Pin7 of IC38 LOW BATT2 Under 10 8 11 4V I GATE3 Check B a t t e r y v o l t a g e a t D4 D6 Check v o l t a g e a t P i n 2 6 t5V and 8 t 1 2 of IC38 ICheck IC38 and I 5 21...

Page 137: ...l i z e d Check t h e connectors and c a b l e c on n ec te d t o t h e FDD 0 I I Check t h e l e v e l o f RESET765 signal when FDC i s t u r n e d on P in 5 3 of GATES I t s h o u l d b e Low IES Ch...

Page 138: ...must be High D R I V SELO 5 25 s i g n a l level measured a t Pin62 o f GATE5 must b e High I IFDD u n i t rep1acement l I I C95 C96 C97 R71 R73 Check t h e constant of IC57 are not proper Check f o...

Page 139: ...n37 of IC54 and FDC39 Pin39 of IC54 lof GATE5 I Check IC54 and IC55 1 Check IC 3 Check t h e STEP 5 25 s i g n a l P i n 5 of IC55 1 and DIRECTION 5 25 I s i g n a l i n 3of 1c55j 1 P e rf o rm a WRIT...

Page 140: ...heck t h e FDD u n i t and t h e c o n n e c t i o n I cable I 0 I s a high s i g n a l fe t o 82C37 IC18 RESET When t h e MAIN S W i s set t o ON 0 1 Check IC10 and IC2 Is a clock s i g n a l f e d t...

Page 141: ...I s a low p u l s e f e d t o CS o f 82C37 I Pin11 of IC18 I I s a low p u l s e f e d t o T W of 82C37 Pin2 of IC18 I Check t h e DMA and t h e entire peripheral c i r c u i t r y I END 5 32...

Page 142: ...connector is loose Check the keyboard select signal Pin17 of GATE4 I High External I I Check GATE4 Replace the eyboard contro Check the keyboard data Pin2 of CN2 Check the keyboard CLK Pin1 of CN2 Che...

Page 143: ...VI EXPLODED VIEW and PARTS LIST VI 1 Overall 4 Q 6 2...

Page 144: ...EN C P 0 I I Lu 7 6 6 2rLU LU 0 7 2 E 4 L7 7 5 n U LU 7 7 LU 7 2 D E o 0 0 0 0 0 PO O D 0 0 0 0 0 LU 7 2 U 0 0 LU 7 2 7 4 LU 7 2 LU 7 2 o nLU 7 2 n I o LU 7 2 I O Lu 7 I 0 0 LU 7 2 n LU 7 2 U LU 7 I L...

Page 145: ...LCD Unit Parts Location B 6 4...

Page 146: ...FDD Disassembly Assembly and Parts 6 5...

Page 147: ...6 6...

Page 148: ...FDD Motor Spindle Parts Location 0 sc 01 sc 02 I i 01 6 7...

Page 149: ...FDD PCB Control Parts Location 0 0 0 0 s r r m 0 i 0 0 0 n O O 0 0 0 0 0 6 8...

Page 150: ...Ceramic 0 1pF 12V 80 20 Electrolytic lOpF 16V f 20 Ceramic 0 1pF 12V 1 80 20 Ceramic O OlpF 16V f 20 Ceramic 560pF 50V f 10 Ceramic lOpF 50V t 0 5pF Not used Ceramic lOpF 50V k 0 5pF Ceramic O lpF 25...

Page 151: ...80 20 O OlpF 16V f 20 220pF 50V f 10 2 2pF 25V 80 20 O lpF 12V go 20 20308 332 20308 354 20308 333 20308 352 20308 344 20308 320 20308 352 20308 320 20308 353 20308 352 20308 353 20308 352 20308 323 2...

Page 152: ...ting buffers C MOS D74HC244C Octal buffer C MOS MB83128 128K Bit BIOS ROM MC74HC125 Quad Noninverting buffers C MOS M74HC245P Octal Bus Transceiver C MOS TMP82C37AP 5 DMA Controller C MOS M74HC373P Oc...

Page 153: ...TL D72065C Floppy Disk Controller C MOS M74ALS240AP Octal Inverting buffer TTL M74HC04P HEX Inverter C MOS MC74HC14 HEX Schmitt Trigger Inverter MC74HC365 HEX 3 State buffers With Common Enable C MOS...

Page 154: ...ohm 4 7K ohm 10K ohm Metal 10K ohm 1 5W f 1 2 7K ohm 270K ohm Metal 11 3K ohm 1 5W f 1 4 7K ohm 10K ohm Metal 10K ohm 1 5W k 1 2 7K ohm 270K ohm lOOK ohm POTENTIOMETER lOOK ohm MOW 10K ohm 1K ohm Car...

Page 155: ...5 RA17 10K ohm X 3 RA18 10K ohm X 5 RA19 47K ohm X 8 RA20 4 7K ohm X 5 SWITCHES s w 1 Not used s w 2 s w 3 Switch Slide 2 4 BOOT SELECT Switch Slide 1 2 MONITOR ON OFF TRANSISTORS TR1 DTCl14ES NPN Typ...

Page 156: ...134 20317 141 20317 134 20317 142 20317 134 20315 163 CONNECTOR ASSIES CNl ASSY Not used CN2 ASSY CN3 ASSY Not used CN4 ASSY CN5 ASSY CN 6 9 Not used CNlO ASSY INTERNAL FDD ASSY 2 Pin CN11 ASSY Not u...

Page 157: ...Ceramic O OlpF 50V f 20 Ceramic O lpF 25V 80 20 Electrolytic lpF 50V f 20 Ceramic 0 1pF 25V f 80 20 Electrolytic 2200pF 25V f 20 CONNECTOR ASSIES CN4 ASSY CN17 ASSY CNBATT ASSY DIODES D500 D504 D505 D...

Page 158: ...ohm 560K ohm lOOK ohm 220K ohm 22K ohm 27K ohm 10K ohm Metal 1 82 1 87 1 91 1 96 2 K ohm 1 5W t 1 Metal 4 7K ohm 1 5W f 1 2 7K ohm 3 9K ohm 330K ohm 33 ohm Carbon 47 ohm 1 4W 5 16K ohm 270K ohm Metal...

Page 159: ...Transformer DC DC Convertor T501 CKT 02 Transformer EL Invertor T502 SC 02 06G Transformer Troidal Core TRANSISTORS TR500 TR501 505 TR506 507 TR508 TR509 TR510 TR511 TR512 2SA1315Y PNP Type JC501 NPN...

Page 160: ...r Bipolar IC RESISTORS Unless otherwise specified resistors are 1 5 W rt 5 Carbon type R555 47K ohm R556 R557 220 ohm Metal 4 87K ohm 1 5W t 1 TRANSISTOR TR513 2SB1182P CPT PNP Type WIRE LEAD WIRE RED...

Page 161: ...EMORY PCB MEMORY Ceramic O lpF 12V go 20 Electrolytic 22pF 16V t 20 Ceramic O OlpF 16V k 20 MB81C4256 12P M5M44C256 12 TC514256P10 256 X 4 bit DRAM C MOS TC74HC08P M74HC08P MN74HC08 2 Input And Gate C...

Page 162: ...ED H115 0146 LEDS LED1 LED2 5 _ _ _ _ _ _ _ _ _ _ RESISTORS R76 77 SPEAKER SP1 BATTERY BATT2 AC ADAPTER AC ADAPTER DMS 2845 CZ Speaker 20332 001 10KR 2000C 12V 2200mAH BATTERY MAIN ADAPTER AC120 DC15V...

Page 163: ...LCD RUBBER CONNECTOR EL BACK LIGHT HEAT SEAL ASSY PCB LCD _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ Electrolytic 4 7pF 35V f 20 M5298 Common Driver M5299B Segment Driver HC4040 12 Stage Binary Counter pPC324G...

Page 164: ...0 15pF 25V zk 10 O OlpF 50V f 10 100pF 50V f 10 Tantalum lpF 16V f 10 Tantalum lpF 16V t 20 Ceramic 100pF 50V z k 10 Not used Tantalum lpF 16V f 10 Ceramic 0 15pF 25V f 10 Not used Ceramic 4200pF 50V...

Page 165: ...Silicon DAP202 KT 96 Pot Semi Fixed 30K ohm Curve B Volume For Asymmetry Adjust And Erase Signal Timing Not used Pot Semi Fixed 30K ohm Curve B Volume For Asymmetry Adjust And Erase Signal Timing M52...

Page 166: ...K ohm 1 8W t 1 Metal 430K ohm 10K ohm 1 5K ohm l00K ohm 10K ohm 2 2K ohm l00K ohm 330 ohm 10K ohm l00K ohm 1K ohm 10K ohm 20 ohm 5 6K ohm Not used 5 6K ohm 750K ohm 430K ohm Not used 1K ohm Not used 5...

Page 167: ...Shutter Switch Roller Lever Shutter Switch Spring Lever Shutter Switch Spring Cartridge In _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 6 Spring Plate Slid...

Page 168: ...Chip ERJ 8GCYO ROOV 2A W21 OR00 150m ohm SSNS 01 Assy Sensor Index C66 0300 ssc 01 Screw Sensor Index Pan Head With Spring 042 0220 Washer And Flat Washer M2 0 X 4 Spring Washer And Flat Washer M2 0...

Page 169: ...ck P3 Pin Handle P4 Insulator PCB P5 Shield Plate Main PCB P6 P7 Shield Plate Keyboard P8 Knob Contrast Black P9 Base Frame P10 Shield Plate FDD P11 Box Power Source PCB P12 Pillar Power Source PCB P1...

Page 170: ...M3 0 X 8 Black Screw Tapping M3 0 X 8 Screw Binding M3 0 X 10 Screw Tapping M3 0 X 12 Screw Binding M3 0 X 8 Spring Lock Button Clip Connector Tape Conductive Spacer Memory Cushion Cover Power Source...

Page 171: ...nk Shaft For SpaceKey Top Crank Shaft For Wide Key Tops Crank Shaft For Enter Key Top Spring Guide For Enter Key Spring For Space Key Crank Guide For Wide Key Tops Crank Guide For Space key Tops Cloth...

Page 172: ...T NO MFR S PART NO K90 1 K90 2 K90 3 K90 4 K90 5 K90 6 K90 7 K90 8 K90 9 K90 10 K90 11 K90 12 K90 13 K90 14 K90 15 K90 16 K90 17 K90 18 K90 19 K90 20 K90 21 K90 22 K90 23 K90 24 1 1 1 1 1 1 1 1 1 1 1...

Page 173: ...0 42 K90 43 K90 44 K90 45 K90 46 K90 47 K90 48 K90 49 Key Top m Key Top m Key Top m Key Top m Key Top a Key Top m Key Top m Key Top m Key Top m Key Top m Key Top m Key Top a Key Top m Key Top m Key To...

Page 174: ...K90 66 K90 67 K90 68 K90 69 K90 70 K90 71 K90 72 K90 73 K90 74 Key Top mJ Key Top m Key Top U fl Right Key Top m Key Top 0 See K91 Key TOP Key Top m Key Top m Key Top m Key Top Key TOP m Key TOP Key...

Page 175: ...REF NO DESCRIPTION Q TY RS PART NO MFR S PART NO K90 75 K90 76 Key Top Key Top a 1 1 6 34...

Page 176: ...5 IA6 IA7 IAB IA9 I A l O I A 1 1 IA12 IA13 IA14 IA15 IA16 IA17 IA18 IA19 ILI 2 14 I 2 14 I I I TI I I T I f2 z I RA2 47Kx4 74HC373 5v 3 11 15 17 1 3 11 14 15 17 3 14 15 17 18 3 14 15 17 A iV I I 3 4...

Page 177: ...v I A3 IA4 I A5 IA6 IA7 IA8 IA9 I A I O I A l l IA12 I A 1 3 IA14 IA15 IA16 IA17 I A I 8 IA19 IRQO I R Q1 IRQ2 I R Q 3 IRQ4 IRQ5 IRQ6 IRQ7 1 RST 1 CLK I RST RDY 3 u sT E QSO QS1 TEST F m i K C 1 3 IC1...

Page 178: ...8 11 14 16 17 I 4 5 7 8 11 14 16 17 1 4 5 7 8 11 13 14 17 A7 A6 A5 A4 A3 A2 A I A0 11 l7 I hn 1 A l 1 Y 1 1A2 1Y2 l6 1A3 1 Y 3 i lA4 1Y4 2A1 2Y1 2A2 2Y2 I 5 2 A 3 2Y3 2A4 2Y4 IC13 GND 10 74HC125 9 I I...

Page 179: ...b05 b06 b07 BAO BA1 HR DACK1 10 I4 HDA 1 3 14 16 17 BEN 10 2 IRQO 05 OUT0 06 07 A0 14 m d E 2 m OUT2 1 3 5 8 13 14 15 16 T 2 OUT 17 15 1 1 1 DMACLK 1 3 14 16 17 BEN 2 8 14 15 m 2 8 14 15 m 8 14 BAA 8...

Page 180: ...RD1 RD2 RD3 RD4 RD5 RD6 RD7 5v C30 0 01u 5v ADO mR AD1 AD2 AD3 MEMRDY F I s E T AVdd RDO RD1 RD2 RD3 RD4 RD5 RD6 RD7 5v C31 0 01u 1 V6355 36 35 34 33 32 30 29 28 I LD7 I LD6 I LD5 I LD4 I LO3 I LD2 I...

Page 181: ...244 1A2 1Y2 I 6 1A3 iY3 i 1A4 1Y4 I3 2A2 2Y2 15 2A3 2 Y 3 5 1 A 1 1 Y 1 100K 14 10 13 L IBZ1 A 11 2A1 2Y1 11 1 l7 2A4 2 Y 4 3 A fiV 1R 12 CN17 N C 20 f c 20 Io 341 0 Olu IC33 x 19 13 15 19 9 16 4 VIDE...

Page 182: ...BD1 BD2 BD3 BD4 BD5 BD6 BD7 12 121 12 5uuIH TK A0 A I A2 5u C s 2 4 5 12 14 16 BRST TC 4 4 5 6 7 100K 2 3 RA9 i z r 570P b0 vcc m 30 INT 3 1 32 m 13 34 35 36 37 m RTS SOUT IC35 2s1 cso ITSR m SIN A0...

Page 183: ...s A O DO A l D 1 A 2 D2 A3 D3 15 CKOUT C51 30p ISIOSCIN vCc I 11 12 13 14 t v 5v BDO 1 BD1 1 BD2 1 BD3 15 N C backup power Back 5v 1 4 14 15 DKN 2 4 14 15 2 4 14 15 4 4 14 m E n m m 5v R A l O 47K 4 A...

Page 184: ...2T 1 CON2 2 3 4 5 OTC114ES 3 4 6 15v E C A 15v io 4 7 5 G N D 10K D4 R33 R38 R39 270K tb A 12v t 5v c37 5v b R41 I 4 7K 0 l u 07 2 u i 15 m 152473 270K R45 11 3K 2 7K 06 R40 R44 1 L l 2 IS2473 t v n A...

Page 185: ...C58 e59 IOU 0 lu SP V EL LIGHT 15 R48 C64 SPEAKER CONNECTOR 10K lu II 1 I7 AUDIO BEEP 1K tSP V 7 1 1 C65 T 0 047 IC39 C68 R57 16K I R55 I5 BEEP 0 T II 27k BEEP 15 FD I R 5 12 B U 0 D10 IS2473 100K T...

Page 186: ...3 I I T 5v t RAS CAS C72 q 0 l u 4 4 R58 22HM 7 4 tb 14 R59 22HM 9 12 5v FIR FIR E M A O E M A1 EMA2 EMA3 EMA4 EMA5 EMA6 EMA7 4 1 15 17 18 DRAMPI5 1 1 5v 14 ADL 100SP10 74HC245 1 4 5 14 15 16 17 A2 82...

Page 187: ...os14c00 I I I 17 17 TW DTR I I I I I I I I I I I 4 b 8 m 17 D S U I l o p 9 I19RA 17 Rw 2 I 12 w I I 2 5 9 11 12Nc I IC40 I I 1 I 15 17 RI 214 15 17 WlST IOOK 6 I DcTEfUUL KMBOAUO I I 4 7K CNB 1 KeD C...

Page 188: ...9 EO E l E 2 E 3 E 4 s S I M m WDATA FLTR STEP m sw LCT DIR IC54 UPO72065C W P R T 2 SIDE FLT TRKO RA17 l O K l 3 16 F M TC TC I l6 IESIEX REMY CLK N U IFW RDITA SYNC nrtaon VCC 5 25FDO D E F Icw 0 l...

Page 189: ...D I 7 CPUIOAWY E t i i5 m a 2 s u n 5x17 memo mX j 1 22 B R S T D BRA 4 e ie 1 2 19 I 2 20 4 17 21 4 23 2 4 5 7 12 16 24 H I A 0 BCLK 0 1 2 3 4 5 Q 10 I1 112 1 7 L 6 e I3 14 15 t16 t17 tie t19 t20 t21...

Page 190: ...13 oi 02 03 04 05 06 07 08 09 010 011 012 013 014 015 016 017 ole 019 GATE 3 I O I1 I2 14 En70 s B I x I 7 I4 I3 I 5 K O 1 0 I2 I6 I7 18 EA0 5 2 3 4 E I H O 2 4 4 b 14 4 E 14 SA1 1 12 K D 4 I9 KDtl 11...

Page 191: ...FBI6 FBI7 10 I1 I2 13 14 15 016 16 I20 I7 Ie I9 I10 Ill 00 01 D R I V BEL0 8 25 02 lRmR tNA J BT 03 MOTOR ENA 5 25 OB SCLlR 61 04 N C IN UBE 5 28 07 MI D R I V BEL2 5 25 OB N C I 010 N C DRIV BEL3 5...

Page 192: ...5 11 14 15 16 1 4 5 11 14 15 16 1 4 5 11 14 15 16 1 4 5 11 14 16 1 4 5 11 14 15 16 3 18 3 18 3 3 4 16 1 2 12 14 15 4 2 2 2 4 4 15 1 3 4 14 16 4 15 CD 12 RXD l2 TXD l2 DTR l2 GND DSR l2 RTS l2 CTS l2 R...

Page 193: ...M 256 X 4 B i t 3c 4 1 3 14 15 17 22u u 1C306 74HC08 I I IC302 16c UE a E 5v 3 I I IC303 I 74HC04 74HC04 1 Y IC305 CJ08 I I vcc GND EDL 40 I IC306 1 6 1 5 8 0 01u 4 IC305 0 01u 74HC04 IC305 11 13 GND...

Page 194: ...3 LED Upper PCB Circuit Diagram LED 820 HM 820 HM GREEN LED 1 9 17 GREEN LED1 15 17 RED LED2 12 17 REO LE03 12 17 RED LED4 12 17 RED LE05 LED 3 RED 2 t5v LED 4 RED i u 2 n LED 5 LED I 5 R 76 77 NO 19...

Page 195: ...1 22U 25 0 G N D C 5 0 0 I 470 I I 1504 1IOUH 3A 1 2 R542 5 6K I I R531 2SAl315Y E lu 50v c ZLZ R 27K 520 470U 25 z J510 R525 a IOK 41 1131 15 14 131 12 11 IOTSIT R 522 A3J IC500 R535 4 7K uPC494C R5...

Page 196: ...D510 EK04 47K c531 luF 0 1uF 0 1uF 0 01uF T502 C529 C52G 1 a H 2 C227 GP2OB JACK1 2 PO 513506 i m L 1 i 0 C530 v I c535 I 1OOOpF I I 41 220 M5237L C536 CONTROL1 0 1uF 0 01uF 41 I I I EXT I 47uF 25V I...

Page 197: ...w 0 047uF T501 G N D This t r a n s i s t o r needs Heatsink No HS501 NO 22 7 22...

Page 198: ...VIII PCB VIEWS VIII 1 Main PCB Views Top View 8 1...

Page 199: ...Main PCB Views Bottom View 8 2...

Page 200: ...VIII 2 Power PCB Views Top View Bottom View 8 3...

Page 201: ...VIII 3 UPPER PCB LED Views R77 LED5 LED4 LED3 7 CONNECTOR N0 3 4 Top View Bottom View VIII 4 SUB PCB Views B 1 R 7 R 55 IC5013 ID511 TR513 3 3 2 I C536 SUB PCB c537 H 556 Top View Bottom View 8 4...

Page 202: ...VIII 5 MEMORY PCB Views Top View 4 m U QJ 0 U m W er U m Bottom View 8 5...

Page 203: ...APPENDICES...

Page 204: ...640 X 200 Dot Graphic display 1 100 duty Multiplex drive Electroluminescent EL white NEL SLL 411 W Non Glare I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I...

Page 205: ...ations Item Dimensions Unit 10 63 W X 6 1 H X 0 5 D max 270 X 154 X 12 2 9 76 W X 4 5 H 248 X 114 Module size Effective viewing area inches mm inches mm Weight Approx 0 98 440 Ibs 9 Figure A 2 Dot Dim...

Page 206: ...ircuit Supplyvoltage for LCDdriving Supplyvoltage forELback light Supply frequency for EL back light H level L level Input voltage Current Consumption VDD VSS VDD VEE V E L1 VEL2 f E l VIH VIL ISS IEE...

Page 207: ...4 4 VO adjusting circuit Figure A 3 VO Adjusting Circuit A 4...

Page 208: ...A C signal for LCD driving Start signal of each display cycle Shift register DATA signal of common driver No connection 5V Supply voltage for logic circuit GND Supply voltage for LCD driving Supply v...

Page 209: ...c c c c g O P F 9 0...

Page 210: ...SET UP TIME UDo UD3 LDo LD3 CP LOAD SET UP TIME LOAD CP TIME DATA HOLD TIME CP UDo UD3 LDo LD3 LOAD FRAME TIME FRAME LOAD TIME DUTY 50 FRAME SET UP TIME FRAME LOAD SETUP FR FRAME HOLD TIME t hold FR L...

Page 211: ...LOAD FRAME LOAD DF Figure A 6 Timing Chart 1 8 Figure A 7 Timing Chart A 8...

Page 212: ...than 50000 hour EL back light 200 hour AClOOV 400Hz Life time NOTE Life is a time which luminescent rate reaches to 1 2 or lower against initial luminescent 34 cd m2 on EL circuit s becomes 1 2 times...

Page 213: ...ection Figure A 10 Definition of 4 and 8 NOTE 4 Definition of contrast ratio Non selectedstate Operating voltage for LCD driving Figure A 11 Definition of Contrast Ratio Brightness at non selected sta...

Page 214: ...ts name Standard Manufacturer Option 1 Right angle pin header Straight pin header Option 2 UFP 20A 02 2 YAMAICHI UFS 20A 02 65532 220 BERG 65039 017 UFP 20A 02 4 YAMAICHI UFS 20A 02 66465 220 BERG 650...

Page 215: ...nstalling it Otherwise the device might break or the circuits fail 3 Protect the LCD particularly the surface of polarizer with a transparent plate such acrylic or glass plate on the cabinet 8 3 Opera...

Page 216: ...OFF VOO OFF VEE a Min Om sec b Min 15m sec Figure A 12 Operational Precautions A 13...

Page 217: ......

Page 218: ...ful not to spread the solder over the other components on the PCB It may cause shorted See Fig B 1 E L back light termina I Figure B 1 Unsoldering EL Terminals Bottom View 2 Push and remove EL back li...

Page 219: ...ake sure there are no stain and dust on the replacement EL back light Clean up by soft cotton cloth or soak benzine lightly and wipe it off when you find out the dust on the surface of the EL back lig...

Page 220: ...fore insertion And then insert EL back light over the FPC Be careful to watch the silhouette of EL back light when inserting See Fig B 3 and B 4 If you will insert EL back light like as Fig B 4 a and...

Page 221: ...B 5 LCD metal frame 7 J l5 0 insert E E L back light Figure 8 5 Attaching EL Right Side View 7 Adjust and bend the EL back light terminals to the pad of EL back light terminals positioned at the back...

Page 222: ...rack 409 6 819 2 Formatted Per Disk Transfer Rate Kbit sec 125 250 Access Time msec Average Latency msec 100 100 Track to Track without Settling 6 6 Average with Settling 169 169 Settling Time msec 15...

Page 223: ...ia Life Operating Shipping Storage 5 0 to 45 C 40 to 60 C 20 to 50 20 to 80 1 to 95 1 to 95 85 F 29 4 C no condensation no condensation f 4 4 volt to 5 5 volt 0 7A Max 0 31A typ 0 31A typ 0 85A MAX 0...

Page 224: ...D A T A 4 C I R C U I T W R I T E H E A D W R I T E W R I T E D A T A Fig C 1 shows interface signals for the internal functions of the FDD 0 S T E P 4 D I R E C T I O N D R I V E S E L E C T T R A C...

Page 225: ...rted Drive Mechanism The brushless direct drive motor rotates the spindle at 300 rpm Like conventional 5 25 drives the FDD has a MOTOR ON signal Since almost all of the power of the FDD is turned off...

Page 226: ...lent track positioning accuracy without causing eccentricity or chucking wear See Fig C 2 CENTER HOLE CHUCKING HOLE Figure C 2 Disk Chucking Mechanism Read Write Heads The bulk type ferrite read write...

Page 227: ...D X 5 v 3 5 v WRITE GATE WG GND 3 TRACK 00 TOO 4 GND WRITE PROTECT W P GND 4 DRIVE SELECT0 DSO Spindle Motor Circuit 1 4 4 1 0 41 2 0 41 2 2 SIDE 1 SELECT HS DIRECTION DR GND z 1 2 100KQ FRAME GND 2 6...

Page 228: ...receivers is terminated in lOkR to Vcc D r i v e 0 t vcc lOKn C M O S C o n t r o l l e r D r i v e I C MOS SN7438 06 07 equivalent Input Signals High Level Low Level Input Impedance Output Signals H...

Page 229: ...w DIRECTION This signal determines the direction of R W Heads movement by the following High Level Out towards Track 00 Low Level In towards Track 79 STEP This line causes the R W Heads to move The pe...

Page 230: ...ne provides data to be written on the disk Each transition from High to Low changes the polarity of the R W Head Current and causes a data bit to be written on the disk Figure C 6 illustrates the Writ...

Page 231: ...E 0 5 m s m a y I _ E R A S E C U R R E N T Figure C 7 illustrates the timing for WRITE GATE and WRITE DATA I 1 2 rns max I j D A T A 8ys rnax W R I T E D A T A 8 y s rnax D A T A V A L I D S T E P R...

Page 232: ...s positioned at track 00 Fig C 9 shows the timing for the last STEP pulse and the TRACK 00 signal S T E P T R A C K 00 1 Figure C 9 Track 00 Signal Timing Write Protect A low level on this line indica...

Page 233: ...s Low when all of the following conditions are satisfied 1 The drive is selected 2 A cartridge is correctly loaded 3 Vcc is 4 2V min 4 Two INDEX pulses are generated after the INDEX cycle is fixed The...

Page 234: ...R E A D Y I I I I I S T E P I I I 1 I scc rnox X2 430ms rn n 1 5 rns rnin I 21 m s rnin r I 2 1 m s min W R I T E G A T E I I I I I 1 5ms min I 1 W R I T E D A T A I R E A D D A T A V A L I D 1 All in...

Page 235: ...D L E MOTOR OTHER FUNCTIONAL CHARACTERISTICS Automatic Motor On Off The Spindle Motor starts when both of the following conditions are satisfied a The cartridge is correctly loaded b The MOTOR ON sig...

Page 236: ...FDD has a Vcc detector in itself Figure C 13 shows the operation of Vcc detector W r i t e P o s s i b l e S e e k R e a d I S e e k P o s s i R e a d 3 8 V T Y P m o v i n g Level Figure C 13 Vcc Det...

Page 237: ...wo connectors The first connector CN 1 provides the signal interface and the second connector CN 2 provides the DC power Figure C 14 shows the diagram of cable connections S i g n a l C a b l e T I z...

Page 238: ...R Vcc for Analog circuit Fcc for Analog circuit Vcc for Analog circuit RESERVED RETURN RETURN RETURN RETURN RETURN RETURN RETURN 2 4 6 8 10 12 14 16 18 20 22 24 26 INDEX DRIVE SELECT 0 DRIVE SELECT 1...

Page 239: ...cal dimensions of OPDB 12A are as follows Width Depth Height 4 00 f 0 02 inches 101 6 f 0 5 mm 5 91 f 0 02 inches 150 0 f 0 5 mm 1 00 f 0 02 inches 25 4 f 0 5 mm Figure C 15 shows the dimensions Eject...

Page 240: ...ounted in three ways as shown in Figure C 16 L 0 e 4 30 degrees t C L Figure C 16 Recommended Mounting Direction If the drive is mounted at an angle should not exceed 30 degrees See Figure C 16 30 deg...

Page 241: ...e front bezel See Figure C 15 Figure C 18 Cartridge Loading DRIVE SELECT CONTROLS The Drive Select switch located at the left side of the FDD is used to designate drives 0 up to 1 in a daisy chain app...

Page 242: ...application to take best advantage of the total available bits that can be written on any track Table C 4 Fig C 19 C 20 and Fig C 21 show the typical recommended format IBM FORMAT Tandy FORMAT 128 256...

Page 243: ...D FIELD GAP2 DATAFIELD 6J GAP3 GAP4 SECTOR FORMAT SYNC 8SYNC ID ADDRESS MARK CYLINDER NUMBER DATA HEADNUMBER CRC 6J RECORD NUMBER GAP3 RECORD LENGTH 0CRC GAP2 DATA ADDRESS MARK Figure C 19 Allocation...

Page 244: ...4a GAP DOUBLE GAP4b FF ID FIELD PREAMBLE l SPECIAL DATA WITH MISSING CLOCK CRC X16 X12 X5 1 GAP 11 FF SYNC SYNC 6 00 NG E BYTE 10 DATA 16 6 00 6 FF i i 8 0 4E C INDEX MARK IDADD MARK 1 FErl BmE 10 DA...

Page 245: ...GAP4 GAP1 C H R N ID ADD SYNC MARK BYTE lo 16 6 1 4 DATA 16 FF 00 FE DOUBLE OATA DATA I CRC GAP2 SYNC 1 MARK I 1 2 2 BYTE 32 12 3 1 4 DATA 16 4E 00 A l FE 2 11 6 1 2 FF 00 FB DATA SECTOR DATA GAP3 Not...

Page 246: ...nance a General Tools Screw Driver Set Tweezers b Special Tools FDD TESTER FTS 1 FDD TEST SYSTEM Ex Computer System c Measuring Equipment Oscilloscope Dual Trace 20MHz Universal Counter Standard Disk...

Page 247: ...al noise easily jumps into signal Influence of strong magnetic field Wrong supply voltage 2 2 TYPES OF ERROR ON A SYSTEM LEVEL 2 2 1 Software Error Software errors are caused by Dirty heads Electrical...

Page 248: ...Heads movement is incorrect because electrical noise jumps into signal 2 Heads driving system might be at fault If it is not re readable after recalibration drive might be at fault 2 2 4 Interchange...

Page 249: ...cilloscope l READY indicator lights in about 0 5 seconds after switch is on I The spindle motor stops rotating l READY indicator does not light I The spindle motor starts to rotate immidiately 2 READY...

Page 250: ...ve the heads by one step towards outer track The following timing can be obtained Track 01 puIse Track 00 sensor 5 8msec max 6ms model 1 Azimuth of heads can be obtained on Track 02 TS1 2 Refer to the...

Page 251: ...100psec The shifted position however does not meet the specifi cation 1 Track 00 signal does not meet the specification 1 Azimuth does not meet the specifi cation 1 Time Margin does not meet the speci...

Page 252: ...d be done using test system Check list is shown below 1 Format with the other FDD 2 Do the Read Write test with random seek 3 Ten surfaces should be tested One surface All tracks both sides 4 No error...

Page 253: ...which fasten PCB to the frame c Remove the connectors except Head Cable Connector It is easy for removal to use small screw driver for removal d Move the PCB with care not to apply excessive force to...

Page 254: ...the PCB b Place the PCB on the frame of FDD c Fasten the PCB with two screws 3 2 FRONT PANEL REPLACEMENT 3 2 1 Removal a Remove the PCB Refer to 3 1 1 b Remove the Eject Button c Remove the Front Pane...

Page 255: ...1 2 3 3 CARRIER REPLACEMENT 3 3 1 Removal a Remove the PCB Refer to 3 1 1 b Remove the Front Panel Refer to 3 2 1 c Put a Head Protect Sheet between the heads d Remove the Carrier pushing the Slide P...

Page 256: ...ll the Front Panel Refer to 3 1 2 d Install the PCB Refer to 3 2 2 3 4 SLIDE PLATE REPLACEMENT 3 4 1 Removal a Remove the PCB Refer to 3 1 1 b Remove the Front Panel Refer to 3 2 1 c Remove the Carrie...

Page 257: ...3 4 2 Installation a Install the Slide Plate b Install the two springs c Install the Carrier Refer to 3 3 2 d Install the Front Panel Refer to 3 2 2 e Install the PCB Refer to 3 1 2 D 12...

Page 258: ...hould be more than 0 9 d Fasten the screws for stepping motor e Confirm the head alignment again STEPPING MOTOR Figure D 7 Head Alignment 4 2 Index Alignment a Measure Index Alignment Refer to 2 3 1 8...

Page 259: ......

Page 260: ...00101 o0o00110 OOO00111 o0001o00 m 1 0 0 1 m 1 0 1 0 00001011 00001100 m 1 1 0 1 m 1 1 1 0 m 1 1 1 1 o0o1oooO o001OOol oO010010 oO010011 oO010100 o0010101 o0010110 o0010111 o001lo00 o0011001 o0011010...

Page 261: ...2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3 c 3D o0011110 o0011111 001OOOOO 0 0 1 m 1 001o0010 001o0011 00100100 00100101 00100110 00100111 00101Ooo 00101001 00101010 00101011 00101100 00101101 001011...

Page 262: ...59 5A 5B 5 c 5D 00111110 00111111 0 1 O O O O O O 01000001 0 1 m 1 0 0 1 m 1 1 Olo00100 Olo00101 01o00110 Olo00111 01001o00 01001001 01001010 01001011 01001100 01001101 01001110 01001111 0101oooo 010...

Page 263: ...75 76 77 78 79 7A 7B 7 c 7D 01011110 01011111 011 m 01loo001 01lo0010 01lo0011 01100100 01100101 01100110 01100111 01101o00 01101001 01101010 01101011 01101100 01101101 01101110 01101111 011loo00 011l...

Page 264: ...o00101 loo0011 0 loo00111 lo001o00 lo001001 lo001010 l o 0 0 1 0 1 1 l o 0 0 1 1 0 0 l o 0 0 11 0 1 l o 0 0 11 1 0 lo001111 1001m 1 0 0 1 o 0 0 1 1 0 0 1 0 0 1 0 10010011 1 0 0 1 0 1 0 0 1 0 0 1 0 1 0...

Page 265: ...0101 10100110 10100111 10101Ooo 10101001 10101010 10101011 10101100 10101101 10101110 10101111 101loo00 101lo001 10110010 10110011 10110100 10110101 10110110 10110111 1011lo00 10111001 10111010 101110...

Page 266: ...O O O O O 11OOOOOl 1 1 m 1 0 1 1 m 1 1 11ooo100 11000101 1lo00110 11000111 11001ooo 11001001 11001010 11001011 11001100 11001101 11001110 11001111 11010000 1101oO01 11010010 11010011 11010100 11010101...

Page 267: ...111 11lo0000 111oooo1 11100010 11100011 11100100 11100101 11100110 11100111 11101Ooo 11101001 11101010 11101011 11101100 11101101 11101110 11101111 1 1 1 1 m 11110001 11110010 11110011 11110100 111101...

Page 268: ...Decimal Hex Binary Printed Character Keystrokes 251 FB 11111011 d ALT 251 ALT 252 253 FD 11111101 2 ALT 253 254 FE 11111110 ALT 254 255 FF 11111111 BLANK ALT 255 252 FC 11111100 n E 9...

Page 269: ......

Page 270: ...Extended write selection In case of bit 3 1 DREQ sense active high low DACK sense active high low 6 7 o 1 0 1 09H Request Register 00 01 10 11 Selection of channel 0 Selection of channel 1 Selection...

Page 271: ...f channel 0 Selection of channel 1 Selection of channel 2 Selection of channel 3 Verify transfer Write transfer I O to Memory Read transfer Memory to I O Illegal In case of bit 6 7 11 Auto initialize...

Page 272: ...rupt Scale T 1 I Single Mode 0 Extended Mode I T lNTP Trigger 1 I Level Trigger Mode 0 Edge Trigger Mode I IW2 Initialization Word 2 At5 Aa Higher Byte of Interrupt Routine Address in CALL Mode V7 V3...

Page 273: ...0 SNz SNi SNo A0 Interrupt 1 Di DE D5 D d D3 Dz Di Do Vector Mode Select 0 I Slave Number CALL Mode IW4 Initialization Word 4 4Lode 1 1 1 4 1 Self FI Mode 0 I FI Command Mode r select 1 I 1 I Buffer M...

Page 274: ...D 7 De Ds D 4 D3 DZ Di Do 1 1 1 7 0 No Level Without Rotation Normal FI Command Normal Rotation FI Command Designation With Rotation Without Rotation Specific FI Command No Operation Rotation and MCW...

Page 275: ...RWMO C BCD Binaly or BCD 0 Binary Count 16 Bits 1 I BCD Count 4 Dimid RWMl RWMO Read Wnts Mode Hipher Byte Only Lower Byte then Hipher Select Counter or Multiple Latch Command s c 1 sco 0 0 count 0 0...

Page 276: ...0 42H 1 0 Counter 2 Latch Count Control Register Format for Count Latch Command 1 m m covntsr 0 covntsr I Multiple Latch Command Do not Latch Count Control Regester Format for Multiple Latch Command...

Page 277: ...rd Bit 3 Keyboard Bit 4 Keyboard Bit 5 Keyboard Bit 6 Keyboard Bit 7 Gate A Timer Chip for Speaker Tone Output Enable disable speaker Read High SW or Read Low SW Keyboard buffering SW Keyboard interru...

Page 278: ...ur counter should be as follows when the 12 hour system is selected D1 1 PM D1 0 AM Address allocation of MODE 01 Note 1 Address 1 MODE 1 MODE 01 07EH 07FH 1 A3 A1 I Contents I D3 I D2 I D1 I DO E Tes...

Page 279: ...eading Block 11 in RAM Set 1 to enable alarm output Set 0 to disable alarm output 16Hz lHz clock signals not affected I Set 1 to start clock Set 0 to stop seconds and subsequent counters The leap year...

Page 280: ...A19 4 7 X X 082H DMA Page Register for DMA channel 3 0 1 o Address A16 1 1 0 Address A17 2 1 0 Address A18 3 1 0 Address A19 4 7 X X 083H DMA Page Register for DMA channel 1 0 1 o Address A16 1 1 o A...

Page 281: ...ata Bit 1 2 1 Data Bit 2 1 I Data Bit 3 6 7 4 1 Data Bit 6 1 Data Bit 7 1 379H Printer Status Port ata Bit 4 0 1 2 1 I Data Bit 5 3 4 0 Error 1 Select 1 0 Auto Feed 1 5 I 1 1 P End Out of Paper 2 3 1A...

Page 282: ...0 Bit 1 Selects between 40 X 25 and 80 X 25 alpha mode a 1 sets it to 80 X 25 mode Selects between ALPHA mode and GRAPHICS mode a 0 selects ALPHA modes In graphics mode the resolution is selected by c...

Page 283: ...n This bit indicates the status of the Light Pen Switch or Mouse Switch 0 These switches are not debounced and are not latched When this bit is O the switch which is selected by the expanded mode regi...

Page 284: ...ect 1101001 CON 7 6 5 4 3 2 1 0 Control Data REGISTER BANK SUMMARY All registers are write only register 1 SPRITE The SPRITE is used for the Cursor it can be displayed as a AND EXOR pattern and is a s...

Page 285: ...or of this pattern is selected by the S2 SPRITE COLOR of SPRITE COLOR SELECT register and the background color of this pattern becomes transparent The following indicates the relation of the pattern a...

Page 286: ...his is an 8 bit write only register Its address is hex 65 within the Register Bank The following is a description of the Monitor Control Registers functions Bit 0 l Bit 2 BIT NAME FUNCTION 0 SCRO SELE...

Page 287: ...nal 5 MONO LCD Control Register This is an 8 bit write only register Its address is hex 66 within the Register Bank The following is a description of the MONO LCD Control Register BIT NAME FUNCTION 0...

Page 288: ...specification Bit 7 Bit 6 7 are cleared by the RESET Signal 6 Configuration Mode Register This is an 8 bit write only register Its address is hex 67 within the Register Bank The following is a descrip...

Page 289: ...iming It is possible to latch this data into the outside register and is available to use control signal or data 9 Color Palette The LCDC contains a 16 word by 9 bit palette in the Register Bank which...

Page 290: ...ntensity 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 1 0 0 0 1 1 0 0 0 1 0 0 1 0 0 1 0 0 0 0 1 0 0 1 0 0 1 0 0 0 0 0 0 1 1 0 0 0 0 1 1 0...

Page 291: ...DB D B FDD number 2 is in the seek mode If any of the DnB bits is set FDC will not accept read or write command FDD 2 BUSY DB D B FDD number 3 is in the seek mode If any of the DnB bits is set FDC wi...

Page 292: ...ndicate a drive unit number at interrupt Select 1 Do US Unit Select 0 Pin No Name Function Status Register 1 D EN End of When the FDC tries to access a sector beyond the final sector of a cylinder thi...

Page 293: ...is FFH then this flag is set Do M D Missing When data is read from the medium Address Mark in Data Field if the FDC cannot find a data address mark or deleted data address mark then this flag is set P...

Page 294: ...1 after finishing read write operation on side 0 FDC will automatically start searching for sector 1 on side 1 HUT Head Unload Time MF FM or MFM Mode MT Multitrack Name Function N Number written in a...

Page 295: ...and SOFTWARE RESET commands and 1 for all other commands Instruction Set 2 Instruction Code Phase R W D D D D D D D Do Remarks Read Deleted Data Command W W W W W W W W W MT MF SK 0 1 1 0 0 Command co...

Page 296: ...ader on floppy disk w R w i N w i EOT W GPL w DTL Execution Result R R R R R R R Data transfer between the FDD and main system c STO Status information after command execution i ST1 i ST2 4 C Sector I...

Page 297: ...es Result R STO Status information about the FDC at the end of seek operation R PCN Specify Command W 0 0 0 0 0 0 1 1 Command codes W SRT HUT w HLT ND Sense Drive Status Command W 0 0 0 0 0 1 0 0 Comm...

Page 298: ...n t H 9 i R t N c EOT t GPL c DTL prior to command execution Execution Result R R R R R R R Data transfer between the FDD and main system FDC reads all data fields from index hole to EOT t STO Status...

Page 299: ...0 MF 0 0 1 1 0 1 Command codes W X X X X X HD US US w i N Bytedsector w i sc Sectors track W e GPL Gap3 w D Filter byte Execution Result R i STO Status information after command execution FDC formats...

Page 300: ...Interrupt Ident Register IIR IID1 I IIDO I INTF 3FBH 1 3 Line Control Register LCR DLAB SBRK STCP EPS PEN MODEM Control Register MCR LOOP OUT2 Line Status Register LSR TEMP TDBE BD CTS D4 FE DDCI 3FEH...

Page 301: ...RADIO SHACK A division of Tandy Corporation Fort Worth Texas 76102 3A8 Printed in Japar...

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