Zenith SM-Z-89, Service Manual

Page 1: ...B9 90 Computer System Service Manual 2 I N data systems ZENITH DATA SYSTEMS SAINT JOSEPH MICHIGAN 49085 585 7 Copyright 1982 Zenith Data Systems All Rights Reserved Printed in the United States of Ame...

Page 2: ...service information for the following six Zenith Data Systems products 1 The Z 89 90 Computers 2 The Z 89 37 Double Density Disk Controller 3 The H 88 1 Single Density Disk Controller 4 The H 17 1 Fl...

Page 3: ...Z 89 90 Computers Service Manual ZENITH DATA SYSTEMS SAINT JOSEPH MICHIGAN 49085 I I 585 7 Copyright 1982 Zenith Data Systems All Rights Reserved Printed in the United Statee of America...

Page 4: ...ircuit Board 5 6 Terminal Logic Circuit Board 5 6 CPU Logic Circuit Board 5 15 Serial Interface I O Circuit Board 5 21 Block Diagrams fold outs SERVICE 6 1 CRT Adjustment 6 2 Switch Configurations 6 4...

Page 5: ...h access to 25th line 6 5 high x 8 5 wide 0 2 high x 0 1 wide approximate 5 x 7 dot matrix upper case 5 x 9 dot matrix lower case with descenders 8 x 10 dot matrix graphics 84 keys 60 alphanumeric 12...

Page 6: ...44 62 HE 444 84 IC U549 HE 443 904 See note 1 IC U557 HE 443 912 See note 2 IC U558 HE 443 754 HE 100 1817 NOTE 1 The memory chip is left out to receive the cable from the 16K Memory Expansion Board N...

Page 7: ...hich reads in part Receptacles connected to circuits having dif ferent voltages frequencies or types of current AC or DC on the same premises shall be of such design that attachment plugs used on such...

Page 8: ...4 Likewise open the latch plate on the other side of the cabinet top WARNING When the line cord is con nected to an AC outlet hazardous voltages can be present inside your Computer See Figure 2 1 Care...

Page 9: ...sure the POWER switch is off Then remove the screws that hold the terminal logic circuit board the rear circuit board Remove the two screws that hold the top of the CPU logic circuit board Disconnect...

Page 10: ...ocation of switch S401 Remember that as you look at switch S401 from the front of the Computer you select the one 1 positions of the switch by pushing the switches down and you select the zero 0 posi...

Page 11: ...d rates 110 9600 To do this place sections 0 1 2 and 3 of switch S401 to the proper positions as shown below The baud rate will be initialized or updated upon Reset or during power up BAUD SWITCH SECT...

Page 12: ...PY USAGE When you use a 5 1 4 1 hard sectored floppy disk integrated circuits part numbers HE 444 40 HE 444 62 or HE 444 84 must be installed at U518 Set SW501 switch sections as directed in the next...

Page 13: ...yours depends on what equipment you already have If you have 1 A Z 89 37 Double Density Controller you must install your Interface Board as shown in Figure 3 3 on Page 3 6 Switch SW501 on the CPU Boa...

Page 14: ...UTER CPU LOGIC C I RCU IT BOARD ___ I N S ET 2 z JUMPERS ON Z 89 67 BOARD DO NOT MOVE D7E IiDd1IUDD i JUMPER THESE WHEN US ING P506 AND P512 n o n O S l to 0 89 37 SERIAL 89 67 HERE BOAR D HERE HERE F...

Page 15: ...BOARD INSET 2 __ JUMPERS ON Z 89 67 BOARD SWITCH SW501 DO NOT MOVE D THESE JUMPERS D liD dDooo 7 JUMPER THESE WHEN US ING P504 AND P510 H 88 1 J HERE i c t SERIAL BOA RD HERE I i J Z 89 67 HERE r rCi...

Page 16: ...IRCUIT BOARD INSET 2 JUMPERS ON Z 89 67 BOARD DO NOT MOVE D7 liDClDooo i JUMPER THESE WHEN US ING P506 AND P512 I I n T L I Z 89 67 HERE SERIAL BOARD HERE lJ nrB l ULJ HERE I d I I U cue i L i II Figu...

Page 17: ...CUIT BOARD INSET 2 __ JUMPERS ON Z 89 67 BOARD SWITCH SW501 DO NOT MOVE D THE SE JUMPER S J D IiDcmUOO i JUMPER THESE WHEN US ING P506 AND P512 Z 89 67 1 HERE l I I HERE I l II I c iV I I 0 I CL J J I...

Page 18: ...modification use a 4700 n 1 4 watt resistor HE 6 472 yellow violet red slide a length of sleeving over the resistor and solder the resistor between pins 1 and 12 of plug P2 on the foil side not the co...

Page 19: ...can result in reduced data reliability When precompensa tion is selected it is factory pre set to 300 nanoseconds J1 J2 13 Select port 170 or 174 Both jumpers must be at 170 or both jumpers must be at...

Page 20: ...COMPUTER 3 12 1 Figure 3 8 Z 89 37 Interface Board i I I I...

Page 21: ...ting the programming modules if presently uncut or by replacing the programming module with a properly set dip switch DRIVE DRIVE r J 1 2 u w Figure 3 9 TYPES OF DRIVES FLOPPY DISK 48 TPI H 17 1 CONTR...

Page 22: ...ZERO 051 t I PROGRAMM I NG MODULE HAROWARE UNIT ONE 052 II I I CUT 1r P R O GR A M M I 7 NG l J MODULE I In t HARDWARE UNIT TWO 053 Figure 3 10 Single sided drives H 17 1 programmed for 2 89 37 Contr...

Page 23: ...1 1 1 1 1 COMPUTER 13 15 Hardware Unit Zero 081 Hardware Unit One 082 l sn 1 1 1 1 1 1 1 n PROGRAMM ING MODULE PROGRAMM I NG MOD ULE n Hardware Unit Two 083 Figure 3 11 Double sided drives H 17 4 pro...

Page 24: ...3 16 IL COMPUTER HARDWARE UNIT ZERO HARDWARE UNIT ONE HARDWARE UNIT TWO Figure 3 12 Single sided drives H 17 1 programmedfor H 88 1 Controller...

Page 25: ...normal with Z 47 8 1 floppy disk 01 Port 170 173Q has a 8 1 floppy disk normal with Z 47 10 Undefined 11 Undefined 4 0 Boots from device at port 174 177Q 7CH 7FH 5 1 4 1 hard sectored floppy disk 1 B...

Page 26: ...as follows 7BH is Z 37 soft sectored disk 47 8 floppy disk 67 8 hard disk 7FH is 5 1 4 hard sectored floppy disk 47 8 floppy disk 67 8 hard disk SWITCH SECTIONS SETTING DESCRIPTION 00 Port 174 177Q 7...

Page 27: ...ROM HE 444 66 already installed and the jumper wire incorporated directly into the PC board foil These boards should not be used with the old ROM HE 444 42 These jumpers should be set as follows JJ501...

Page 28: ...T 3 an RST 4 oranRST 5 respectively instruction is executed when the inter rupt for that port occurs The first port on the circuit board is located at address 340 3470 OEOH OE7H and is normally used a...

Page 29: ...COMPUTER 13 21 Ir o o o L J e r O I e r e r e r e r e r l Oa 01 341 op o c J e r 0 J o 341 lP II f 32 DC II OFF m H o o o 321 Figure 3 13 S I ena interface board...

Page 30: ...l I O DB OF 330 337 DeE Serial I O EO E7 340 347 Console I O E8 EF 350 357 NMI Fo F1 360 361 General purpose port F2 362 NMI FA FB 372 373 GENERAL PURPOSE PORT OF2H BIT DEFINITIONS BIT INPUT ISW501 SW...

Page 31: ...decimal H R adix Hexadecimal H This summary is a list of the commands that the Computer will respond to and the responses that it will make You may enter commands in either upper or lower case charact...

Page 32: ...4 Set the user Program Counter values P or P ADDR 5 After the prompt enter P The Computer will complete the Program Counter mes sage Now you may enter a new program counter value in split octal and te...

Page 33: ...hould then see a flashing line cursor or block cursor if it was selected in the upper left hand corner of the screen The keyboard allows you to send data to the Computer of the screen Most of the keys...

Page 34: ...uter is initially turned on it clears the screen by placing spaces in all character positions The cursor is the blinking horizontal line that appears at the home position It underlines the character p...

Page 35: ...acter input FIFO first in first out buffer for receiving and holding characters until the terminal section can process them In some cases such as when the terminal section is operating at 9600 baud in...

Page 36: ...h 80 If the cursor is at character position 73 through 79 it will only move one charac ter position to the right each time you type the TAB key If the cursor is at character position 80 it will not mo...

Page 37: ...Duplicates the BACK SPACE key Horizontal Tab HT or CTRL I Duplicates the TAB key SCROLL line SCROLL page CONTROL KEY SCROLL SHIFT SCROLL Line Feed LF or CTRL J Duplicates the LINE FEED key Carriage R...

Page 38: ...4 a COMPUTER i l v...

Page 39: ...mounted on the power supply cir cuit board 200 299 Parts mounted on the v deo circuit board 300 399 Parts mounted on the keyboard circuit board 400 499 Parts mounted on the terminal logic cir cuit boa...

Page 40: ...The three power supplies 65 8 5 and 18 are not interconnected on the power supply circuit board Instead they pick up their appropriate grounds at the circuit boards they power The 65 volt video suppl...

Page 41: ...horizontal section through R213 VERTICAL SECTION The vertical portion of the video circuit board con sists of two sections a sweep generator and an amplifier The sweep or ramp generator consists of C2...

Page 42: ...oard They generate a time delay that provides horizontal centering and a pulse of the proper width to drive the horizontal sweep system The horizontal deflection system transfers energy from the power...

Page 43: ...ion angle the current is decreased slightly at the left and right edges Width coil L203 is in series with the yoke and its reactance can be adjusted to change the total current through the yoke If its...

Page 44: ...tor of Q901 is coupled through resistor R904 to the cathode of the CRT Choke L901 in series with collector load resistor R903 provides high frequency compensation Grid voltages for the CRT are routed...

Page 45: ...It counts dot clock pulses until its output reaches binary fifteen 1111 During the fifteenth count the ripple carry output pin 15 goes low This pulse which is inverted by U426F puts a logic one on the...

Page 46: ...e CPU addresses I O port 300 pin 9 of U442 triggers the other half of U441 Its output pin 7 goes low for about six milliseconds and turns on the 1000 Hz tone This short duration causes the tone to sou...

Page 47: ...one wait cycle is automatically inserted by the Z80 on an I O instruction to allow the output buffer of U444 to turn on When the Qc output pin 4 of counter U433 goes high it drives the input of U432A...

Page 48: ...ta outputs of U445 drive the DO D7 bits of the data bus The chip select input pin 18 of U445 is driven by pin 11 of U442 the I O decoder When the Repeat key is held down the input of U446D is low and...

Page 49: ...U454 isa standard EIA line receiver The serial data in line drives the input of U454A which converts the EIA voltages toTTL levels and drives the serial input of the ACE Likewise the RLSD DSR and CRS...

Page 50: ...o the address stored in the cursor address registers Controller Read Write Logic The CS and E inputs of the CRT controller must be selected in a particular sequence to perform read and write operation...

Page 51: ...s an input of U423A Video shift register U421 latches parallel dot data from the character generator at inputs A H and shifts it out of output On in synchronism with the dot clock the dot clock drives...

Page 52: ...on the secondary refresh bus does not coincide with what should be written on the screen Consequently the video is blanked during a read or write When pin 9 of memory decoder U435 goes low to select t...

Page 53: ...is insures that the display will complete its reset function before the Computer resets thus resulting in a proper indication on the display The rising edge of the K8RST L signal toggles US06A and cau...

Page 54: ...l Ml occurs prior to the refresh signal during the instruction fetch AO AI5 MI CYCLE 11 1 2 I 14 1I II PC I REFRESH ADDR I I r l_ _ h I _ JTN I Figure 5 1 Figure 5 2 shows the timing of a memory read...

Page 55: ...r L II PORT ADDRESS I I I IN J C 10 I OUT DATA BU DATA BUS AO A7 Figure 5 3 Figure 5 4 occurs only at the end of an instruction cycle that both an Ml and an IORQ are generated LAS T M CY CLE MI OF IN...

Page 56: ...ftware to configure bank 0 as RAM The write enable line WE L will be asserted low whenever there is no read BRD L is high no refresh BRSH L is high memory is selected DMERQ L is low and the bank selec...

Page 57: ...an interrupt request has occurred It transmits this information to the processor by the INT L line The interrupt priority is also determined by U557 and is available on output pins 6 7 and 9 This inf...

Page 58: ...next Ml cycle U555B is toggled which latches its output pin 0 low Another Ml cycle is executed which now toggles U556 s output pin 8 high This generates the interrupt at level 2 restart 2 The softwar...

Page 59: ...OEoH OE7H 340Q 347Ql and is used as the line printer port Its output is standard EIA with a DeE connector The second port is located at 110 OOaH ODFH 330Q 337Q and again is used as the standard EfA o...

Page 60: ...5 221L COMPUTER...

Page 61: ...c board by placing a jumper wire between pins 3 and 5 on J404 of the terminal logic board Hard reset the Computer the MTR prompt H will appear Check Dynamic RAM Test with MTR 90 by typing the letter T...

Page 62: ...nces of an electrical shock while you are making adjustments keep your other hand away from this unit and all other metallic objects Plug in the line cord and set the POWER switch to ON After a short...

Page 63: ...aracters are of uniform size NOTE You should make the next adjustment in a darkened room Turn G1 control R262 clockwise as viewed from the left until the raster just disappears If the display width is...

Page 64: ...c Board For the switch locations refer to Figure 6 3 UU o 5402 n a aBJ 1 i01234567 ON _ _ _ _ _ J _ _ i _ __ __ J _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ 1 J I J L_ 0 540 I Jf 1BBQQ BB L 101234567...

Page 65: ...esh 1 50 Hz refresh SWITCHS401 SWITCH SECTION DESCRIPTION 0 3 Baud Rate 4 Parity Enable 5 Odd Even Parity 6 Normal Stick Parity 7 Half Full Duplex MODE SWITCH SECTION 0 1 2 3 4 5 6 7 9600 Baud 0 0 1 1...

Page 66: ...Then proceed directly to Programming Jumpers See Figure 6 4 5 1 4 1 HARD SECTORED FLOPPY USAGE When you use a 5 1 4 1 hard sectored floppy disk integrated circuit part numbers HE 444 40 HE 444 62 or...

Page 67: ...l yours depends on what equipment you already have If you have 1 A Z 89 37 Double Density Controller you must install your Interface Board as shown in Figure 6 S on Page 6 8 Switch SWSDI on the CPU Bo...

Page 68: ...ER CPU LOGIC CIRCUIT BOARD INSET 2 _ JUMPERS ON Z 89 67 BOARD DO NOT MOVE a j HE J UMPER cto 0 o tiPUOO t o _ JUMPER THESE WHEN USING P506 AND P512 n o 0 9 0 0 0 _ 37 SERIAL 89 67 HERE BOARD ERE HERE...

Page 69: ...UMPERS o cW000 0 _ _ J t JUMPER THESE WHEN US NG P504 AND P5 O INSET 2 __ i I__ J VI LJ SI I I Z 89 67 1 1 H 88 J HERE SERIAL HERE I BOARD e HERE ra n l I LJ t De I I I I ULJ e J L J M j 1 18 1 DOWN F...

Page 70: ...6 10 IL COMPUTER CPU LOGIC CIRCUIT BOARD INSET 2 z HERE SERIAL BOARD HERE Z 89 67 ERE Figure 6 7 DO NOT MOVE 51E _ c DDD _ r 1 JUMPER THESE WHEN USING P5D6 AND P512 JUMPERS ON Z 89 67 BOARD...

Page 71: ...CPU LOGIC CIRCUIT BOARD INSET 2 SWITCH SW501 JUMPERS ON Z 89 67 BOARD DO NOT MOVE D THESE JUMPERS f oo liJ leJpOOO C o r J 1 JUMPER THESE WHEN USING P506 AND P512 I iQ Z 89 67 HERE LJ HERE nrBl U r I...

Page 72: ...he modification use a 4700 n 1 4 watt resistor HE 6 472 yellow violet red slide a length of sleeving over the resistor and solder the resistor between pins 1 and 12 of plug P2 on the foil side not the...

Page 73: ...data reliability When precompensa tion is selected it is factory pre set to 300 nanoseconds Programming modules Jl J2 J3 Select port 170 or 174 Both jumpers must be at 170 or both jumpers must be at...

Page 74: ...Figure 6 10 COMPUTER...

Page 75: ...odules if presently uncut or by replacing the programming module with a properly set dip switch DRIVE DRIVE L r J 1 2 EEEI u LI Figure 6 11 TYPES OF DRIVES FLOPPY DISK 48 TPI H 17 1 CONTROLLER BOARD S...

Page 76: ...ZERO DS1 L _ J PROGRAMM I NG MODULE u HARDWARE UNIT ONE DS2 1_ _ I l CJo J CLIT INSET B L ODD AMSsSH X321S PROGRAMM ING MODULE I 3 L HARDWARE UNIT TWO DS3 Figure 6 12 Single sided drives H 17 1 progra...

Page 77: ...1 1 1 1 J J1 r _ I l T l l PROGRAMMING MODULE Hardware Unit One 052 f1 1 1 HHJ 6 1 1 JI 1 1 1 PROGRAMM ING MODULE PROGRAMM ING MOD ULE 1 1 _1_1 S n 1 1 1 1 1 1 1 1 Hardware Unit Two 053 L Figure lli 1...

Page 78: ...6 181 roMMm HARDWARE UNIT ZERO HARDWARE UNIT ONE HARDWARE UNIT TWO Figure 6 14 Single sided drives H 17 1 programmed for H 88 1 Controller...

Page 79: ...00 baud not currently supported vice at port 174 177Q 7CH 7FH 5 1 4 hard y disk vice at port 170 173Q 78H 7BH Z 47 8 floppy normal power up or SHIFT RESET not recommended SWITCH SETTING I DESCRIPTION...

Page 80: ...sections 0 1 2 and 3 which are defined as follows SWITCH SECTIONS SETTING DESCRIPTION 00 Port 174 1770 7CH 7FH is 5 1 4 hard sectored floppy disk 01 Port 174 1770 is Z 47 8 floppy disk 1 and 0 10 Port...

Page 81: ...HE 444 66 already installed and the jumper wire incorporated directly into the PC board foil These boards should not be used with the old ROM HE 444 42 These jumpers should be set as follows JJ501 JJ...

Page 82: ...f tolerance Your drive unit has a control labeled R30 or R7 which is used to vary the drive speed The location for this control for various drives is shown in Figure 6 15 This adjustment may be extrem...

Page 83: ...unt of RAM installed the last working address LWA will normally indicate one of the following three numbers Amount of RAM LWA LWA Installed Offset Octal Decimal 16K 137377 24575 24K 1 32K 237377 40959...

Page 84: ...iar with this test you should be able to locate most memory data failures without having to refer to the Schematic MTR 89 48K LWA 337 377 32K LWA 237 377 16K LWA 137 377 U549 U548 U547 U546 U545 U544...

Page 85: ...or example as a possible cause check that part and other components connected to that part to see that they are in good working order WARNING Measure the anode voltage only with an approved high volt...

Page 86: ...Capacitor C102 No 12 V or is too high or too low 1 IC U404 2 Diodes 0101 0104 3 Capecitor C104 No 5 V or is too high or too low 1 IC U405 2 IC U404 12 V source supplies 5 V regulator 3 Diodes 0101 01...

Page 87: ...tness 1 Transistors 0901 0902 2 Diode D902 3 Capacitors C901 C905 4 Brightness control R1 Resistors R901 R904 R214 R218 R219 R217 5 Grid voltages One bright horizontal line on screen 1 Vertical amplif...

Page 88: ...2 brown wires 3 Rosistor R257 Horizontal centering does not work 1 IC U201 2 Horizontal centering control R246 3 Capacitor C221 No horizontal sweep but sync pulses are present at P202 1 1 Diode D206 2...

Page 89: ...ement part A Find the circuit component number R5 C3 etc on the X Ray View B Locate this same number in the Circuit Com ponent Number column of the Replacement Parts List C Adjacent to the circuit com...

Page 90: ...21 COMPUTER Z 89 AND Z 90 POWER SUPPLY CIRCUIT BOARD Part number HE 181 3244 Shown from the component side Z 89 AND Z 90 VIDEO DRIVER CIRCUIT BOARD Part number HE 181 3387 Shown from the component sid...

Page 91: ...17 3 COMPUTER _ I R268 r 0 Q e22a Z 89 AND Z 90 VIDEO DEFLECTION CIRCUIT BOARD Pari number HE 181 3400 Shown from thecom ponent side...

Page 92: ...Z 89 AND Z 90 TERMINAL LOGIC CIRCUIT BOARD Parl number HE 181 3383 Shown from the com pOllen side 7 41 COMPUTER...

Page 93: ...c COMPUTER 17 5 Z 89 AND Z 90 CPU LOGIC CIRCUIT BOARD 2 89 Pari number I IE 181 339ti 2 90 ParI llumber HE 181 3ti15 Shown from the compo nenl side...

Page 94: ...Z 89 AND Z 90 SERIAL INTERFACE I O CIRCUIT BOARD Part number HE 181 3369 Shown from the com ponent side 7 61 COMPUTER...

Page 95: ...second section provides a lead configuration detail basing diagram for each semiconductor Part Number The Part Numbers in the second section are also listed in numerical order COMPONENT NUMBER INDEX T...

Page 96: ...5 0207 HE 417 622 0208 HE 417 621 0209 HE 417 926 0210 HE 417 926 0211 HE 417 264 0212 HE 417 263 0213 HE417 195 0214 HE 417 923 Integrated Circuits CIRCUIT PART COMPONENT NUMBER NUMBER U201 HE 442 53...

Page 97: ...94 U454 HE443 795 Resistor Packs CIRCUIT PART COMPONENT NUMBER NUMBER RP HE 9 98 RP2 HE 9 98 Diode CIRCUIT PART COMPONENT NUMBER NUMBER 0501 HE 56 56 Transistor CIRCUIT PART COMPONENT NUMBER NUMBER 05...

Page 98: ...IGURATION WITH TOP VIEW HE 56 56 1N4149 10 rnA 75 V HE 56 58 1N709A Zener 6 2 V 25 rnA NOTE HEATH PART NUMBERS HE 56 73 MZ2360 Compensation ARE STAMPEO ON 1ol0ST DIODES m HE 56 93 FD333 225 rnA 125 V...

Page 99: ...17 282 MJ2841 E 8 C C E HE 417 811 MPSL01 B HE 417 821 MPSA06 B E B MPSA56 B HE 417 822 HE 417 823 MPU131 C HE 417 834 MPSU10 D C G A HE 417 874 2N3906 B G HE 417 875 2N3904 B E D HE 417 885 MPSA65 B...

Page 100: ...09 DESCRIPTION 5 volt Regulator LEAD CONFIGURATION TOPYIEW INPUT I PUT 12 WIDE A _11 e SPAC I CASE IC HE 442 53 555 Timer TRIGGER 2 OUT PUT 3 7 DISCHARGE THRESHOLD CONTROL VOLTAGE HE 442 54 HE 442 616...

Page 101: ...NUMBER REPLACED WITH 7905 2 5 2 V GNDP HE 442 630 Regulator lN au GND IN OUT IN PUT II PUT121 WIDE 8 12 V 5 A SPACj HE 442 650 78H12 Regulator COMMON t J 13 78M12CKC 12 V D HE 442 663 Regulator OUT IN...

Page 102: ...42 683 HE 443 18 MAYBE REPLACED WITH UA7812 79M05 7404 DESCRIPTION 12 V Regulator 5V Regulator Hex Inverter LEAD CONFIGURATION TOP VIEW IN GND OUT OUT HE 443 22 HE 443 34 74121 7492 Mon08table Multivi...

Page 103: ...PTION LEAD CONFIGURATION TOP VIEW HE 443 73 7416 Line Driver GND L HE 443 77 HE 443 721 7438 2112 2 Quadruple 2 fnput Positive NAND Buffers With Open collector Outputs 256 x 4 RAM AJ A1 AI AD AS A7 GN...

Page 104: ...732 HE 443 733 MAYBE REPLACED WITH 74LS74 SN74LS290 SN74LS30 74LS293 DESCRIPTION Dual 0 Flip flop BCD Counter a input NAND 4 Bit Binary Counter LEAD CONFIGURATION TOP VIEW I 10 I CK I PR IQ 10 GND ClR...

Page 105: ...3 760 MAYBE REPLACED WITH 74LS240 74LS04 74LS161 4040 DESCRIPTION Octal buffer 3 state outputs Hex Buffer 4 Bit Binary Counter 12 Bit Binary LEAD CONFIGURATION TOP VIEW GND RIPPLE OUTPUTS CARRY OUTPUT...

Page 106: ...Circuits Cont d PART NUMBER HE 443 764 HE 443 776 HE 443 778 MAYBE REPLACED WITH 2114 8251 4093 DESCRIPTION 11 x 4 RAM USART Quad 2 inpul NAND SCHMITI Trigger LEAD CONFIGURATION TOP VIEW 02 OJ RxO WR...

Page 107: ...443 792 HE 443 794 MAYBE REPLACED WITH 74LS02 74LS08 74LS244 74LS132 75188 or 1488 DESCRIPTION Quad 2 input Positive NOR gates Quad 2 input Positive AND Gates Noninverting 3 state output octal buffers...

Page 108: ...VIEW Vee HE 443 795 HE 443 797 75189 or 1489 74LS10 EIA Receiver Triple 3 input Positive NAND Gate INPUTS 4A 48 GND 2A 28 INPUTS u OUT PUT 3Y 2Y OUTPUT INPUTS 38 10 OUTPUT 4Y I Y OUTPUT I A 18 INPUTS...

Page 109: ...ACED WITH 74LS42 DESCRIPTION BCD la Decimal Decoder LEAD CONFIGURATION TOP VIEW HE 443 811 HE 443 818 HE 443 822 74LS125 74LS05 74LS139 Quad bus buffer gate with 3 state outputs Hex Inverter Dual 2 to...

Page 110: ...LS241 74LS373 DESCRIPTION Octal buffer Octal D latch LEAD CONFIGURATION TOP VIEW GNO 1 OUTPUT CONTROL HE 443 856 S2350 Universal Synchronous Receiverl Transmitter USRT GNO I VCC 2 NPB POE CS TSO TBMT...

Page 111: ...t d PART NUMBER HE 443 857 HE 443 872 MAYBE REPLACED WITH 74LS367 74LS14 DESCRIPTION Hex Bus Drivers Hex SCHMITI Trigger Inverters LEAD CONFIGURATION TOP VIEW GND HE 443 952 L HE 443 875 8250B 74LS32...

Page 112: ...4 AI 00 01 02 03 04 0 D6 07 Y6 DATA OUTPUTS 6 GI Y7 GNO bUT PUT SELECT N A8 l MI 27 30 MR EO 31 19 32 SYSTEM IORO 20 33 CONTROL RD 21 34 WR 22 3 36 RfSH 2B 37 3B Hill I B 39 40 WA IT I CPU ZBO CPU 2 C...

Page 113: ...L PART NUMBER HE 443 891 HE 443 892 HE 443 900 HE 443 904 MAYBE REPLACED WITH 74LS86 74LS166 74S74 MK4116 4 DESCRIPTION Quad 2 input Exclusive OR 8 bit shift register Dual D Flip flop 161 x 1 RAM LEAD...

Page 114: ...conlrOI R w CLK Oi splay Cursor Re resh Memo ry Add resse CRT Controller 6B45 HE 443 906 HE 443 912 74L5148 B line to 3 line Priority encoder OUTPUTS EO GS INPUTS OUTPUT AO EI 2 AI GN0 I NPUh OUTPUTS...

Page 115: ...AD CONFIGURATION TOP VIEW Quad 2 input Exclusive OR 74586 HE 443 915 HE 444 19 AS A9 e53 CSi 21 x 8 bit AID HE 444 29 2316 or ROM CS2 L 8316 Available only from Heath Co 08 07 02 HE 444 37 HE 444 62 o...

Page 116: ...TION 256 x 8 bit PROM Available only from Heath Co 41 x 8 bit PROM Available only from Heath Co LEAD CONFIGURATION TOP VIEW AD A AD bAD CAD 0 AD f DO I DO 2 DO DO 4 GNO Vee es AD E ADD AD e AD b A0 A...

Page 117: ...Z 89 and Z 90 part number HE 181 3400 CIRCUIT PART DESCRIPTION CIRCUIT PART DESCRIPTION Camp No NUMBER Camp No NUMBER RESISTORS Resistors cont d NOTE The following resistors are 5 1 2 watt unless oth...

Page 118: ...C220 Not used R247 HE 6 6491 6490 0 1 C221 HE 29 22 0047 ILF polystyrene R248 HE 6 273 27 kO C222 HE 21 176 01 ILF ceramic R249 HE 6 392 39000 C223 HE 29 22 0047 ILF polystyrene R250 Not used C224 HE...

Page 119: ...ART DESCRIPTION CIRCUIT PART DESCRIPTION Compo No NUMBER Compo No NUMBER RESISTORS Resistors cont d R430 Not used NOTE All resistors are 1 4 watt 5 R436 HE 6 102 12 10000 R437 HE 6 472 12 47000 R401 H...

Page 120: ...HE 404 613 12 288 MHz crystal C427 C457 HE 21 95 1 JLF ceramic DIODES TRANSISTORS IC s C458 HE 21 176 01 JLF ceramic C459 C474 HE 21 95 1 JLF ceramic See Semiconductor Identification CPU LOGIC CIRCUIT...

Page 121: ...W1 HE 60 642 115 230 switch SW2 HE 60 643 NORM LOW switch SW3 HE 61 43 Power switch F1 HE 421 23 1 ampere fuse F1 HE 421 25 1 5 ampere fuse HE 401 163 Speaker V1 HE 411 838 White CRT OR HE 411 851 Whi...

Page 122: ...5 HE 134 1134 HE 134 1135 HE 134 1155 Model Z 47 HE 134 1101 HE 134 1102 HE 134 1103 HE 134 1104 HE 134 1105 HE 134 1106 20 conductor head to PCB 6 conductor head sensor 6 conductor paper sensor 5 con...