SYSTEM SCHEMATICS

A2000

REVISION 6

AUGUST, 1989 PN-314135-02

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 expressed or implied war- ranties with regard to the information contained herein. The information is made available solely on an as is basis, and the entire risk as to quality and accuracy is with the user. Commodore shall not be liable for any consequential or incidental damages in connection with the use of the information con- tained herein. The listing of any available replace- ment part herein does not constitute in any case a recommendation, warranty or guaranty as to quality or suitability of such replacement part. Reproduction or use without expressed 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, photocopying, recording or otherwise, without the prior written permis- sion of Commodore Electronics Limited.

A2000 SYSTEM SCHEMATICS

TABLE OF CONTENTS

TITLE PAGE Parts List PCB Assembly #312720, Rev. 6 ....... cc ceeec ccc cec cece eeeees 1 Board Layout PCB Assembly #312723, Rev. 6 .......... cece cece cece eee eeee 3

Schematics: #312721; REV: 650-0 ccwsewiew ued cea kee esa Ve eawauweh etvesaules 4

A2000 SYSTEM SCHEMATICS

COMPONENT PARTS LIST PCB ASSEMBLY #312720, REV. 6.0

312720-05 PCB ASSY, A2000CR NTSC 312720-06 PCB ASSY, A2000CR PAL

Commodore part numbers are provided for reference only and do not indicate the availability of parts from Commodore. Industry seadard 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 #314000-01.

RESISTORS 5% @1/4 WATT, unless otherwise noted (Continued)

MC6800, 8 MHz U100 901550-56 | 47 OHM R904,R905

SUPER AGNUS, 8372 R307 PAULA, 8364

DENISE, 8362

GARY, 5719

BUSTER, 5721

8520R4

ROM, KICKSTART V1.3

REALTIME CLOCK, OKI MSM6242B 1488

1489

DRAM, 256K X 4, 120 ns

R308 R110,R111,R114,R115,

R311,R312,R601-R605, R800,R900

R209,R210

R213

R990 R101,R104,R109,R201, R300,R309,R500,R806, R807,R902,R916 R202,R203,R206,R211, R214,R216,R231,R232,

U205,U206 MUST BE USED WITH RP904-RP906 U103,U105 U600,U601,U603,U604 U602,U605

U104,U106

U204

U805

SUB: U805

U900

U300,U301,U500 U102,U200,U201,U800 SUB: U102,U200,U201,

C908,C913 259-261,C304,C306, €903-C905,C907,C914, C920

C320,C321 C310-C316,C617,C619- €633,C635,C637,C639, C641,C645,C647,C649- 652,C654,C655,C657-. 674,C678,C711,C713, C714,C716,C717,C719, C720,C722,C726,C728, C730,C732,C734,C736, C738,C740,C742,C744, C746,C748,C750,C752, C754,C756,C758,C760, C762,C764,C766,C768, CT10,CT76,CT78,C780, C782,C784,C786-C788,

900014-05 | 470 pf, MLC, AXIAL 900014-02 | 1000 pf, MLC, AXIAL

22 OHM X 5, 10 PIN 47 OHM X 4, 8 PIN

47 OHM X 5, 10 PIN 68 OHM X 4, 8 PIN 120 OHM X 5, 6 PIN 470 OHM X 9, 10 PIN 1K OHM X 7, 8 PIN 1K OHM X 5, 6 PIN 1K OHM X 7, 8 PIN 1K OHM X 9, 10 PIN

C204,C322,C323,C401, C407,C409,C411,C413, C414

C210-C213 C100-C108,C110,C200, 218,C234,C244,C300- C303,C305,C540,C541, 805,C812,C815,C900, €901,C906,C909,C910, C915,C916,C918,C919 €201,C215-C217,C219- €221,CS00,C700,C702- C705

C501-C508 C224,C415,C811

3.3K OHM X 5, 6 PIN 4.7K OHM X 5, 6 PIN 4.7K OHM X 9, 10 PIN 4.7K OHM X 9, 10 PIN

RP100,RP101,RP200, RP705

10K OHM X 7, 8 PIN RP600 10K OHM X 9, 10 PIN RP300,RP900,RP901

RESISTORS 5% @ 1/4 WATT, unless otherwise noted

901600-36 [1 OHM, 5%, 4 WATT R914 R200,R215 R207,R208 R105,R106,R212 R310

.22 uf, MLC, AXIAL

.33 uf, MLC, RADIAL 390101-05 | 4.7 uf, 35V, ELEC, RADIAL

901600-15 | 47 OHM

A2000 SYSTEM SCHEMATICS

COMPONENT PARTS LIST

PCB ASSEMBLY #312720, REV. 6.0 (Continued)

26 PIN, DIL, .100 CN304 34 PIN, DIL, .100

CAPACITORS (Continued) 390101-04 | 22 uf, 35V, ELEC, RADIAL

C233,C243 ,c3 17,C3 18, C701,C813,C814

293, : SHUNT, FEMALE, 2 POS, 0.100 J101,3200,5300,J500, 47 uf, 16V, ELEC, AXIAL Caos’ C410,C412, C420. ai es SHUNT, FEMALE, 2 POS, 0.100 J101,5200,5300,5500, C400,CA16-C419 phd 220 uf, 16V, ELEC, AXIAL 214,C225,C226,C912 36 PIN CN203,CN207,CN706,

470 uf, 16V, ELEC, RADIAL VARIABLE 4.5-45pf POSITIONS LEFT BLANK

36 PIN

62 PIN 86 PIN 100 PIN

36/62 PIN

DIODE, 1N4001 DIODE, 1N4148

390254-01 | TRANSISTOR, PN4302, JFET 902671-01 | TRANSISTOR, 2SC945, NPN, JAP

VIDEO HYBIRD OSCILLATOR, 28.63636 MHz OSCILLATOR, 28.37516 MHz CRYSTAL, 32.768 KHz

PCB FUSE

SCHEMATIC

PCB FABRICATION ARTWORK

EMI FILTER, 100pF

327033-04 | D-SUB, 23 PIN, FEMALE, PCB is 327033-03 | D-SUB, 23 PIN, FEMALE, PCB CN302 EMI211, E 390242-05 | D-SUB, 25 PIN, MALE, PCB CN305 eS ERae 390242-06 | D-SUB, 25 PIN, MALE, PCB CN305 390241-05 | D-SUB, 25 PIN, FEMALE, PCB CN301 EMI FILTER, 330pF coperreerpets 390241-06 | D-SUB, 25 PIN, FEMALE, PCB CN301 RCA JACK, WHITE CN205 LEFT AUDIO EMI FILTER, 6800 pF rr aie 252122-04 | RCA JACK, BLACK CN204 RIGHT EMI FILTER, 100pF W/FERRITE EM1208,EM1311- EM1321

252122-03 | RCA JACK, YELLOW 906800-02 | SCREW, M3 X 0.5 X 10 905960-03 | NUT, M3 X 0.5

FERRITE BEAD FB101,FB215,FB301-

FB303,FB401,FB907

14 PIN, SIL, .156, KEY 10, LOCK FERRITE BEAD FB102 903326-02 |2 PIN, SIL, .100 J301,3500,5900 FERRITE BEAD, MEDIUM FB216-FB221,EM1202, 903326-03 |3 PIN, SIL, .100 J101,5200,3300 FB900-FB903 BATTERY, NICAD, 3.6V, 6OMAH BT800

CN306 CN606

903374-03 |3 PIN, SIL, .100, RA 903326-04 | 4 PIN, SIL, .100

A2000 SYSTEM SCHEMATICS

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A2000 Board Layout #312723, Rev. 6

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Schematic #312721, Rev. 6 A2000 SYSTEM SCHEMATICS Sheet 1 of 12

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A2000 SYSTEM SCHEMATICS

LEFT AUDIO CN205

FLTLEFT AuDOUT (> RAWLEFT

AUDIN (> RAWRIGHT FLTAIGHT

RIGHT AUDIO

<_CUTOFF

A2000 SYSTEM SCHEMATICS

Schematic #312721, Rev. 6 Sheet 3 of 12 oy

cravuses =T N TERNAL SERIAL

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A2000 SYSTEM SCHEMATICS

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Schematic #312721, Rev. 6 Sheet 5 of 12

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A2000 SYSTEM SCHEMATICS

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Schematic #312721, Rev. 6 A2000 SYSTEM SCHEMATICS

Sheet 6 of 12 _copcrGl> OWNS TS ug Bree EINTIS-# eatittes, 4S t elo | 1) > eee aR Bl = ? eCoRC Soe A901 oa AI12 QAI elle A PORE [ee TE | bil = VAS ES NRE SET SE hee a XROYS ae GAD 1 ne -—— BR(1:231 ll a ES ee: 1 aod EERE (DEERE [aT SORES! Sa Pe Vee ES SF | aac eT 2 aT a ST DRA RARE a a a Lt ee a Sr 7 OE Soe SS Fee a ERS a | ee | a en RN ET NNR SH a ee ee AIPL (0:2) Sas ee ee ee I SSE cee A ae 2 De Se | 0 ee ee Ree peace ee 2 SH pt Fa BS CN6O06 kT CRESS BA | HT TT RE (SSE | i RAN RN RRR ERNE: SEE NH [+ —— "+ at 1 ef 4 hee th t+ — a} — + — + — 9 | TT EE) EE: AR 1 a aT (CE —-—— = i Ce — —_ oe fea CSET) SCOR Ce | 5 Sa) CARROT Lael METAS PETES a Ll { aa meee I : = can Seca I 2 a pias jp —BoAcK i i H{-———hy- $+} —H ratte FT os er eee ee eet i a 0a a | _ll itt AGOS SAGOY fh CI i (anne Ammitl § 80 (0:15) <> l : pl tt ae a cos SAso1 “nee 3———__}} % HH iH a hos ~BuRESS = “_BAS<S Pst E74 >> = SS sd ~ _6BGU > ef es ETNTI<) Teal cine WE8G (1:5!

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A2000 SYSTEM SCHEMATICS

Schematic #312721, Rev. 6 Sheet 7 of 12

IBM 8 BIT EXPANSION BUS IBM 16 BIT EXTENDED BUS

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Schematic #312721, Rev. 6 Sheet 8 of 12

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A2000 SYSTEM SCHEMATICS

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Schematic #312721, Rev. 6 A2000 SYSTEM SCHEMATICS

Sheet 9 of 12 Alb:231 DAD (0:15) a ov ~0EBS 338 339 _OELQ (FLOPPY FUNCTIONS) ALIS RAS (CONTROL FUNCTIONS) | pes aon ———<_OVR LATCH freied {- ———<0VL ——<OxrDY {>_ROMEN on rege (> _CLKRD VPA u AOE Ki (>_corc OTACK 1 =CDAC ; Layout HIE bs mae Sycore gees 2] Li — i _BcACKC>—— j |

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Schematic #312721, Rev. 6 Sheet 10 of 12

PPO(0: 71

A2000 SYSTEM SCHEMATICS

+Sv ov EXTERNAL FLOPPY ¢ n301> apsoo 1 _ DKRO Pobsessspeed = EMI318y 1 ———<LSEL3 PSTROBEC> S_SEL2 KEYBOARD CN350 —FIROC> IRI -KBCLKQ 3204 SKeCLS | £323 0:80:15) eecera Tour e261 e230 “ezese “]+C912 U300 TOCpF “looper rede? T>y70uF => ——>_INOEX 8520 CN303 RH ot aso +SV_USER RU:2310 ae CENTRONICS SH VNR Bes CN301 R3TO> 47 RO A oP2ss i> T woe = an TBASE tieK _ NORMAL} ASCO = £41306 rick pL" 3" ° : cee = nt J300 G_Peser erp ul -VSYNC “|ceeo Sypsttzae L___ | — tate PT = 1 OVLS 1 ninco LEO 0301 2n39c4 Pack oo A303, um PBUST<) 7 q. 7K R300 = PPOUTS oi 4301 PSEL<}-—_____ 8 OF I: BUSRSTQ PHF Og ‘ “jeune +Sv ra 1K BRST oe L_ARRST u atast : 2 4 ced s <_séil o1R-e>—— | = > 2 SStEP —O)_KBRST

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Schematic #312721, Rev. 6 A2000 SYSTEM SCHEMATICS Sheet 11 of 12

Siete ee ee ee RAWLEFT PPO(O: 7) RAHA IGHT Spark SF LTLEFT

PBUSY PPOUT b (0:3) G (0:3) R (0:3)

<P STROBE

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