1484 C Kaypro Technical Manual Aug84 pdf

(1)

KAYPRO TOCHNlCAL

MANuAL

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3.0 3.1

3.2

3.3 3.4

3.5

3.6 3.7 5.0 5.1 5.2

6.0

6.1

6.2

6.3 6.4 6.5 6.6 6.7 7.0 7.1 7.2 7.3

7.4

7.5 Introduction

Purpose of Technical Manual Soope of Technical Manual

FCC In:fbnra.tion M::rlel Speci fications

KAYPRO 2

KAYPRO 2/84

am

2X KAYPRO

4

KAYPRO 4/84 . KAYPRO 4X

KAYPRO 10 KAYPRO ROOIE

RCM Revisions - CP/M Canpatibility Olassis

1-1

1-2

2-1

3-1 3-2 3-3 3-4

3-5

3--6 3-7 4-1

Raicva1/Replacenent of H:lod (Exc. ROOIE) 5-1

'!buch-up In1bnnation 5-2

Mainboards-Troub1eshooting Tips

KAYPRO 2 (81-110-11)

KAYPRO 2/4 (81-240-n)

KAYPRO 10 (8l-180-n)

KAYPRO 2/84 and 2X (81-294-n) KAYPRO 4/84 (81-184)

KAYPRO Rc.EIE (81-296-n)

Renoval/Instal1ation Instructions CRr Assemblies

Descriptions and Adjustments Video Alignment

Video Signals en KAYPRO Mai.nboard

ALIGI.M1\C Diagnostic Listirg

Renoval/Installation Instructions

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CQfl'fBl'S (ODtinued)

~Ql PAGE

8.0 Pc7Ner Supplies

8.1 Introduction 8-1

8.2 Description and 220V Configuration 8-2

8.3 Removal/Installation Instructions 8-5

9.0 Diskette Drives

9.1 Introduction/Disk Drive Cleaning 9-1

9.2 Which Brand of Drive Is It? 9-2

9.3 Jumpering Diagrams 9-5

9.4 High-Density (Drivetec) Drives 9-9

10.0 Hard Disk Drives (KAYPRO 10)

10.2 Description 10-2

10.3 Hard Drive Con figuration 10-3

10.4 Hard Drive or Floppy Drive Removal/

Installation Instructions (KAYPRO 10) 10-4 11.0 Hard Drive Controller Board (KAYPRO 10)

12.0 Inter face Board (KAYFRO 10'>

13.0 Keytx::>ards 13-1

14.0 ROUE RaIoval/Installation Instructions

14.1 Cllassis Covers 14-1

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CCJiI'lBll"S ( Qmt.inued)

SB!l'ICN PAGE

15.0 Troub1eshooti~

15.2 KAYPRO 2 and 4 Symptan-Fix Guides 15-2

15.3 KAYPRO 10 Symptan--Fix Guide 15-8

15.4 RCBIE Symptan-Fix Guide 15-15

15.5 KAYPRO 2/84 and 2X Synptan--Fix Guide 15-21 15.6 KAYPRO 4/84 and 4X Symptan-Fix Guide 15-22

16.0 System I/O

16.1 Video Camland Protocol 16-1

16.2 Key1:x>ard Codes and Ftmctions 16-2

16.3 Connector Pin-o..tt.s 16-3

16.4

Port

Addresses 16-10

17.0 Re ference Section

17.1 ASCII Chart 17-1

17.2 Merory Maps 17-2

17.3 Vendor Addresses 17-6

18.0 Suggested Re ferences 1S-:-1

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1.1 PURJ?ajE CF T!XB1ICAL MN!U\L

'!his publication

is

int.eOOed to be a technical re ference guide to be used by trained repair technicians. It will attempt to

caver

all dealer-serviceable sections of Kaypro computers. '!his manual replaces previous manuals on the

subject.

The procedures and in:fbrmation contained in this manual assume technical

expertise on the part of the reader. 'lb avoid personal injury, do IDt perfbrm any servicing tmless you are a quali fled service technician.

It

is

our desire to provide dealers with the infbrmation and sUR?Qrt needed to expedite repairs and provide the users with the service they deserve. We encourage your conunents and suggestions regarding this manual.

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'!be in:fbrmation and procedures covered by this manual assume sane technical krlc:Jwledge on the part of the reader.

'!be J;X>licyof Kaypro Corporation is to repair computers to the modular level only. ENen Kaypro1s repair technicians do not repair switching power

supplies, CRl' assemblies, or disk drives. Repairs to Irodular oomponents not manufactured by Kaypro Corporation (J;X>Wer supplies, CRI' assemblies, disk drives) are

Nor

oovered by this manual.

H:>wever, we do

not

discourage dealers and technicians who have the knowledge and the tools to repair to the compalerlt level :from doing so, on out-o

f-warranty Kaypro canput.ers.

'!be adjustment

am

rerroval/replacement in:fbrmation in this manual is organized

by module type, with the exception of reIOOVal/replacement infbrmatioo 1br the KAYPRO RCBIE, which is placed in a separate sectioo due to the di fferences in chassis design and hardware module placement in that machine.

(7)

As Kaypro keeps in step with oomputer technology, the models have changes which a ffect FCC ratings. 'nle proper rating is a ffixed to the back of each oomputer. Caltact the Kaypro Engineering Department if you need further in1brmation.

(8)

3.8 MCIEL SPl!ClFlCATICBS

3.1 I<AYPRO 2 SPl!ClFlCATI(H)

CPU

DISK srCEAGE

VIDEO SCREEN

I/O CCNNrel'ICNS

Z-S'" 2. 5 MHz

641< bytes

Sl-ll"'-n or Sl-240-n series.

Two 5-1/4 inch, double~ensity, single-sided, floppy disk drives, providing

19lK bytes of storage per diskette.

Detachable, 72 key typewriter style keyboard with IS programnable keys. Nal-glare, 9-inch, green tilOSPhor screen with a 25 rOil x S'" column

display.

Ole "Centronics"-type parallel port, ale RS-232C serial port.

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3.2 IQ\YPRO 2/84 and 2X SP&!li'1CATIQ'IS

CPU

RAM

DISK s:raw;E

(Kaypro 2/84)

DISK srCRAGE

(Kaypro 2X)

VIDEO SCREEN

I/O Cc:NNECl'ICNS

ZOO-A 4.0 MHz

641< bytes

81-294-n series.

Two 5-1/4 inch double-density, s~le sided, flOJ;'PY disk drives, providing 1911< bytes of storage per diskette.

Two 5-1/4 inch density, double-sided, flOJ;'PY disk drives, providing

39m< bytes of storage per diskette.

Detachable, 72 key typewriter style keyboard with 18 programnable keys. Non-qlare, 9-inch, green phosphor

screen with a 25

row

x 8eJ column display.

(he "Centronics"_type parallel part,

1:\\0 RS-232C serial parts.

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3.3 KAYPlID 4 SPl!X!lFICATlQ'IS

CPU

DISK STCEAGE

KEYBmRD

VIDEO SCREEN

I/O CCNNECI'ICNS

Z-80 2.5 MHz

641< bytes

81-240-n series.

Two 5-1/4 inch density, double-sided, floppy disk drives, providing 39m< bytes of storage per diskette. Detachable, 72 key typewriter style keyboard with 18 programnable keys. Non-glare, 9-inch, green phosphor screen with a 25 row x 80 column display.

(he "Centronics"_type parallel port,

ale RS-232C serial port.

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3.4 KAn'RO 4/84 SPB!IFICATIO!1S

CPU

DISK S'I'CiWE

VIDEO SCREEN

I/O CCNNEX:TICNS

MCDEM

REAL-TIME CLcx:::K

Z-80A 4.0 MHz

641< bytes

81-184-n

series.

Two double-density, Cbuble-sidErl, floppy disk drives, providing 39m<

bytes of storage per diskette. Detachable, 72 key typewriter style keyboard with

18

prograntnable keys. Non-glare, 9-inch green phosphor

screen

with

a 25

row

x

80

column

display.

(he "Centronics"-type parallel port, t\\1O RS-232C serial ports, one RJllC ncdular telephone jack.

Built-in, 300-baoo ncdem, with Bell System

103

cacpatibility. Uses

Texas

Instruments

TMS99531/TMS99532.

Built-in real-time clock. Uses Natiooal

t+158167.

-_r."_

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3.5 KAYPRO 4X SPB!ll'l~Q1S

CPU

DISK S'I'<::RAGE

VIDEO SCREEN

I/O CCNNECl'ICNS

MCDEM

REAL-TIME CLOCK

Z-80A 4.0

MHz

64K bytes

81-296-n series.

Two 5-1/4 inch, high-density, double-sided, flowy disk drives providing 2.6M bytes of storage per diskette. Detachable, 72 key typewriter style keyboard with 18 programnable keys. Non-glare, 9-inch, green PhoSFhor screen with a 25 row x 80 column display.

Qle "Centronics"-type parallel port, two RS-232C serial ports, one RJllC ncdular telephone jack.

Built-in, 300-baoo. ncdem, with Bell System 103 compatibility. Uses Texas

Instruments TMS99531/TMS99532.

Built-in real-time clock. Uses National Mo158167.

(13)

3.6 :KAYPRO 18 SPB!IFlCATIQ1S

CPU

DISK STORAGE

VIDEO SCREEN

I/O CCNNECl'ICNS

Z80A, 4.0 MHz

641< bytes

8l-l80-n series.

(be 5-1/4 inch dOuble-densi ty, double-sided, flowy disk drive providing 3901< bytes of storage per diskette. (be hard disk drive providing 10M bytes of storage.

Detachable, 72 key typewriter style keyboard with 18 programnable keys. Non-glare, 9-inch, green {ilosptlor screen

with a 25 reM x 80 column display.

(be "Centronics"-type parallel port, two RS-232C serial ports.

(14)

3.7 DnW) RmIE SPB!lFlCATIOE

CPU-DISK STCEAGE

VIDEO SCREEN

Ilo

CCNNECI'ICNS

MCDEM

Z8M, 4.0 MHz

641< bytes

8l-296-n series.

Two 5-1/4 inch, high~ensity, double-sided, fJ..oppy disk drives providing 2.6M bytes of storage per diskette. Detachable, 72 key typewriter style keyboard with 18 pr03Iallluable keys.

Non~lare, 9-inch, green PhOsphor

screen

with

a 25 rOIl x 00 collllm display.

Ol.e 1.'Centronics"type parallel port, two RS232C serial ports, ooe RJlle roodular telephone jack.

Built-in, 3000-balXl modem, with Bell System 103 compatibility. Uses Texas

Instruments 'IMS99531/'IMS99532. . Built-in real-time clock. Uses National ~8l67.

(15)

CP/M VERSICB I<AYPRO PARI' t ReM VERSIQT (:fDr CP/M disk)

2/83 2.2F 0777 81-149-C

or

81-232-A

4/83 2.2F 1475 81-232-A

4/83

+

88 2.2F 1475 81-232-A

2/84 2.2G 2619 81-292-A

4/84 2.2G 2622 81-292-A

4/84

+

88 2.2G 2622 81-292-A

2 X 2.2G 2470 81-292-A

4X

2.2G 2340 81-326-E

RCBIE 2.2G 2340 81-326-E

(16)

5.8 cassIS

5.1

amssm

IUD lBD1AL (FJCa:P1' I<AYPRO Ra3IE)

1. Turn off the machine.

2. Disconnect AC power by unplugging the power oord :from wall outlet. 3. Remove the ten screws :from the chassis hood: there are two on top

and :fOur on each side.

4. RsIove the hood :fran the chassis.

1. IDwer the hood onto the unit.

2. Align the two holes on top of the hood with those on top of the chassis.

3. Insert the two flat-head screws into the holes on the top of the

chassis and start them, but do IDt tighten them yet.

4. Insert the eight round-head screws, :fOur on each side,

and

start

them.

5. Tighten each screw securely.

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Kaypro Corp:>ratioo has small amounts of touch-up paint fur Kaypro hoods and chassis available to the dealers. Contact the Hardware Technical Sugx>rt personnel to obtain this paint.

O:::casionally a customer's computer will have scratches on the hood or chassis. A small amount of rubbing compound, when carefully applied, will often smooth

out very small scratches on a hood or chassis. Should painting be necessary, there are two sizes of sable paintbrushes to have CD hand: size 00 and size 000. 'Ihese brushes are available at any art supply store.

(18)

6.0~

'!he :fOllowing sections contain schematics, chip layout diagrams, and IC lists

(by U-number) :fOr Kaypro mainboards. 'nUs is not intended to be a theory of operation, but rather an aid to locating possible problems on a mainboard. Consult an appropriate databook (TrL, Zilog, etc.) i f you need to find out the internal \t.Orkings of a particular IC.

MAINBCNID TRClJBLESHoorING TIPS:

A blank EPRCM

can

be used to help troubleshoot Kaypro mainboards 0 f series

81-1112J, 81-240, and 81-100. '!he appropriate roodel of EPRCM (2732, 2716, etc)

allows a quick check of the board. It will usually :fOrce the data and address lines to toggle" at approximately the same amplitude, allowin;;J the technician to use a scope to spot affected lines.

I f the video display does not show a screen filled with alternatin;;J "g"ls and apostroJ;:hes, you have a problem in the video RAM or associated

circuitry.

You

can

check the main RAM and associated circuitry quickly with a scope by

lookin;;J at pin 14 on each of the RAM chips. There should be a pattern of signals like this:

For the 81-240 board: U212J (D7)

U21 (nG) U22 (Ds) U23 (D4) U24 (D3) U2s (D2) U26 (Dl)

U27 (00)

lC711

toggle toggle toggle

lC711

toggle

'!he U-mnnbers of the main RAM chips will vary dependin;;J on which mainboard you have, but the pattern will be the same.

(19)

~

1

S

-1 21.

J1c=J

1 UB :)

9)

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(20)

Ie LISr, IQ\YPR) 2 (81-lUJ-n) Reference Designation U1 U2,U67* U3 U4 U6, U11 U9,

uoo

U10, U61 U12, U14, U32 U15, U39

U16 throU;h U19 U20 through U27 U28 through U31 U33, U34

U35, U38 U36

U37, U56, U85 U41

U42 U43

U44, U45, U64, U65 U47

U48, U73 U49, U52, U62 U54, U72 U57, U58, U60 U59 U63 U66 U68 U69 U70

un

U78 U81 U82 U84 U86 U87 U88 74LS161 74InJ04 74LS290 74LS10 74LS393 74IS08 73IS32 741S74 74ISOO 74IS157 r-m6665 2114 74157 8216 74IS20 74IS02 745151 74IS174 81-146 74IS243 81-149 74IS04 74IS241

zoo

PIO 74LS138 74IS373

zoo

CPU

74164 1488 1489

zoo

SIO 74504 8116 7406 FD1793 74IS195 74IS293 74IS390 FOC9216 Description

4-bit counter

Hex inverter, CM:>S decade counter Tri NAND gates l)Jal binary counter

Quad AND gates

Quad OR Gates Dual "0" flip-flop Quad NAND Gates Quad 2/1 ~

( or equivalent) 64K x 1 RAM

lKx4RAM

Quad 2/1 MUX

Quad Bi-directional MUX

l)Ja1 NAND gates

Quad NOR gates

8/1 MUX

Hex "0" flip-flop

Character generator EPRCM

Quad bus trans

Boot EPRCM Hex inverter

Octal buffer

3/8 MUX

Octal "0" latch 8-bit shift register Quad line driver (our)

Quad SCHMIT!' line receiver (IN)

Hex inverter

l)Ja1 progranmab1e baud rate generator

Hex inverter, open collector Floppy disk controller

4-bit shift register 4-bit binary counter Dual decade counter

D3.ta separator

*NOrE: THERE ARE SOME VERSIONS OF THE 81-110 OOARD ON WHICll U2 AND U67 ARE WI' CMOO IC.S Bur ARE OORMAL TI'L ICS. READ THE NUMBER ON THE IC TO

BE SURE.

(21)

fn)(IE SIQ1ALS

ro

AID IN TlURifSIIOrDG (81-llB-n)

The examples of correct signals shown below do oot represent all of the signals on a Kaypro mainboard, since most signals will be simple high-low toggles. A group of video signals (CCf2J through CC3) are includErl as

illustrations of the timing relationships between the various video signals. Note that only one of the I/O signals on U57 will be low at any given time. State of the machine: The door of drive A is open: the machine is waiting to

boot.

The signal measurements were made using a Tektronix oscilloscope, model 2213. It has a bandwidth of r.c-6f2J MHz, sensitivity of 2mV/em, a sweep delay of f2J.l microseconds to 1 second, and a graticule display measuring 8 x lf2J em.

Signal Ml from pin 27 of the

cru

(U63)

was

triggerEd on. This signal is shown

in the top half of each display and was channell. Ground for the signals shown on channel 2 was established at first graticule line above the bottom of the display.

Each square of the representation is the equivalent of one square em on the graticule. The scope was set for 'N/div. for all figures,

am.

was

set for .5 micro-sees/dive for all figures EXCEPl' figure 6, which was taken using 1

micro-sees/dive

-Figure 1: Pin 6 of U63, 2.5MHz clock signal. Figure 2: Pin 24 of UB2, !MHz clock signal.

Figure 3: Pin 3 of U6, CCf2J. Figure 4: Pin 4 of U6, CCl. Figure 5: Pin 5 of U6, CC2.

Figure 6: Pin 6 of U6, CC3.

[image:21.617.69.531.336.756.2]

(22)

FIGURE 1

FIGURE 2

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FIGURE 3

FIGURE 4

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FIGURE 5

FIGURE 6

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(23)

SIQ1M, I,.al\TIQ1S Q1 MIW1B(JUI) 81-118-0

Ie

SIGllAL . LO:'A'l'iCN PIN NO.

-CI?U SIQ1AIS

2.5

MHz

U 63 6

·MREXJB U 62 16

ROB U 62 5

WRB U 62 14

MlHm' SIQ1AIS

RAS ·· .. U39· 11

~

U66

5

MUXC U66 4

VIDBO CUXI( SI<J!IMS

CLCCK, Y1 U 2 8

CC0 U6 3

CC1 U6 4

CC2 U6 5

(24)

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147

UF

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'MHi i')

u<.3

~B80 iSO CPU

2~ luSto.

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I

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A'.

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. - - - ' R S T

14'S<1O

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2

.(VISIONS

ION[ LTII. UfECT. Olsallll'TlOlf DAn ~o

& RfIlftlMol; ... !I SII. UrI( i-c' ~'Ir) -5,-U

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rw tJi~ VCRC rCU~D

81- 111

SHUT 2A

(25)

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Ie LIS'l', IQ\YPK) 2/4 (81-248-0) Reference Designation Description

---,---

,---Ul U2,U67 U3 U4 U6,U11 U9, UOO UUJ, U6l U12, U14, U32 U15, U39

U16 through U19

U20 through U27

U28 through U3l

U33, U34 U35, U38 U36

U37, U56, U85 U4l

U42 U43

U44, U45, U64, U65 U47

U48, U73 U49, U52, U62 U54, U72 U57, U58, U60 U59 U63 U66 U68 U69 U70

un

U78 U8l U82 U84

U86

U87 U88 74LS16l 74HCU04 74LS290 74LS10 74IS393 74LS08 73LS32 74LS74 74LSOO 74LS157 MCl16665 2114 74157 8216 74I.S20 74LS02 748151 74LS174 8l-l46-n 74LS243 8l-232-n 74LS04 74LS241

zoo

PIO 74LS138 74LS373 Z80 CPU

74164 OCl488 MC1489

zoo

SIO 74804 8116 7406 1793 74I.S195 74I.S293 74LS390 FTC9216 6-9 4-bit counter Hex inverter, <NOS Decade counter Tri NAND gates

Dual binary counter

Quad AND gates Quad

OR

Gates Dual "D" flip-flop

Quad NAND Gates

Quad 2/1 MUX

(or equivalent) 64K x 1 RI\M lKx4RAM

Quad 2/1 KJX

Quad Bi-directional MUX

Dual NAND gates

Quad

IDR

gates 8/1 MUX

Hex "D" flip-flop

Character generator EPR<M Quad bus trans

Boot EPRCM

Hex inverter Octal buffer 3/8 KJX

Octal "D" latch 8-bit shift register Quad line driver (0Ul')

Quad SCHMIT!' line receiver (IN)

Hex inverter

Dual progranmable

baw.

rate

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Hex inverter, open collector Floppy disk controller

4-bit shift register 4-bit binary counter

Dual decade counter

(30)

The examples of oorrect signals shown below do oot represent all of the

signals on a Kaypro mairtx:>ar:d, since most signals will be simple high-low toggles. A group of vide::> signals (a:0 through CC3) are included as

illustrations of the timing relationships between the various vide::> signals.

tete

that only ~ of the I/O signals on US7 will be low at arr.t given time.

State of the machine: with a blank, 2732, EPROM inserted in place of IX>rmal

EPROM at location U 47. The door of dr~ve A is open: the machine is waiting to boot.

The signal measurements were· made using a Tektronix oscillosoope, model 2213. It has a bandwidth of OC-6f2J MHz, sensitivity of 2mV/em, a sweep delay of f2J.I microseconds to 1 secald, and a graticule display measuring 8 x lf2J em.

Signal Ml from pin 27 of the CPU (U63) was triggered on. This signal is shown in the top half of each display and was channell. Ground for the signals shown on channel 2 was established at first graticule line above the bottan of the display.

Each square of the representation is the equivalent of one square em on the graticule. '!he soope was set for 'lV/dive for all figures, and was set for .5 micro-seeS/dive for all figures EX.CEPl' figure 6, which was taken- using 1 micrcrsecs/div.

Figure 1: Pin 6 of U63, 2.SMHz clock signal.

Figure 2: Pin 24 of U82, !MHz clock signal. Figure 3: Pin 3 of U6, CCf2J.

Figure 4: Pin 4 of U6, 0:1. Figure 5: Pin 5 of U6, CC2. Figure 6: Pin 6 of U6, CC3.

[image:30.612.65.538.324.760.2]

(31)

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(32)

SI<J!1AL r.crATIQiIS, 81-248-0

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(37)

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Reference

Designation Description

Ul 74874 Dual "0" flip- flop

U2 74808 Hex Schmitt Quad AND gate

U3 74804 Hex inverter

U4, U10 1489 Quad SQf.UTI' line receiver

US, U38, U41 74LS244 ectal buffer

U6, U2l, U24, U33, U49 74LS74 Dual "0" flip- flop

U20, U30 74LS08 Quad AND gate

U8, U37, US0 74I.SOO Quad NAND gate

U9, US9 74LS393 Dual binary counter

U11, Ul8, U3l, U4S, 74I.S373 O::tal "0' latch U46, U60

U12, Ul9 74LS138 3/8 MUX

Ul3 7406 Hex inverter, open collector

U14 74886 Hex Schmitt Quad XOR gate

UlS, U61 74820 Dual NAND gate

U16 8116 Dual progranmable baLD. rate

generator

U17 1488 Quad transmitter

U22 74LS16S 8bit shift. register

-U23, U27 ZOOA SIO

U25,

un

74LSl0 Tri NAND gate

U26 81-187 Olaracter generator EPRCM (2732)

U28 Z80A CPU

U29 74LS195 4-bit shi ft. register

U32, U43 74LS02 Quad NOR gate

U34 74LS14 Hex Schmitt inverter

U35, U44 6116 AAM, 2K x 8-bit (200ns)

U36 6545A-l Video controller

U39, U54 74LS245 Bi-directional 8-bit buffer

U42 81-302-C I3oc'&t EPRCM (2732)

U40 74LS32 Quad OR gate

U47, U48 74I.S157 Quad 2/1 MUX

U51, U52, U57, U58, U62, 4565N-15 Dynamic AAM 64K x 1 (150ns)

U63, U68, U69 (t-bstek number)

U53 74LS163 Synchronous 4-bit binary counter

U55 14-2-392 14-Pin pull-up resistor

U56, U65 74LS04 Hex inverter

U64, U67 74HCU04 Hex inverter, Q.1CS

U66 74LS93 Asynchronous 4-bit binary counter

U73 WD9216 Data separator

U74 1793 Floppy disk controller

(38)

The examples of oorrect signals shown here do not represent all of the signals

00 the 8l-l8a-n main1::x:>ard, since most of the signals will be high-low toggles.

A group of signals taken from a video clock divider (U66) are shown to

illustrate the timing relatiooships between the various video signals.

The signal measurements were made using a Tektronix ocillosoope, model 2213. It has a bandwidth of OC~ MHz, sensitivity of 2mV/em, a sweep delay of g.l microseconds to 1 second, arxl a graticule display measuring 8 x 19 an.

Fach square of the representatioo is the equivalent of ale square em. 00 the graticule. The scope was set fur 2V/div. and .2micro-secs/div. fur all

figures except figure 2, which was set at • Smicro-secs/div.

Signal HI from pin 27 of the CPU (U28) was triggered 00. This signal is shown in the top hal f of each display arxl was channell. GrourXl fur signals shown

00 channel 2 was established at the first graticule line above the bottom of the display.

State of the machine: The machine has just booted-up on the hard drive. Figure 1: Pin 6 of U28, 4MHz clock signal:

Figure 2: Pin 24 of U74, !MHz clock signal. Figure 3: Pin 12 of U66, video, clock divider. Figure 4: Pin 9 of U66, video, clock divider. Figure 5: Pin 8 of U66, video, clock divider. FigllI'e 6: Pin 11 of U66, video, clock divider.

(39)

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Reference

Designation Description

U1, US4 7406 Hex inverter, open oollector

U2, U2S, U71 74I.S14 Hex Schmitt inverter .

U3, US 1489 Quad Scmitt line driver

U4 1488 Quad line driver

U6, Ul3, U14,U55, U58 74I.S373 ectal "0" latch US 74I.S374 o::tal "0" flip- flop

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U42, U47, U48

U34 81-292 Boot PROM (2764)

U37, U4S, U59, U72 74I.S"2 Quad NCR gate

U40 74I.SOO Quad NAND gate

U43

ZOOA CPU

U44 1793 Floppy disk controller

U46 74I.S"4 Hex inverter

U52 74I.S32 Quad CR gate

U6" 74I.S195 4-bit shift register

U61 74t.S"8 Quad AND gate

U65 _74I.S1" Tri NAND gate

U66, U75 74I.S74 IAlal "0" flip-flop

U67 FOC9216 Data separator

U73 74HCOO Quad NAND gate

(48)

&XI?E SI<H\IS, 81-294-0

**********

Scope signals fur this mainboard will be available soon: the section will be sent to the dealers fur insertion into the new Technical Reference Manual as soon as it is available.

************

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