A2000 System Schematics, PN-314135-01

SYSTEM SCHEMATICS

A2000

AUGUST, 1990 PN-314135-01

C= Commodore

Produced By:
Commodore International Spare Parts GmbH
Braunschweig, West Germany

SYSTEM SCHEMATICS

A2000

AUGUST, 1990 PN-314135-01

INTERNATIONAL EDITION
COMMODORE “INTERNATIONAL EDITION”? SERVICE MANUALS CON-

TAIN PART NUMBER INFORMATION WHICH MAY VARY ACCORDING TO
COUNTRY. SOME PARTS MAY NOT BE AVAILABLE IN ALL COUNTRIES.

Commodore Business Machines, Inc.
1200 Wilson Drive, West Chester, Pennsylvania 19380 U.S.A.

Commodore makes no express or implied warranties with
regard to the information contained herein. The infor-
mation is made available solely on an as is basis, and the
entire risk as to completeness, reliability, and accuracy
is with the user. Commodore shall not be liable for any
damages in connection with the use of the information
contained herein. The listing of any available replacement
part herein does not constitute in any case a recommenda-
tion, warranty or guaranty as to quality or suitability of
such replacement part. Reproduction or use without ex-
press permission, of editorial or pictorial content, in any
matter is prohibited.

This manual contains copyrighted and proprietary information. No part
of this publication may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, electronic, mechanical, photo-
copying, recording or otherwise, without the prior written permission
of Commodore Electronics Limited.

Copyright © 1990 by Commodore Electronics Limited.
All rights reserved. Printed in U.S.A.

TABLE OF CONTENTS

TITLE PAGE
| — A2000 PCB ASSEMBLY .................. 0.0... cee eee 1

Il — A2052 RAM BOARD ASSEMBLY ........................ 17
lll — A2088 XT BRIDGE BOARD ........................0005 22

e4nocos

A2000 MAJOR PARTS LIST

1) Bezel, Front 380726-01
2) LED Holding Assembly 380709-01
LED Power On Assembly 380016-01
LED Hard Drive 380020-01
3) PCB Guide 251118-01
4) Panel, Expansion Slots 380739-01
5) Housing, Top 380727-01
6) | Housing, Bottom 380728-01
7) | Power Supply Assembly 380708-02
8) Chassis 380729-01
9) Drive Assembly — 5.25 ALPS 380111-06
Drive Assembly — 5.25 CHINON 380111-07 Sub: 06
10) Cover Floppy 5.25 380736-01
11) | Keyboard Assembly - HITEK 312716-02
12) | Keyboard Cable 380018-06
13) | Sub Chassis 380730-01
14) Standoff L=7MM 324271-06
15) Cover Floppy 3.5 380737-01
16) Drive Assembly — 3.5 PANA 380752-01
17) Cable Assembly — 5.25 Drive 380012-07
18) Cable Assembly — 3.5 Drive 380742-01
19) Foot, Cork 380128-01
20) PCB Assembly — A2000 NTSC 312720-01
21) — Insulation Sheet 312717-01
22) Bottom Shield 312719-01
Mouse Assembly 327124-03
Software Assembly 315818-01
PCB Assembly — 2088 PC XT Emul 380755-01
PCB Assembly — 2052 2MB Ram Exp 312365-01
PCB Assembly — 2090 Hard Drive Cntrl 311979-01

SERVICE PARTS
REFERENCE DIAGRAM

PARTS LIST

PCB ASSEMBLY #312720-01

PLEASE NOTE: Commodore part numbers are provided for reference only and do not indicate the availability of parts from Commodore. Industry standard
parts (Resistors, Capacitors, Connectors) should be secured locally. Approved cross-references for TTL chips, Transistors, etc. are available in manual form through
the Service Department, order part #314000-01.

INTEGRATED CIRCUITS

RESISTORS — All are carbon 1/4 watt, 5% unless noted

U100 MC68000 8 MHz 390084-03 RP502 22 OHM x 5 10 PIN 390227-03
U101 FAT AGNUS 8370 NTSC 318070-01 R102,RP201,] 47 OHM x 4 8 PIN 902422-05
U101 FAT AGNUS 8371 PAL 318071-01 203,R902,907
U200 PAULA 8364 252127-01 RP500,501 | 47 OHM x 5 10 PIN 390227-06
U201 DENISE 8362 252126-01 RP204 68 OHM x 4 8 PIN 902422-06
U102 GARY 5719 318072-01 RP205 120 OHM x 5 6 PIN 902441-10
U800 BUSTER 318075-01 RP503 470 OHM x 9 10 PIN 902410-11
U300,301 8520R4 318029-02 RP802 1K OHM x 5 10 PIN 390227-07
U500 ROM KICKSTART V1.2 315093-01 RP301,607 | 1K OHM x5 6 PIN 902441-22
U801 REALTIME CLOCK OK! 318073-01 RP800 1K OHM x 7 8 PIN 902442-22
MSM6242B RP601-605, | 1K OHM x 9 10 PIN 902410-10
U501-532 DRAM 256K X 115 NS 390026-01 700-704
U304 1488 901882-01 RP801 4.7K OHM x 7 8 PIN 902442-55
U305 1489 901883-01 RP100,101, | 4.7K OHM x 9 10 PIN 902410-08
U107 74F04 390110-01 200,705
U303 74F08 390092-03 RP600 10K OHM x 7 8 PIN 902442-35
U607,803 74LS08 901521-03 RP300,900 | 10K OHM x 9 10 PIN 902410-07
U302,606 74LS32 901521-31 901
U203 74LS38 901521-38 RP903,908 | 10K OHM x 5 6 PIN 902441-36
U108 74F74 390081-01 R914 1 OHM, 5%, “2W 901600-36
U802 74LS138 901521-16 R200,215 1 OHM 901550-118
U804 74LS148 901521-86 R207,208 10 OHM 901550-64
U202 74LS157 901521-11 R209,210 1.2K OHM 901550-17
U540,541 74F244 318050-01 R105,106, 22 OHM 901550-63
U205,206 74HCT244 318828-01 212
U103,105 74F245 390089-01 R310 47 OHM 5%, %2W 901600-15
U600,601, 74LS245 901521-46 R904,905 47 OHM 901550-56
602,603, R307 68 OHM 901550-94
604,605 R902 200 OHM 901550-31
U104,106 74LS373 901521-29 R110,111, 330 OHM 901550-14
U204 LF347/TLO84 390086-01 114,115
U805 LM339 318827-01 R230,240 360 OHM 901550-108
U805 LM2901 901523-01 sub: | | R234,244 390 OHM 901550-57
U900 74F00 318066-01 R801 ,803 470 OHM 901550-58
R233,243, 1K OHM 901550-01
312,601-605,

Q301 2N3904 NPN 902658-01

Q202,302 | 2N3906 PNP 902707-01 2.7K OHM 901550-23
Q200,201 | MPF102 JFET 390252-01 4.7K OHM 901550-19
Q200,201 | PN4302 JFET 390254-01 sub: | | 109,201,300,
Q300 2SC945 NPN JAP 902671-01 308,309,500,

806,807,916
R202,203,
206,211,214,
216,231,232,
241,242,305,
306,800,802,
804

R805
R204,205

10K OHM 901550-20

D400,401
D300,800
801,802

1N4001 900750-01
1N4148 900850-01

47K OHM 901550-22
470K OHM 901550-82

CAPACITORS

C810

C913
C245-261,
903-906,907,
908,914
C320,321
C310-316,
617,619-633,
635,637,639,
641,645,647,
649,650-652
654,655,657-
674,678,711,
713,714,716,
717,719,720,
722,726,728,
730,732,734,
736,738,740,
742,744,746,
748,750,752,
754,756,758,
760,762,764,
766,768,770,
776,778,780,
782,784,786-
788,790,791,
793,794,796,
910,911
C232,242
C231,241
C204,322,
323,401,407,
409,411,413,
414
C210-213
C110,234,
244,259,812,
815,900,901,
909,915,916,
918,919, 100-
108,200,202,
203,205,206,
218,300-303,
305,540,541,
600-607,800,
802-805
C201,215-
217,219-221,
500,700,702-
705
C501-532
C224,415,
811
C233,243,
317,318,701,
813,814
C222,223
402,404-406,
408,410,412
C402

C400
C214,225
226,912
C416-419
VvC800

20pF MLC AXIAL
47 pF MLC AXIAL
100pF MLC AXIAL

470pF MLC RADIAL
1000pF MLC RADIAL

3900pF MLC AXIAL
6800pF MLC AXIAL
.OluwF MLC AXIAL

047npF MLC AXIAL
1pF MLC AXIAL

.22uF MLC AXIAL

.33nF MLC RADIAL
4.7uF 35V ELEC RADIAL

22uF 35V ELEC RADIAL
47uF 16V ELEC RADIAL

47uF 16V ELEC AXIAL
100yF 16V ELEC RADIAL
470uF 16V ELEC RADIAL

470nF 16V ELEC AXIAL
VARIABLE 4.5-45pF

PARTS LIST

PCB ASSEMBLY #312720-01 (Continued)

900462-21
900462-29
900462-37

90001 4-05
900014-02

900463-23
900463-26
390082-02

900463-36
390082-01

390082-05

900022-05
390101-05

390101-04

390101-01

390188-05
390101-02
390101-03

390188-09
251029-06

MISCELLANEOUS

EMI200,201,
206-208,210,
211,229,300-
321,325-338
FB101,201-
215,301-303,
401,903
FB900,901
902

EMI209
J101,200
300,301,900
HY

U102,200
201,800
U102,200,
201,800
U100
U101
BT800

EM! FILTER 100pF

FERRITE BEAD

FERRITE BEAD, 1.5 TURN

EMI FILTER

SHUNT FEMALE 2 POS
0.100

VIDEO HYBRID

OSCILLATOR 28.63636 MHz
OSCILLATOR 28.37516 MHz

CRYSTAL 32.768 kHz
40 PIN DIP SOCKET

48 PIN DIP SOCKET
48 PIN DIP SOCKET

64 PIN DIP SOCKET

84 PIN PLC SOCKET

BATTERY NICAD 3.6V
60MAH

POWER SWITCH

CONNECTORS

CN203,207,
704,705
CN706,707
CN700,701,
702,703
CN600
CN601,602
603,604,605
CN300

CN200
CN200
CN201
CN201
CN202
CN202
CN302
CN302
CN305
CN305
CN301
CN301
CN205
CN204
CN206
CN201,302
CN201,302
CN400

J301,900
J101,200,300
CN306
CN606
CN304
CN303

36 PIN

36 PIN (OPTIONAL)
62 PIN

86 PIN
100 PIN

DIN 5 PIN SHIELDED
FEMALE

D-SUB 9 PIN MALE PCB
D-SUB 9 PIN MALE PCB
D-SUB 9 PIN MALE PCB
D-SUB 9 PIN MALE PCB
D-SUB 23 PIN MALE PCB
D-SUB 23 PIN MALE PCB

D-SUB 23 PIN FEMALE PCB
D-SUB 23 PIN FEMALE PCB

D-SUB 25 PIN MALE PCB
D-SUB 25 PIN MALE PCB

D-SUB 25 PIN FEMALE PCB
D-SUB 25 PIN FEMALE PCB

RCA JACK, WHITE

RCA JACK, RED

RCA JACK, YELLOW

SCREW M3 x 0.5 x 10

NUT M3 x 0.5

14 PIN SIL .156 KEY 10
LOCK

2 PIN SIL .100

3 PIN SIL .100

3 PIN SIL .100 RA

4 PIN SIL .100

26 PIN DIL .100

34 PIN DIL .100

251842-02

903025-01

390253-01

390257-01
390043-01

390229-01
325566-14
252344-01
900560-01
904150-06

251313-01
251313-02

904150-01
390185-01
380393-01

C390265-01

903446-04

903446-04
903446-02

903446-05
903446-06

903362-01

390242-01
390242-02
327032-07
327032-01
390242-03
390242-04
327033-04
327033-03
390242-05
390242-06
390241-05
390241-06
252122-01
252122-02
252122-03
906800-02
905960-03
903328-14

903326-02
903326-03
903374-03
903326-04
903345-13
903345-17

A2000 PCB ASSEMBLY
PCB ASSEMBLY #312720-01
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A2000 PCB ASSEMBLY
SCHEMATIC #312721
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A2000 PCB ASSEMBLY
SCHEMATIC #312721
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SCHEMATIC #312721
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A2000 PCB ASSEMBLY
SCHEMATIC #312721
Sheet 8 of 13

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A2000 PCB ASSEMBLY
SCHEMATIC #312721
Sheet 9 of 13

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XCLK

ALI
330

(FLOPPY FUNCTIONS)
(CONTROL FONCTIONST|

Mil

A2000 PCB ASSEMBLY
SCHEMATIC #312721
Sheet 10 of 13

—<T_ovA
ove

—<OXAROY

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(>_CLKWA

Je WE
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SIDED

A2000 PCB ASSEMBLY
SCHEMATIC #312721
Sheet 11 of 13

‘A3OL
1K
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A2000 PCB ASSEMBLY
SCHEMATIC #312721
Sheet 12 of 13

<ORAWLEFT
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A2000 PCB ASSEMBLY
SCHEMATIC #312721
Sheet 13 of 13

A323)
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ZNSWBHN

COMPONENT PARTS LIST

Ui, U2
U3, U9
U4

U5
U13
U10
U6, U7
Ui1
U12
U14
U8
U15-U78

RN2

RN1

RN3-RN5, RN7, RN10
RN8, RN9

RN11, RN12

Ci-C7, C10-C15
C16-C55
C8, C9

Ji, J2
J1, J2 sub:

A2052 2MB RAM BOARD ASSEMBLY

IC 74F245
IC 74F32
IC PAL 16L8A

‘IC PAL 16L8A

IC PAL 16L8A
IC PAL 16L8

IC 74F258

IC 74LS04

IC 74LS374

IC 74F521

IC 74F244
DRAM 256K X 1

1K X 7 SIP, 8 PIN PULL-UP
1K X 9 SIP, 10 PIN PULL-UP
22 X 4 SIP, 8 PIN

22 X 5 SIP, 10 PIN

4.7K X 9 SIP, 10 PIN

.22uF .2"” CERAMIC BYPASS
.383yF .2” CERAMIC BYPASS
22uF 35V RADIAL ELECTROLYTIC

2 PIN HEADER .1”

2 PIN HEADER .1”
EXTENSION CARD PANEL
M-3 SCREW X 4.0 LG

390089-01
390077-01
318055-01
318056-01
318057-01
318054-01
318052-01
901521-02
901521-43
318041-01
318050-01
390226-01

902442-22
902410-10
902422-04
390227-01
902410-08

315034-01
315034-02
390101-04

903345-01
903326-02
380120-08
906800-01

A2052 RAM BOARD ASSEMBLY
PCB ASSEMBLY #312365-01

APR ULITTNTD

GIGDGDGDG DGD DIG)

UUW UU

mt NNN

A2052 RAM BOARD ASSEMBLY
SCHEMATIC #312366
Sheet 2 of 5

AMIGA EXPANSION BUS Rast >
160 PIN EDGE CONN. i

DD,

DDDDVDDD

[> AS (0: 3)
[> WAL (0: 1)
[> _WRH (0: 1)

US uu
PALIG6L8A PALI6LBA RNY

L>_CAS ( (8:2)

MEMORY CONTROL AND DATA BUFFERS

18

A2052 RAM BOARD ASSEMBLY

SCHEMATIC #312366
Sheet 3 of 5

L>AMA (0: 8)

:8)

L>BMA (0

MNO Se
acacacacacc

vcc

i 1Kx7 SIP
Ss ss ee

eee ee ee eee © Se Ee ©
| re
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74LS374

(\
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7HLSO4

PAL16L8

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—CONF I1GOUTL>

P=-0ms'ixoMx<
wecent aren
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MUXS AND AUTO-CONFIG

ADDR.

MPONENT

ae

OHPONENT
13

E

fealied

OHPONENT
16

E

19

A2052 RAM BOARD ASSEMBLY
SCHEMATIC #312366
Sheet 4 of §

XX256-15

XX256-15 — XX258-15 _ XX256-15 pass Xx256-15 -XX256-15 P2888 XX256-15 XX256-15 XX2SE-15.XKZS6-15 —-XK25B-1S —-XKZSE-1S -KX2SB-1SHNZSE-1
1 1 L 1

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ier Fy: :
AMA (0:8) [> i " i _
or
BMA (0: 8) C> 2MB ARAM ARRAY
—WRH (0: 1) C> E
—_WRL (0: 1)
_RAS (0:3) >

COMPONENT

COMPONENT

COMPONENT
uuo

COMPONENT
uss

COMPONENT
uss

COMPONENT
us

COMPONENT
u28
Guo

COMPONENT
ual

COMPONENT
usa

COMPONENT

COMPONENT

ui?
cwo

COMPONENT
veo

COMPONENT
uss

COMPONENT

COMPONENT
us
GND

COMPONENT
usB
GNO.

COMPONENT
uu
Guo

COMPONENT

COMPONENT

COMPONENT

COMPONENT

COMPONENT

COMPONENT
us?

COMPONENT

COMPONENT

COMPONENT
u32
Guo

COMPONENT
UNS
Guo

CONPONENT

COMPONENT

COMPONENT
u2t
Guo

COMPONENT
uss
EHO.

COMPONENT

COMPONENT

COMPONENT

COMPONENT
ue2
6x0

COMPONENT
u34
ENO.

COMPONENT
uu7z
NO.

COMPONENT
use

u73
NO

COMPONENT

A2052 RAM BOARD ASSEMBLY
SCHEMATIC #312366
Sheet 5 of 5

vcc

COMPONENT
u23

COMPONENT
van
Guo.

COMPONENT COMPONENT

U26

COMPONENT
u3s6
Guo

COMPONENT COMPONENT
uss

COMPONENT
uss

i
COMPONENT
uss
a

Cl

COMPONENT
u7s

COMPONENT
uss
GxO

COMPONENT COMPONENT

COMPONENT COHPONENT
Use USI
suo oo

uus
Guo

COMPONENT
U61
fa]

COMPONENT

COMPONENT
uss
Guo

COHPONENT

vet

COMPONENT COMPONENT COMPONENT COHPONENT
u77

21

EZNS HO &

PARTS LIST

PLEASE NOTE: Commodore part numbers are provided for reference only and do not indicate the availability of parts from Commodore. Industry standard
parts (Resistors, Capacitors, Connectors) should be secured locally. Approved cross-references for TTL chips, Transistors, etc. are available in manual form through
the Service Department, order part #314000-01.

INTEGRATED CIRCUITS CAPACITORS

U40 ADDRESS BUS TRANSL. 380658-01 C52 CER RADIAL 47pF 251070-18
U41 DATA BUS TRANSL. 380659-01 C55,61,62 | CER RADIAL 100 pF 251070-22
5718 C71,72 CER RADIAL 470 pF/S50V = 251071-30
U1 8088 380200-01 C3-6,8-11 CER RADIAL 0.1pF 900020-01
U2 8087 380201-01 C1,2,7 CER RADIAL 0.22uF/50V 900022-01
U29 PAL RAM DECODER 380783-01 53,54,60,70
EMULATOR C56-59 ELECTR. AXIAL 47pF/25V 900100-27
U50 PAL I/O DECODER 380784-01
U39 PAL CONFIGURATION 380785-01
U7 FE 2010 380786-01 eos

U1227 | _DRAM 256K X 1, 150 nS 38022301 Bees ae
U32-35 | DRAM64KX 4, 150nS 38025601 Cee oem: Sener D

U42 FDC 9268 380787-01 Quit UARZ 14.31818 MH 900558-01
U28 BIOS PC-EMULATOR — 380788-01 28 aE Aaeeee
U10,11 74 HCT 158 380227-04 U20-27 SOCKET 16 PIN 904150-02
U36,37 74 HCT 257 380227-58 U29,50 SOCKET 20 PIN 904150-08
U43,44 7406 901522-06 U1,2,42 SOCKET 40 PIN 904150-06
U45 74 LS 08 901521-03 U7,40,41 | SOCKET 84 PIN 380789-01
U46 74 LS 14 901521-30 U39 SOCKET 20 PIN 904150-08
U47 74 LS 125 901521-20 SCREW, PAN HEAD 906800-03
U38 74 LS 133 901521-15 M3X8

U48 74 LS 164 901521-28 LOCKWASHER EXT. 905652-04
U49 74 LS 175 901521-34 TOOTH. 0 3.2 MM

U8,9 74 LS 244 901521-13 NUT HEX M 3 905960-03
U3,30,51 74 LS 245 901521-46 RIVET DOME — Sub. for above three items

U4-6 74 LS 373 901521-29 D PANE
U31 DIGITAL DELAY LINE § 324667-01 pipes eee

a
JUMPER RM: 2.54 MM 380333-01
BC-327 B 324219-01 WIRE JUMPER 903781-01
HEADER ASSY DUAL 903345-03
HEADER ASSY DUAL 903345-17
RN9 902417-03 ROW .100CTR.
RN10 902410-08 23 PIN SUB MINI 327033-01
RN1,2,11 902412-05 “D” FEMALE
RN3-8 902422-07 23 PIN SUB MINI 310975-01 sub:
R7,8 901550-105 “D” FEMALE
R3,5 901550-49 HEADER ASSY SINGLE 908326-02
R1,10,11 901550-01 ROW .100CTR.
901550-18 HEADER ASSY SINGLE 903326-08
901550-19 ROW .100CTR.
901550-84

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A2088 XT BRIDGE BOARD
SCHEMATIC #380756
Sheet 2 of 9

I> 409-7
CEeiD> 800-7

(SRD BA6-/9

Cla

BHE/ST

8087

74LS 373

SS A6-449

(30> NANT

A2088 XT BRIDGE BOARD

SCHEMATIC #380756
ino2 (“3D Sheet 3 of 9
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STARTUP INTR CS > PG
VIDEO > InTR

move [1]

NCTES: VIDEO STARTUP TABLE

4 Jl Jl J
I-3 3-5 2-4 4-6

Hono OPEN OPEN | CLOSED
COLOR 40x25} OPEN
COLOR 80x25 | CLOSED OPEN | CLOSED
NONE CLOSED CLOSED

V'DEO STARTUP
ode

BA @-19
C7 >

A2088 XT BRIDGE BOARD

SCHEMATIC #380756
Sheet 4 of 9

+5SV
U13 U14 U15 U16 U17 U18 U19 vo |4
8x Qudd
BANK Q t, 46 ci2-19
8x DRAM
256K x1
SV
U21 U22 U23 U24 U25 U26 U27 % I
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DI__ Do
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kx
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RANE (>>

13 [I> fiREN ShenRC3>

27128 / 23128
PAL16L8

BD¢g -4F

A2088 XT BRIDGE BOARD

SCHEMATIC #380756
Sheet 5 of 9

+5V :
9 ta * = (> 0RG2
~t “i>
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# 8] 16 Mwe my KE NC
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U43 ” 6 TROe +5V
4i2V
Res CE>
set Ci 13 Doi esse 7 —r> FEET
NOTES: [2] ate apo pws of 3 [2] wire super — [3] wire sumrer
CONNCTED TO GND NORMALY OPEN NORMALY CLOSED
[2 we werre Precon.
SELECTION. DEFAULT 15 250ns

A2088 XT BRIDGE BOARD
SCHEMATIC #380756
Sheet 6 of 9

eee cay MAl-23

2 DRAM ©4Kx4 Z DRAM .64kx ¥

\ D2 Cr Mee

[oop RNE
mae FT)

12

To LS 133
U38

RRS? E>

ROG-/S <EIS>

a pe a as SS oe a ee ee ee

CONFIGURATION

She <} | 1G U39

RE(ONAG SA)

‘owrie.our <t_] <x] MRI

7 7 <3) MReser
<2] Auds

| eae

) EXT. PAL
ONLY USED IF CONFIG-EN
JUMPER OPEN (JA1)

27

BAP-/9 CZ>

RWE <e
RM <td
eH

TEST

CONNECTOR

JF

Rg-% <<

A2088 XT BRIDGE BOARD

SCHEMATIC #380756
Sheet 7 of 9
49t5Y
| RN
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Pe yi
5
28 <x baliv
ripe 2 Ss] RESET
zl ign pe ee eer ae
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| 1? C3 > INT2
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4+} 4] a4 <1] A6ak _
2 ef TRANSLATOR mn <1 AGBKWR
aI (ev > A68KEN
ag ee z ES Ten
IS Di
4 32 [> R3ISEN

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Key
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(o> “LPT Busy

<a) MAI-23

<EX> RO-IS

A2088 XT BRIDGE BOARD

SCHEMATIC #380756
Sheet 8 of 9
Myg-ls <=> <1 MA/-23
Sy waste S >
= = <
28 0
TDEN Cz> 52 — | 39 7
Cz > HAI) cy KI
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7 <3) UD.
== 36 #0 ee
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RSTSEN CF > 34
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Sv
on DATA BUS
ae mee conrigzew |CONFIG.RR igi aay
one . TRANSLATOR io see
< Ty |
amr i]
Pity, WIRE JUMPER
amy
= 5718
BORO.SEL <I
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HUT.VP <_& > 46] Sqat-uP 43
CONFIG. OU? <a > 45 50 2) BIORC
FRE.CONFIG <_&_> 47] pape con sI <3 BAEN.
<3] $MEMR
we is -

NOTES: WIRE JUMPER NORMALLY CLOSED.
IF CLOSED, Contig PAL INTERNALLY OF
UY 18 USED, 39 HUST NOT BE WSERTED
IN THIS CASE.

MA1-23 <Saz)

MD6-I5 <~¥>

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CARD EDGE
100 pol.
8 <a) rz
TAS zs is <a>) xrpy
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: RESET

NC TT JS Ey

124,13, 25,37
| 33,100 _—«t oe

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Nr 31, 33,35
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i 46,48, 50 nc.

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: bo, 93,45

%, 97,38

sae ae ee
I IT

Sxttu/eV 140.224 2Hx 0.44
C56-58 034

1

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63-6, C8- cH c59 C60
C30, 636, 037-38

C43 -49, 654

+5V +12¥ es ge rr

SPARE:

BRESET (“3

0.22% “Ter +5V J
TRQ2
loop Toe, ne ——-.

DRad <<
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DRQ1
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Beck C3a>
RQ?
RQb
IRQS
IRQy
IRQ3
BDACK2 (3 >
Te Cz>
BALE C3>

100» = C63

100p = bY

0p == C65
~~ 1000p == C66
100» == C 6
100p == C68
100 == 663

t5V J

Bosc CZ > Re (__}
33

A2088 XT BRIDGE BOARD
SCHEMATIC #380756
Sheet 9 of 9

uy YG 7906

U4? % 7MLS125

CARD EDGE
2x 31 pol.

(> ITocncK
8D?

<I——> BDO-7

Ww

[> locuroy

<7] BAEN
BA !9

NN

C2) BAO-9

SNSOQAS

COMPONENT PARTS LIST

A2090 HARD DISK CONTROLLER PCB ASSEMBLY

PLEASE NOTE: Commodore part numbers are provided for reference only and do not indicate the availability of parts from Commodore. Industry standard
Parts (Resistors, Capacitors, Connectors) should be secured locally. Approved cross-references for TTL chips, Transistors, etc. are available in manual form through
the Service Department, order part #314000-01.

INTEGRATED CIRCUITS RESISTORS (continued)

20L10 PAL 390235-01 901550-69

20L10 PAL 390234-02 901550-49

20X8 PAL 390231-01 901550-89

16L8 PAL 39023301 || R23 901550-40

16L8 PAL 390236-01 | | R819,9,1,11 | 1K 901550-01

16L8 PAL 390232-02 || R17 1K 1/8W 1% METAL FILM 3901 70-05

16R6A PAL 39023701 || R7 2K 901550-53
U14,15,31 | 74LS245 390001-01 || R12 4.75K 1/8W 1% METAL FILM 390170-06
U47 74F245 390089-01 | | R6,10 10K 901550-20
Ua4 74LS74A 390097-01 || R18 10M 901550-09
U18 74F74 390081-01 || R20 1.2K 901550-17

74F86 390198-01 901550-14

7407 390002-01

74LS04 901521-02

74LS08 et a 03

8727 CBM DMA 15046-01 :

74F521 8 BIT COMPARATOR 318041-01 || Sa'sueve, | “IMF SOV 20% CERAMIC POO0EO-0T

74.374 901521-43 | | 23:28:38-54,

7ALS244 901521-13 33MF .2" 50V 20% CER 900020-09

74LS273 390158-01
.001MF 50V 10% CER 900014-02

26LS31 DIF TRANS 318040-01
26LS32 DIF RECR 318043-01 a a 900014-04

DP8465N-4 DATA SEP 390207-01
{MF 35V 10% TANTALUM .1” 900402-13
ren Le anne ectere dl 10MF 20V 10% TANTALUM .1” — 900402.09
a NOW Coe. eee 22pF 50V 10% MONOICER .1” 900019-13
Sy aioe 39pF 50V 10% MONOICER .1” 900019-14
‘ is ) sonsoan: || c Q5pF 300V 1% MICA .1” 900050-27
Loire repr 390pF 50V 5% CER .1” 900019-23
1 1 100pF 50V 10% DIP CER .1” — 900019-15

74LS76 901521-61
74LS174 30075601 224 25V ELECTROLYTIC 390101-04

DDU-6-60 DELAY LINE 324667-02
74LS00 901521-01
49 WD39003 SCSI eonoe oi
0206-01

: SOCKET z BIN 6 CENTER 04 1z004

KET 24 PIN . 904150-04

TRANSISTORS SOCKET 24 PIN .3 CENTER 390060-01

2N3906 902707-01 SOCKET 40 PIN 904150-06
SOCKET 48 PIN 251313-01
[pons SOCKET PALO, SOU
CRYSTAL 20 MHz PARALLEL 900556-09
CRI 1N914 390017-01 MODE

RESISTORS — All are carbon 1/4 watt, 5% unless noted

RN1,2,3 1K SIP 10 PIN, 902410-06 20 PIN DUAL IN-LINE HEADER 903345-10
PIN 1 COMMON 0 34 PIN DUAL IN-LINE HEADER 903345-17
RNG 3.3K SIP 10 PIN, 902410-06 25 PIND TYPE CONNECTOR 390241-06
PIN 1 COMMON 50 PIN DUAL IN-LINE HEADER 903345-25
RN4,7,5 220/330 10 PIN SIP 380388-04 2 PIN DUAL IN-LINE HEADER 903345-01
RNB 220/330 6 PIN SIP 380388-01 EXTENSION CARD PANEL 380120-09

Ri5 1.3K 901550-32

A2090 HARD DISK CONTROLLER
PCB ASSEMBLY #311979-01
Sheet 1 of 11

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A2090 HARD DISK CONTROLLER
SCHEMATIC #311980
Sheet 2 of 11

[> HD (0: 7)

Se

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isa" & :

cs! a4 04 _WRCBP/_INTACKES Rares [> _INTP

a EBUSACKL> oe 2 a ee

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OMA LOGIC AND ADDR. COUNTERS

A2090 HARD DISK CONTROLLER
SCHEMATIC #311980
Sheet 3 of 11

68000 EXPANSION
BUSS INTERFACE

100 PIN EDGE CONN.

C>AD (0:15)

Ui

7HLS2US

Faig
NE
[>vCC +5 pptt
LOCAL_OWN :
SLAVE CONFIGIN | B03 2 Jie? LOCAL_OWN
_CONFIGOUT C3 PD8 qd U16
cDAC TC1 °
INTe PALI6RE => _BUSACK
Ae —DMAEN 2
GACK
Ae THLS2uS BUSES [> -8
PD? 1 Bivs -
3 ait 2 Ba _BcACK
BBS 3 eae Be
pD2 8 Bqis _BR
PDI 7 By2
_BERR PDO 8 Ba
7 U17
: <J]_BUFEN
A MRE
8 —Back <IDIR Be
_DELMRE
ACK R7
i _Dnae
; SLAV
_BUSAC
i ELBA
L> _RESET _DELBAS
_ODELBAS
7M

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x hs 68000 EXPANSION BUSS INTERFACE
COMPONENT |__| COMPONENT

A2090 HARD DISK CONTROLLER

SCHEMATIC #311980
Sheet 4 of 11

US

<JHD (0: 7)
74HLS374
D1 Q
D2 Q
D3 Q
D4 Quy
bCLK
DS Q
DS Q
D7 Q
408 Q6
WRCBP/_INTACK_>
INTFL>
INTPL>
INTEN<_]
1Y
1y
1Y
ly
2Y
eT
ey
ayy
_RDSTATIC>
_ROSTATOL>
AD (8:15) L>
_WRSTATOL> <] A1/02
-RESETL>

AUTO CONFIG

<—_DDELBAS

FCeL>
—SLOTSELL>
_DELBASL>

U7
a AD15
A Apia
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a sa
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CBA
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A2090 HARD DISK CONTROLLER
SerSheot Sof 17

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INTP
c

68000 AUTO-CONFIG HARDWARE

A2090 HARD DISK CONTROLLER
SCHEMATIC #311980
Sheet 6 of 11

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8 220/330 2207330

8 = RNB = RNS

SCSI CONTROLLER

A2090 HARD DISK CONTROLLER
SCHEMATIC #311980
Sheet 7 of 11

KA (0:15)

STSG6 CONTROLLER

_RWELS

37

A2090 HARD DISK CONTROLLER

SCHEMATIC #311980
vec ee Sheet 8 of 11
. F
7 |, 7uLs2uu wal le 74LS273
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A2090 HARD DISK CONTROLLER
SCHEMATIC #311980
Sheet 9 of 11

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a [> _KRE

Pros tna] [>AI02
7 [>_PCSS
[>_PCSD
[>_HWRI
[>_HRDOI
[>_KWE
[>AIOL

KSEL

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C>_CHPRST

HD (0: 7) L>

(A (0; 15)

DB (0:7) >
LOCKDETCS
MISSCLKL&
NRZDATAC>
READCLKL>
MFM12C>
MF M24C>
XTALINCS
_—RFSHC>
_MRQC>
_WRES
_RDC>
_IORQL>
MFMIN1IC>
MFMINOC>
—HWRIC>
—HRDICS
—CHPRSTC>
XDINC>

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A2090 HARD DISK CONTROLLER
SCHEMATIC #311980
Sheet 10 of 11

[>_ENROM
L>_RCS
[>DMA
C>_INTROQ
C>_IOWR1
[>_IOWR2
[>_IOWR3
C>_IOWRY
L>_XOE
[>_RWE
[>CLK
L>10-20Mhz
[>ROGATE

C>WRGT
C>_WFLT
[>_IDX
[>_SELADR
[>SPARE
[>SCSIBUSY
C>_CWAIT
[>MFMO
[>PUP 1
[>WROATA
[>EXTRA
C>_SEL

A2090 HARD DISK CONTROLLER

vec SCHEMATIC #311980
Sheet 11 of 11
a ts
sé = = et
1uF
afi 168
= 4 2 bra ticdl
C36
re ie Ais
zoe 2505
VCC = C22aS
wT ub . é
ni2__ has eb 2 fq s |e [>NRZDATA
PG2 PGL PG3 IRSET IBSET CPOUT C1 C2 ACVD [>READCLK
28 I 2 - 14
19-20Mhzt>——_f-—smeae"” = OPBUBS wear t _ ULsee
| -——Sjrenv-care CLOCK
RDGATELO U39 iad SLOCK-DETECTED 2) s —T>MISSCLK
Vec Gnd DELAY-DISABLE 2/0-PREAMBLE SET-PLL-LOCK Ss Ter
2 18
vee - os [>_LOCKDET
PUP1C>
vcCc
[>MFM12]
MEMOCD> 1 [>MFM2u

DDU-6-60

20Mhz

41

C= Commodore

Computer Systems Division
1200 Wilson Drive
West Chester, PA 19380