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Содержание Horizon

Страница 2: ...er filling out and returning vour Warranty Card If you have purchased your HORIZON as a kit then skim this manual completely once and then carefully follow the instructions in sequence Be sure to read the Assembly Information section even if you are an experienced kit builder If you have purchased an assembled HORIZON be sure to read the Using the Serial Interfaces section for instructions on conn...

Страница 3: ...y Information 14 Figure lA Identification of Components 17 Figure IS Identification of Sheet Metal Parts 18 Power Supply Assembly 19 Table 1 Power Supply Wires 25 Figures IP 2P lC 10 27 Motherboard Assembly 28 Second Serial Interface Option Assembly 34 Parallel I O Interface Option Assembly 36 Disk Drive 1 Power Regulation Assembly 37 Disk Drive 2 Power Regulation and Cable Assembly 38 Chassis Ass...

Страница 4: ...Addressing Using the Serial I O Interfaces using the Parallel I O Interface using he Real Time Clock Motherboard Interrupts HORIZON Grounding V OPERATION AND MAINTENANCE Operation Diskettes Maintenance Troubleshooting Out of Warranty Repair VI APPENDICES 1 Pulse Signal Detection 2 Disk Controller Schematic Drawing 3 Motherboard Schematic Drawing 57 65 66 67 71 72 76 79 79 80 81 81 82 82 82 83 84 8...

Страница 5: ...lieu of all otner warranties expressed or implied and is limited to the repair or replacement of the product No warranty expressed or implied is extended concerning the completeness correctness or suitability of the North Star equipment for any particular application There are no warranties which extend beyond those expressly stated herein LI ITED SOFTWARE WARRANTY The following limited warranty a...

Страница 6: ... power is turned on 7 Carefully observe the prescribed rules for handling the MOS type integrated circuits and any PC board containing these devices The handling procedures are described in the Assembly Information sectior 8 To avoid the possibility of a severe shock do NOT touch the power supply section of the computer whenever the power cord is plugged into an AC outlet SOFTWARE LICENSE The Nort...

Страница 7: ...S 1 1 6 4 2 1 9 9 12 12 HORIZON nameplate serial number plate plastic card guides plastic cable ties cable tie mounting brackets power on LED with leads 8 32 nuts 8 lock washers 6 32x3 8 machine screws 6 lock washers ADDI T IONAL PART FOR BORI ZON l ONLY 1 black plastic face plate ADDITIONAL PARTS cOR HORIZON 0 ONLY 2 7 black plastic face plates North Star HORIZON Computer ...

Страница 8: ...d 3 capacitor clamp 1 3 8 capacitor clam s stud diode mounting bracket 1 4 x5 8 machine screws 1 4 lac k washer s 1 4 nuts 6 32x3 8 machine screws 6 32x7 8 machine screws 6 32xl 2 machine screws 6 32x5 8 machine screw 6 lock washers 6 32 nuts wires see Table 1 for details wire label card adhesive backed rubber feet resE t switch mica washers 10 teflon spacers 10 flat washers lO 32x3 8 machine scre...

Страница 9: ...330 100 1 4 wa tt 5 1 4 watt 5 1 4 watt 5 1 4 watt 5 1 2 watt 1 4 watt 1 4 watt 5 1 4 watt 5 2 watt 2 Watt CAPACITORS 3 3 H 4 2 2uf dipped tantalum 6 8uf dipped tantalum 047uf ceramic disc 470pf ceramic disc R GULATORS 1 1 1 5 volt 7805 or 340t 5 12 volt 78L12 12 vol t 9L12 E SOCKETS 14 9 3 1 14 pin sockets liS pin sockets 20 pin sockets 28 pin sockets MISCELLANEOUS PARTS 1 1 3 9 printed circuit b...

Страница 10: ...ors 1 4 auick connect lugs 3 16 auick connect lugs 6 32x3 8 machine screws 6 lock washers 6 32 nut 4 40x3 8 machine screws 4 lock washers 4 40 nuts WOOD COVER PARTS LIST Vvood cover 6 32xl brass machine screws 6 brass flat washers METAL COVER PARTS LIST metal cover 6 32x3 8 machine screws North Star HORIZON Computer 10 ...

Страница 11: ...att 5 lK resistor 1 2 Watt 560 ohm resistor 1 4 Watt 5 220 ohm resistor 1 4 Watt 5 470pf ceramic disc capacitors 2S pin connector 4 40x3 8 machine screws 4 lock washers 4 40 nuts PARALLEL I O INTERFACE OPTION HRZ PIO PARTS LIST 74LS74 IC 74LS373 IC s 7437 IC 14 pin IC sockets 23 pin IC sockets 14 pin DIP header 2 2K resistor 1 4 Watt 5 330 ohm E3istors 1 4 Watt 5 220 ohm resistors 1 4 Watt 5 15 pi...

Страница 12: ...LLER PARTS 1 5 19 22 1 1 6 2 1 2 2 2 2 printed circuit board 5 x 10 MDS AD 20 pin IC sockets 16 pin IC sockets 14 pin IC sockets 34 pin cable connector header crystal 4MHz IN4148 diodes 5 volt regulators 7805 or 340T 5 12 volt regulator 78L12 heat sinks 61G7B 14 6 32x3 8 machine screws 6 lock washers 6 32 nuts Integrated Circuits 2 1 1 1 2 1 6 3 3 1 4 1 1 74LS00 74 LS0 2 74LS08 74LSll 74LS14 74LS3...

Страница 13: ...m 1 4W 5 2 6 8K ohm 1 4W 5 I 470 ohm 1 4W 5 1 9 1K ohm 1 4W 5 680 ohm 1 4W 5 1 10K ohm 1 4W 5 J 2 2K ohm 1 4W 5 1 13K ohm 1 4W 5 3 3K ohm 1 4W 5 1 15K ohm 1 4W 5 3 6K ohm 1 4W 5 3 27K ohm 1 4W 5 SECOND DISK DRIVE HRZ DRV PARTS LIST included in HORIZON 2 1 disk drive Shugart SA 400 1 34 pin edge connector 1 12 1 2 power cable 1 power plug 4 power plug pins 1 5 volt regulator 7805 or 340t 5 1 12 vol...

Страница 14: ... use acid core solder as this can severely damage a printed circuit board When soldering keep the soldering iron tip on the pad just long enough for the solder to completely flow If the solder does not draw up the wire then more solder is required Do not use so much solder that it overflows the pad If a solidified joint is not shiny it may be a cold solder joint and should be remelted The solderin...

Страница 15: ...he leads as far as possible through the correct hc les in the PC board and spread the leads slightly on the solder so_de of the board to keep the part in place After a group of resistors or capacitors has been inserted then solder the leads OIl the solder side of the board and snip off the excess leads as c_ose to the board as possible Use caution to avoid eye injury flam flying bits of wire Save ...

Страница 16: ...s Place the conductive foam or tube which contains the MOS device onto the PC board before removing the device from the foam or tube Also be sure both hands are touching the foam or tube when the device is removed from the foam or tube Once a MOS device has been installed in a PC board handle the board as little as possible Of course never insert or remove any IC while power is applied to the boar...

Страница 17: ...istor Regulator To nO Transi tor and Regulate To 92 positive 1 lead 1 I Quick Cc nneet LU I Ceramic Disc Capacitor Dipped Myla Capacitor Dipped Mica Capacitor Dipped Tantalum Capacitor In1 egrated Circuit Ie I C Socket DIP Header 17 Figure 1A Identification and orientation of components ...

Страница 18: ...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 18 COver VI Ovntin h g I tacket COver mOUntin at b 9 hole ott0t7l lOp Identificat Ion and Onentat IOn of Sh eet Meta Parts 0 0 0 0 0 0 0 0 0 0 0 0 a c r o 0 0 0 0 0 0 0 0 0 0000000000000 C ...

Страница 19: ...gular switch holes are on your upper right See figure IP Orient the fan so the power connections are on the lower right and the airflow arrow points outward P3 Mount the fuseholder to the outside of the back position and orientation as shown in figure IP side lug away from the fan and fasten with the fuseholder nut Insert the 5 amp fuse into the and twist on the fuseholder cap panel in the Orient ...

Страница 20: ...rew to the 3 diameter capacitor clamp with a lock washer and nut Next mount the clamp to the chassis frame in the location and orientation as shown in figure 2P using three 6 32x3 8 machine screws and lock washers Do not tighten the machine screws yet Next insert the caoacitor into the clamp oriented as shown in figure 2P forcing the bottom of the capacitor to be flush with the frame Finally tight...

Страница 21: ...th a 10 machine screw and lock washer The following order should result from left to right 10 32x3 8 machine screw head lock washer wire end ring terminal and threaded transformer terminal P l Connect end B of wire 12 to terminal 3 of the transformer P 2 Connect end B of wire 11 to terminal 2 of the transformer P 3 Connect end A of wire 9 to terminal 1 of the transformer If necessary bend the tran...

Страница 22: ... end A of wire 24 and end A of Wlre 25 Route the unattached end of wire 25 toward the rear of the chassis P31 Connect the following two wires to the lug of the capacitor end B of wire 24 and end B of wire 23 end A of wire 23 onto the transformer lug 6 8 900uf Slip P32 Connect the following two wires to the lug of the 8 900uf capaci tor end B of wire 22 and end A of wire 27 Route the unattached end...

Страница 23: ...pressed Next plug the line cord into the line filter and an AC electrical outlet Now turn on the power switch The fan should turn on and blow air toward the outside of the chassis P43 The following DC voltages should now be read with a voltmeter at the ends of the unattached wires A 11 volts DC 15 between all four possible pairs of one of the two red wires and one of the two black wires from the 1...

Страница 24: ...e screws and lock washers such that the following order results from back to front machine screw head lock washer back panel and chassis frame Leave the machine screws loose for now They will be tightened during chassis assembly Route the power supply wires so they will not interfere with the free rotation of the fan The seven unattached power supply wires should be routed over the back panel to t...

Страница 25: ... 5 6 ring line filter center chassis 2 wh i te 16 7 line f i 1 te r rig ht 1 4 FISO power switch 1 ug 2 3 black 16 3 1 2 line f i 1 te r rig ht 3 16 FISO fuseholder center lug 4 blac k 16 6 3 16 FISO 1 4 FISO fuseholder side power switch 1 ug 5 5 black 16 9 3 16 FISO 1 4 FISO transformer 8 power switch 1 ug 6 6 white 16 9 3 16 FISO 1 4 FISO transformer 9 power switch lug 3 7 black 16 8 1 2 3 16 FI...

Страница 26: ... wh i te 12 2 3 4 1 4 SO 1 4 SO bridge AC lug transformer 7 21 orange 12 8 1 4 1 4 SO 10 ring bridge lug 11 000uf 1 ug 22 yellow 12 6 1 2 1 4 SO 10 ring bridge 1 ug 8 900uf 1 ug 23 black 12 8 1 4 1 4 SO 10 ring transformer 6 8 900uf lug 24 black 12 2 1 4 10 ring 10 ring l1 000uf lug 8 900uf lug 25 black 12 20 1 4 10 ring 1 4 SO l1 000uf lug motherboard GNU 26 orange 12 20 1 4 10 ring 1 4 SO 11 000...

Страница 27: ...lder Connector Hole Side Tab lilO ooOuf Cap Lug II r ri ge c tier ug FIgure 1P View of Inside of Back Panel after Assembly Step P1 1 Figure 2P Top View of Power Supply after Assembly Step P25 1 2 Gnd Gnd 5 White Figure 2C Ribbon Cable Folding 27 Figure 1D Disk Power Plug Wiring ...

Страница 28: ...s given in the Assembly Information section M4 Insert and 301der the three 20 pin IC sockets at locations SA 6A and 7A MS Insert and solder the nine 16 pin IC sockets at locations lA 2D 3D 6D 7D 8B 9B 9D and 10B M6 Insert and solder the fourteen 14 pin IC sockets at locations 2A 2B 3B 3C 5B 5 5D 6B 6C 7B 7C 8D 10A and 100 NOTE If the parallel I O interface option or second serial interface option ...

Страница 29: ...mation section Resistor Loca tion Value Size Color code Rl 58 2 2K 1 4W red red red R2 68 1 2K 1 4W brn red red R3 6C 1 2K 1 4W brn red red R4 10A 1 2K 1 4W brn red red Rll 3C 4 7K 1 4W yel vio red R14 38 5 6K 1 4W grn blu red R15 10 lK 1 21 brn blk red R16 next to Rl7 560 1 4W qrn blu brn Rl7 10 220 1 4W red red brn R30 5B 2 2K 1 4W red red red R31 Front 330 2W org org brn R32 Front 330 2W org or...

Страница 30: ...ion as the heat sirk mounting posts Next install the regulator heat sink ascembly oriented as shown on the layout legend into the locction for the rear most 7805 regulator at the left rear of the motherboard Insert the regulator leads into the motrerboard and then insert the heat sink mounting posts Now solder the regulator leads M14 Insert end solder the 78L12 and 79L12 regulators in the positior...

Страница 31: ...ec to the rno 0001 1f c i 1 000u 180 00 f RES outlet vol es ca i r Vol e Hl 5V DC S l2V DC 5 1 S capacitor should be meas r ter Now turn off the or c itors to disc disconnect the seven ard ick connect lugs ate caus ...

Страница 32: ... 12 2 to 16 3 to 15 to 14 5 to 1 7 to 8 9 to 10 North Star HORIZON none of the jumper res er into location 3D w f current 100 or mod the Osing Ser a ard Interr ts section ter inal communicat lows 74LS136 74LS136 74LS161 74LS241 74LS03 74LS14 74LS161 74 fJS2 74LS132 74 LS138 74LS139 D 74LS74 r er term ina faces section for M2 9 M22 ...

Страница 33: ...rial vrar j r Also j r er Plug a te ll1 nnector usinJ r 1 Interface ed to the mother ar nor ly be HIGH key is depressed k y on th nterf e echoing to Now turn off the ck 31 If th i M 19 t uration rt will be for the st ader one 2 to A so if the sta of the left ard HH tr one 04 ar gr u ZON Com ...

Страница 34: ...AS SL U U RFACE Op rI a ut io 0 1 ing ig hn ue de RIAL I f you have not purchased r r HORIZON u 13 a 4 7K 5 6K lK 560 220 ti 48 II h 4 0 n h t n tj1 t egend a h in the m u u ...

Страница 35: ...n s desir on e t the Se al ese jumper wires t location 4D with nt 0 or em U i e Serial I serve MOS on the s llowing itional c tion 2D connect Ass ly Informat ru tio proced res Serial in e 1 ion ass serial i lowing pa s re st rand I mml1 ni ation con tr k washers owi e IC s No at u U ...

Страница 36: ...e is connected ien drive rg r brn R9 o 0 mi iz 1 Similarly inst n nd R7 330 min iz line if necessar aIle Interface Dar llel rt Der eral I 4LS373 43 4LS 7 4LS74 Nor if you have not purcl1Q CU I the S I sockets he ard as fol ows 1 r a 10A IS Din pa all e mo er ar u t from to bottom v c t motherboard c ...

Страница 37: ... e r boa r d I fro m into the omDonent C9 047 ceramic d sk c e heat s k area e as fo of outer llctor r ca llctor at both e s r power Olllg pins to F naIl nsert th th co r code e not our as dis dr e H SACK POWER REGULATION ASSEMBLY I ns h o o ...

Страница 38: ... heat sink so th inside 6 lator lac ld i t in the 5 sts Next inst i cati rna er DO ts Now sol ta HORIZON i cuitr for the d k ut 7812 12 vol frontmost lac at rna erboard am to bottom 6 heat sink mother two leads tr one possi e ri nta e rnotherbo r If oro em VE POWER REGULATION AND a d ...

Страница 39: ... same way as the already the second f th seco conne top piece rrect s e 0 tb at exactly right on the ribbon bi Now ins rt the t connec se 0 carefu 1 finished ther Dlastic r and ribbon cabl figurat sec n to configure each rive c e assembly to ur wires ugh the e motherboard from e four wires into s from comDonent s s m 1 E ...

Страница 40: ...with two 6 32x3 iece in twelve front Wires out under the t on piece At anel with two 6 3 carefull the r te s in th chassis rt int the hole st ll ds th fr be d or stri cover mounti brac ts assis frame at two 32x 8 ine S C bracket Orient e ch is at the bottom e hassis sheet metal iec nuts until all piec s rtition niece ing acket to der results from bottom lock washer disk drive rna t s Wh ...

Страница 41: ...black ace plate then it may have to be adjusted later when the disk drive is installed C14 Slip e ld i3 of wire 28 blue onto the motherboard guick connect lug labeled RESET Slip end B of wire 2 q black onto t le lug labeled GND directly in front of the RESET lug C15 Attach the two adhesive backed cable tie mounts to the back panel and chassis partition piece as shown in figure lC orient them so th...

Страница 42: ...ication is required Otherwise if your system includes two or three disk drives then each drive must be configured for unit selection and cable termination See the DiSk Drive Configuration section for details C25 fold the ribbon cable as shown in figure 2C C26 If your HORIZON has one or two disk drives install them as follows Orient the disk drive s so that the power connector is up and insert thro...

Страница 43: ...le face plate into position to the left of the disk drive Note that the face plate should be oriented so that the longer snaps are towards the bottom ThE chassis is now assembled 43 North Star HORIZON Computer ...

Страница 44: ... __ 1 Figure le Top View of Assembled HORIZON l North Star HORIZON Computer 44 ...

Страница 45: ...e bootstrap PROM starting address on reset and power on RAM BOARD ASSEMBLY Ycu now have assembled and checked out your HORIZON mainframe and processor board Now refer to the separate instruction manual fc r the North Star 16K RAM board When you have completed those instructions return to the next section of this manual Note that if you will be using memory other than the North Star RAM 16 A you mu...

Страница 46: ...Color code Rl lA 3 3K 1 4W org org red R2 IB 3 3 1 4W org org gld R3 IB 5 6K 1 4W grn blu red R4 2A 17K 1 4W red vio org R5 2A 27K 1 4W red vio org R6 2B 5 6K 1 4W grn blu red R7 2B 6 19K 1 1 4W blu brn wht brn R8 2B 2 2K 1 4W red red red R9 3A 470 1 4W yel vio brn R10 3A 470 1 4W yel vio brn Rll 3A 5 6K 1 4W grn blu red R12 3A 3 6K 1 4W org blu red R13 3C 6 8K 1 4W blu gry red R14 3C 13K 1 4W brn...

Страница 47: ...ed mica C9 lC 022uf 223 dipped mylar C10 2A gluf 103 dipped mylar Cll 2B 330pf 33l 1 dipped mica C12 3C 200pf 201 dipped mica C13 3B 022uf 223 dipped mylar C14 3B 200pf 201 dipped mica CIS 4A 330pf 33l 1 dipped mic3 C16 SA 022uf 223 dipped mylar C17 5D 3300f 33l ceramic disc C18 5D 47pf ceramic disc Cl9 lIB 100pf 101 ceramic disc C20 l5A 33pf dipped mica C2l l5A 470pf 471 dipped mica The remaining...

Страница 48: ... it is not generally needed Don t tighten the machine screw too tight or you will crack the PC board F9 Install the 12 volt 78L12 regulator Q3 near location 28 orienting the regulator so that the flat edge corresponds to the flat edge indicated on the layout legend FlO Install and solder the 34 pin cable connector header J2 The right angle bent pins should be inserted into the PC board and the str...

Страница 49: ...ree PROM s can be identified as follows Layout Name DWE DSEL DPG l Location 4C llC 9D PROM Type 6301 6301 6309 PROM Label DWE y DSEL xx y DPGM xx y xx two high order HEX digits of PROM origin y version number The labels on the PROM s for the standard version 1 are DWE l DSEL E8 1 and DPGM EB l FI Install the jumper G below location 5D by soldering with a piece of resistor snipping The disk control...

Страница 50: ...econds appearing every 25 microseconds would be described as 120ns 25us See Appendix 1 for details on how to detect pulse signals If an oscilloscope will be used to test the board a scope ground may be installed by soldering a bridge of jumper wire between the two PC board holes that connect edge connector pins 50 and 100 near location l2D Note that either of the two regulator machine screws can a...

Страница 51: ...sed with a rubber band 3IGNAL LOCATION DESCRIPTION I R SHIFT 60 pin 6 AC Ius Bus D WSR 60 pln 15 AC Bus 64u s I S7 50 pin 13 AC 96us 32ms 1 e mostly HIGH I S10 5C pin 15 AC 96us 32ms 1 e mostly HIGH I RITE PULSE 3C pln 5 AC approx 600 700ns 4us no name 3C pin 13 AC approx 600 700ns 4us EAD DATA 148 pln 12 AC approx 500 700ns 4us If the signals are not as listed then refer to the schematic lrawings...

Страница 52: ...quency adjustment occurs The resultant DC level should remain until the next WINDOW pulse Note 2 The two op amp LF356 inputs are very high impedance and attempts to observe them with a scope probe can affect the circuit A Remove the 74LS74 IC at location 4D lift pin 9 of the IC and re insert the IC so that pin 9 is not inserted in the IC socket Then with the computer reset switch depressed check o...

Страница 53: ...controller interrupt logic is to be used then refer to the Disk Controller Theory of Operation and Configuration Options sections forjetails 53 North Star HORIZON Computer ...

Страница 54: ...then proceed to step 13 Otherwise if the motor s do not turn on continue this step as follows A Depress and release the reset switch If the motor s still do not turn on then proceed to part B If the motor s now turn on then check the power sequencing circuitry on the motherboard and the processor board Proceed to step 13 after locating and correcting the problem B Momentarily ground 12B pin 3 on t...

Страница 55: ...ROM The S 100 address bus A0 A15 see the ZPB Manual Appendix 2 for bus pin numbers should contain E800H If this is not so then the problem is with the auto jump circuitry on the processor board The S 100 data input bus DI0 DI7 see the ZPB Manual Appendix 2 for pin numbers should contain 0EH which is the first instruction byte in the PROM If this is not so then the problem is with the PROM circuitr...

Страница 56: ...ap program loads the DOS but communication with the terminal is not established If the DOS gets as far as the terminal I O input routine then pulses will be seen on pin 46 SINP of the bus every three instructions If you detect these pulses then the problem is with the terminal or the serial I O interface circuitry Otherwise if these pulses are not observed then the situation is more complicated an...

Страница 57: ...ermined by the outputs of the board select PROM 2 Write Data Logic If the controller is issued a write data byte command then the low order eight address bits are interpreted as data to write and are gated into the write shift register 6D The controller will place the CPU in a wait state until the shift register is empty and only then clock the new data into the shift register write encoding using...

Страница 58: ...Board Select Control Logic Status from Disk 8 Multiplexor Status Bits 8 8 bit shift register Data Encoder Data to Disk Data Separator Data from Disk Data In Bus to processor 8 8 bit shift register Figure 1T_ Disk Controller Block Diagram North Star HORIZON Computer 58 ...

Страница 59: ...nal After locking to the incoming data is achieved the hunt enable HE signal causes he search for a sync character to begin When a sync character is detected the controller enters body mode When the software issues a read command to the controller the controller will put the CPU into the wait state until the read 3hift register is full 7 ommand Decode Logic When a command address is issued to the ...

Страница 60: ..._ __ _ _ __ i _ _ _ _ i __ __ __ __ __ i __ i __ A _ _ i __ __ Read byte from the 256 bytes of PROM Write byte of data BS 1 Data _ Write a byte of data to register is not empty byte to be written the disk Wait if the write shift The low order 8 bits specify the CASE 2 Controller Orders BS 2 IDOISSIOP STI OS __ __ __ __ __ __ __ __ __ __ i __ __ i __ __ i __ __ Load 8 bit order register from low or...

Страница 61: ...ed 4 drive 3 selected B drive 4 selected CASE 3 Controller Commands BS 3 DM CC 61 _ _ Perform a disk controller command The commands are specified by the B low order address bits DM The DM field controls what gets mUltiplexed onto the DI bus during the command l A status 2 B status 3 C status 4 Read data may enter wait state CC Command code 0 no operation l reset sector flag 2 disarm interrupt 3 a...

Страница 62: ...ble Density Indicator true if data being read is encoded in double density MO Motor On true while motor s are on WI Window true during 96 microsecond window at beginning of sector RE Read Enable true while phase locked loop is enabled BD Body set when sync character is detected WR Write true during valid write operation SP Spare reserved for future use WP write Protect true while the diskette inst...

Страница 63: ...512 byte blocks of data between a specified area on the disk and a specified area of the RAM The algorithm now described accomplishes this task The program to perform this algorithm resides in the DOS 1 Start the drive motor s if they were off and wait for the motor to get up to speed 2 If the disk drive to be selected is different than the drive currently selected or if the motor s were off then ...

Страница 64: ...nd repeat from steD a otherwise done 7 If verify case then all is the same as the read case except that in step c data bytes read from the disk should be compared for equality with the data in RAM Report an error if corresponding bytes do not compare DISK CONTROLLER INTERRUPTS The software provided with the disk system is not interrupt driven The controller can cause an interrupt on anyone of the ...

Страница 65: ...RST JUMPER SECONO JUMPER 3 2 seconds Connect 0 to 3 Connect 2 to 1 6 4 seconds Connect C to 3 Connect 2 to 1 9 6 seconds Connect C to 2 Connect 0 to 1 12 8 seconds Connect B to 3 Connect 2 to 1 16 0 seconds Connect B to 2 Connect 0 to 1 19 2 seconds Connect B to 2 Connect C to 1 25 6 seconds Connect A to 3 Connect 2 to 1 28 8 seconds Connect A to 2 Connect 0 to 1 32 0 seconds Connect A to 2 Connec...

Страница 66: ...ve number One drive must be number one To program a drive as drive number 4 perform the following instructions on the printed circuit board mounted on top of the disk drive a Solder a jumper wire between pin 34 of edge connector Jl and location IF pin 6 Take great care to connect the wire to the very tip of pin 34 so that the ribbon cable connector can slip as far onto Jl as possible b Solder a ju...

Страница 67: ...ignals SINP SOUT SWO and PDBIN are used to direct data flow to and from the internal bus peripheral interfaces and the S 100 backplane lines The power on clear POC signal is used to reset all logic on the motherboard to a known state when the computer is reset or when power is turned on 3 Serial Interfaces The HORIZON motherboard includes two serial I O interfaces One comes standard with the HORIZ...

Страница 68: ...aced to the internal data bus by octal latches Ie type 74LS373 at locations 9A input and 8A output These are gated to and from the internal bus by signals PI to U and LD PO respectively Configuration of the Parallel Port Control header at location 9C allows specification of the conditions which enable the data output latch load the data input latch clock the input and output control flip flops P O...

Страница 69: ... clocks are expressed sixteen times the desired baud rates since this is what the USARTs generally require 8 Real Time Clock The real time cloc feature allows generation of a signal to the processor at regular intervals The clock intervals are divided down from a tap on the baud rate generator by the MOS 14 bit counter at 10B a type 4020 IC A total of 12 intervals from 3 328 ms to 27 263 seconds a...

Страница 70: ...dard Cf bit carrier detect Inhibit standard CF bit Allow second Cf bit Inhibit second CF bit Disarm second transmitter ready interrupt Arm second transmitter ready interrupt Disarm second transmitter empty interrupt Arm second transmitter empty interrupt Reset parallel output flag Reset parallel input flag Disarm clock interrupt Reset clock flag Arm clock interrupt MOTHERBOARD STATUS BYTE The stat...

Страница 71: ...address bit that should match a one should be connected to pin 1 of the header and each address bit that should match a zero should be connected to pin 7 For example if ports AR AF are desired then A3 A should be 10101 rhus pin 7 should be connected to pins 10 and 12 and pin 1 should be connected to pins 9 11 and 13 Within a block of eight I O ports address bits A0 A2 are decoded as follows 71 A0 ...

Страница 72: ... 232 terminal jumper the 16 pin header at location 3D for the standard serial interface 4D for the second Serial interface as follows Connect pin 1 to pln 1 2 Connect pin 2 to pin 16 Connect pin 3 to pln 15 Connect pln 4 to pin 14 Connect pln 5 to pln 11 Connect pin 7 to pin 8 Connect pin 9 to pin l A full 25 conductor cable must be used to connect the terminal to the serial interface connector Al...

Страница 73: ...eader with the E lead connected to pin 7 the B lead connected to pin 5 and the C lead connected to pin 6 b Connect a 5 6K ohm 1 4 Watt resistor green blue red between pins 4 and 12 on the header c Connect a lK ohm 1 4 Watt resistor brown black red between pins 8 and 14 on the header d Remove the 1488 at location 3B Standard 4B Second and replace it with the header just built e Take a 16 pin DIP he...

Страница 74: ... Signal Ground Carrier Detect 12 volts 12 volts No Connection No Connection No Connection No Connec tion Transmit Clock No Connection Receive Clock No Connection No Connection Data Terminal Ready No Connection No Connection No Connection Transmit Clock No Connection T to M M to T T to M M to T M to T M to T used in used in M to T M to T T to M T to M AA BA BB CA CB CC AB CF current loop current lo...

Страница 75: ...ecial Clock connection The transmit and receive clocks for a serial interface are generally connected to the same baud rate However serial input and output can be configured to occur at two different rates NotE that for asynchronous communication the USARTs are generally procrrammed to use a clock at sixteen times the desired baud rate Sync hronous communication generally uses a clock the same as ...

Страница 76: ...ata Bit 7 Data Bit 5 Ground Data Bit 2 Data Bit 0 Input Strobe P I FLAG SPARE extra programable condition Data Bit 6 Data Bit 4 Data Bit 3 Data Bit 1 Ground Ground Ground The pin configuration on the IS pin Parallel Output connector is pin 1 Data Bit 7 pin 2 Data Bit 5 pin 3 Ground pin 4 Data Bit 2 pin 5 Data Bit 0 pin 6 PO FLAG pin 7 ACK output device ready pin 8 SPARE extra programmable cond it ...

Страница 77: ...f parallel input interface flag flip flop 10 Free 11 Free 12 This signal indicates execution by the processor of a data output instruction to the parallel output port HIGH while valid data on bus 13 Tied to the clock of the parallel output interface flag f 1 i p flop 14 Tied to the output enable control of the parallel output interface data latch PARALLEL OUTPUT EXAMPLE Different printers have dif...

Страница 78: ...p Connect pin 7 to pin 9 if a negative going edge should set the flip flop B Construct a cable from the keyboard to the IS pin Parallel Input Connector which connects the data bits from the keyboard to the corresponding data bits at the connector and which connects the strobe signal from the keyboard to the input strobe pin at the connector It is possible to supply power to the keyboard from the m...

Страница 79: ... The motherboard I O interfaces and real time clock can be conJ igured to generate interrupt request signals to the S 100 bus There are eleven possible interrupt conditions which are grollped to generate four different interrupt requests as follows iltandard Serial Interface 1 Receiver Ready 2 Sync Detect 3 Transmitter Ready disarmable 4 Transmitter Empty disarmable 3econd Serial Interface 5 Recei...

Страница 80: ...ng grounding procedure is recommended 1 Connect the HORIZON chassis to signal ground by soldering a jumper wire between the two holes of the location C47 at the extreme left rear corner of the motherboard If the HORIZO is being used in an environment where static electricity is a problem e g synthetic fiber rugs or dry weather then install a 047 ceramic disc capacitor at location C47 instead 2 Be ...

Страница 81: ...the diskette st rting at disk address 4 In ert the diskette into drive 1 the left hand drive mounted to th front panel in a two drive system Orient the diskette so th t the write protect notch is up and the label faces to the riJht Make sure the diskette is resting gently against the back stJp and then close the drive latch If power is not already on check the power LED on the front panel then tur...

Страница 82: ...ipe fingerprints and dirt from the front panel and occasionally polish the wood cover TROUBLESHOOTING Should your computer system become non operational the first step is to isolate the problem If you have determined that the problem is with the HORIZON computer and not for example with the terminal a bad diskette or with a change in software then if possible run your boards in another S 100 compu...

Страница 83: ... and then play the result through a hi fi amplifier To do this remove the 74LSl61 at location 7D on the motherboard Then attach the test probe wire to jumper 2D pin 16 this is the input to the divider Next take the output of the divider at jumper 10A pin 11 and connect to the AUX input of the audio amplifier Finally connect the AUX input ground on the audio amplifier to signal ground on the mother...

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