Commodore PC10-1,PC10-2 a

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SERVICE MANUAL

PC 10-1/10-2

'P'ltlbKtK eVUf,

MARCH, 1987

PN-319914

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commodore

COMPUTERS

SERVICE MANUAL

PC 10-1/10-2

MARCH, 1987

PN-319914

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.

Copyright © 1987 by Commodore Electronics Limited.
All rights reserved.

PC10-1/PC10-2 SERVICE MANUAL

CONTENTS

TITLE PAGE

SPECIFICATIONS PC/10-1 ............................................................................................................. 1

SPECIFICATIONS PC/10-2 ............................................................................................................. 2

BLOCK DIAGRAM .......................................................................................................................... 3

BOARD LAYOUT ............................................................................................................................. 3

MAJOR PARTS LIST ...................................................................................................................... 4

PCB ASSEMBLY #380064

PARTS LIST ........................................................................................................................ 5

BOARD LAYOUT ................................................................................................................. 7

SCHEMATIC (sheet 1 of 8 )................................................................................................. 8

SCHEMATIC (sheet 2 of 8) ................................................................................................. 9

SCHEMATIC (sheet 3 of 8) ................................................................................................. 10

SCHEMATIC (sheet 4 of 8 )................................................................................................. 11

SCHEMATIC (sheet 5 of 8 ) ................................................................................................. 12

SCHEMATIC (sheet 6 of 8 )................................................................................................. 13

SCHEMATIC (sheet 7 of 8 )................................................................................................. 14

SCHEMATIC (sheet 8 of 8) ................................................................................................. 15

RAM EXPANDER

PARTS LIST ........................................................................................................................ 16

BOARD LAYOUT ................................................................................................................. 16

SCHEMATIC ........................................................................................................................ 16

MAJOR VENODRS LIST................................................................................................................. 17

PC10-1/PC10-2 SERVICE MANUAL

SPECIFICATIONS

PC10-1

MEMORY

ROM PHOENIX BIOS (16K)
RAM

512K WITH PARITY

RAM EXPANDABLE

ON BOARD

YES

ON SLOTS

YES

CPU

TYPE

8088
CLOCK SPEED 4.77 MHz
8087 MATH CO-PROCESSOR SOCKET ON BOARD
NUMBER OF SLOTS

5 FULL LENGTH
OPERATING SYSTEM MS-DOS 3.2

KEYBOARD

NUMBER OF KEYS 85

TYPE TYPEWRITER STYLE

NUMERIC KEYPAD

YES

FUNCTION KEYS

10

POWER SUPPLY

OUTPUT RATING 112 WATTS

MAXIMUM CONFIGURATION SUPPORTED TWO FLOPPY DRIVES + 40 MB HARD DRIVE

+ 5 EXPANSION CARDS

INPUT/OUTPUT PORTS

RS-232C SERIAL

BUILT-IN

CENTRONICS PARALLEL

BUILT-IN

STORAGE

FLOPPY DRIVE CONTROLLER

BUILT-IN SUPPORTS FOUR DRIVES

FLOPPY DRIVES

SINGLE HALF-HEIGHT

HARD DRIVE

OPTIONAL BRACKETS FOR HALF OR

FULL HEIGHT

VIDEO

ATI “GRAPHICS SOLUTION” ADAPTER

STANDARD

• MODES

1) MONOCHORME ADAPTER

2) COLOR/GRAPHICS ADAPTER

3) HERCULES MONO GRAPHIC ADAPTER

4) PLANTRONICS COLORPLUS ADAPTER

5) EMULATION OF COLOR/GRAPHICS
ADAPTER ON MONOCHROME MONITOR

• TEXT MODES
40 x 25
80 x 25

132 x 25
132 x 44

• GRAPHICS MODES

320 x 200 (4 OR 16 COLORS)
640 x 200 (2, 4, OR 16 COLORS)
720 x 348 (HERCULES COMPATIBLE)

• COMPATIBLE MONITORS
IBM COMPATIBLE TTL MONOCHROME
RGBI COLOR

COMPOSITE COLOR OR MONOCHROME

AUDIO

POLYPHONIC TONES

YES

1

PC10-1/PC10-2 SERVICE MANUAL

SPECIFICATIONS

PC10-2

MEMORY

ROM
RAM
RAM EXPANDABLE

ON BOARD
ON SLOTS

CPU

TYPE
CLOCK SPEED
8087 MATH CO-PROCESSOR

NUMBER OF SLOTS

OPERATING SYSTEM

KEYBOARD

NUMBER OF KEYS

TYPE

NUMERIC KEYPAD
FUNCTION KEYS

POWER SUPPLY

OUTPUT RATING

MAXIMUM CONFIGURATION SUPPORTED

INPUT/OUTPUT PORTS

RS-232C SERIAL
CENTRONICS PARALLEL

STORAGE

FLOPPY DRIVE CONTROLLER
FLOPPY DRIVES
HARD DRIVE

VIDEO

ATI “GRAPHICS SOLUTION” ADAPTER

• MODES

1) MONOCHORME ADAPTER

2) COLOR/GRAPHICS ADAPTER

3) HERCULES MONO GRAPHIC ADAPTER

4) PLANTRONICS COLORPLUS ADAPTER

5) EMULATION OF COLOR/GRAPHICS
ADAPTER ON MONOCHROME MONITOR

• TEXT MODES
40 x 25
80 x 25

132 x 25
132 x 44

• GRAPHICS MODES

320 x 200 (4 OR 16 COLORS)
640 x 200 (2, 4, OR 16 COLORS)
720 x 348 (HERCULES COMPATIBLE)

• COMPATIBLE MONITORS

IBM COMPATIBLE TTL MONOCHROME
RGBI COLOR
COMPOSITE COLOR OR MONOCHROME

AUDIO

POLYPHONIC TONES

PHOENIX BIOS (16K)

620K WITH PARITY

N/A
N/A

8088

4.77 MHz
SOCKET ON BOARD
5 FULL LENGTH
MS-DOS 3.2

85
TYPEWRITER STYLE
YES

10

112 WATTS

TWO FLOPPY DRIVES + 40 MB HARD DRIVE

+ 5 EXPANSION CARDS

BUILT-IN
BUILT-IN

BUILT-IN SUPPORTS FOUR DRIVES
DUAL HALF-HEIGHT
OPTIONAL BRACKETS FOR HALF OR
FULL HEIGHT

STANDARD

YES

2

PC10-1/PC10-2 SERVICE MANUAL

BOARD LAYOUT

A = 8088 CPU

B = 8087 coprocessor

C = Interrupt controller

D = DMA controller
E = System registers
F = Timer

G = PAL address decoder

H = ROM/EPROM BIOS
I = DIP switch

J = Keyboard interface

K = Floppy controller

L = Parallel interface
M= Serial interface

N = I/O expansion slots
O = Internal keyboard connector
Q = Parallel printer connector

R = Internal serial connector
S = Loudspeaker connector
T = Floppy activity LED connector

U = Power connector
V = J14 Serial, Parallel, and Floppy

configuration jumpers

Register

CS

FLOPPY INTERFACE

DRIVES 1-4

DATA INPUT

DRIVE CONTROL

DATA OUTPUT

FREQUENCY ADJUST

BLOCK DIAGRAM

3

PC10-1/PC10-2 SERVICE MANUAL

MAJOR PARTS LIST PC10-1/PC10-2

PC10-1 (SINGLE DRIVE, 512K)
PC 10-2 (DUAL DRIVE, 640K)

312200-01
312200-03

MAIN ASSEMBLY

380073-01

TOP HOUSING

380101-01

BOTTOM HOUSING

380100-02
FRONT PANEL 380102-01
POWER CORD

903508-04
KEYBOARD ASSEMBLY 380008-02

PCB ASSEMBLY COMBINED MAIN BOARD 380064-01
PCB ASSEMBLY RAM EXP 384K 380065-01
PCB ASSEMBLY RAM EXP 256K

380065-02
PCB ASSEMBLY ATI (MONO/COLOR VIDEO)
FLOPPY DISK DRIVE

380069-01

380111-01
SPEAKER ASSEMBLY 8256099-03

POWER SUPPLY ASSEMBLY

380021-02

POWER SUPPLY ASSEMBLY SUB: 390138-01

POWER ON LED ASSEMBLY 380016-01
CABLE ASSEMBLY - KEYBOARD CONNECTOR 380017-01
CABLE ASSEMBLY - RS232

312208-01

CABLE ASSEMBLY - DRIVE

380012-02

DOS MANUAL

319905-01

BASIC MANUAL

319906-01

4

PC10-1/PC10-2 SERVICE MANUAL

PARTS LIST

PCB ASSY. #380064

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 #314000-01.

INTEGRATED CIRCUITS

U1,4,5

11,69,72 74LS74 D Type Flip F
U2,45,73 74LS04 Inverter
U3 7407 Buffer
U6 74LS08 AND
U7
U8 74LS273 8 Bit D-FF
U9,17
51,76
U10 74LS299 Shift Reg
U12 74LS670 Register File
U13,52,
55 74LS373 D Latch
U14 8237A-5 DMA Cntrl

U15

U16

U18,21,
42,56,43 74LS245 Buffer

U19

U20

U22-U30
U31 74LS11 AND

U32,33 74HCT158 MUX

U34 74S280 Parity Gen

U35

U36 Delay Line 50ns

U37

U38 16L8 PAL

U39 7700 PLA Decode2

U40 7700 PLA Decode 1

U41

U44

U46,58,

61

U47 74S74 D Type FlipFlop 901525-09

U48 8288 Bus Cntrl 901876-01

U49

U50 8088 CPU 5MHz 380200-01

U53 8284A Clk Gen

U54

U57 74LS163 Counter

U59 74LS629 VCO 901521-84

U60

U62

U63 74LS174 6 Bit D-FF

U64 jiPD765AC-2 FDC

U65

U 66-68 7438 NAND/OC

_

901521-06
901521-02
901522-30
901521-03

74LS155

—

74LS244 8 Bit Buffer

—

8259A Intrpt Cntr
8253A-5 Timer 380202-01

—

74LS367 6 Bit Buffer
74LS257 MUX
Dram 256Kx1 150ns

Sub: 74S158 MUX

74HCT32 OR 380227-01

74S00 NAND

Sub: FPLA 82S100

Sub: FPLA 82S100

BIOS EPROM 27128

74LS02 NOR

—

74LS175 4 Bit D-FF 901521-34

8087 Co-Processor

74ALS11 AND

1691 Data Separator

74LS123 Monoflop 901521-49

74LS14 Schmitt-Trig

901521-79
901521-42

901521-13
901521-72
901521-82

901521-29
380203-01
901874-01

901521-46
901521-47
901521-57
380223-01
901521-80
380227-04
901525-31
901525-29

324667-01
901525-04
380257-01
380212-08
380212-08
380212-07
380212-07
380258-03
901521-21

380201-01

901875-01
380230-02
901521-33

380207-01

901521-63

380206-01
901521-30
901522-09

INTEGRATED CIRCUITS (continued)

U70 74LS125 Buffer
U71
U74
U75 74LS365 6 Bit Buffer 901521-48
U77 74LS374 D Type FF
U78
U79

8250 ACI
74175 4 Bit D-FF

MC1489 Line Recvr
MC1488 Line Driver 901524-06

901521-20
380205-01
901522-43

901521-43
901524-07

DIODES

D2, D3
D1 1N 4148 50mA/50V

1 N 4001 1A/50V 900750-01

900850-01

RESISTORS — All values are in ohms-1/4 W

5% unless noted otherwise.

R1-4,16,
18,29,30
R24 68 ohm
R13
R31
R32 820 ohm
R17
R8-12,19,
20,23,27 2K2 ohm
R5,21

33 ohm

220 ohm
510 ohm

1K2 ohm

4K7 ohm

R28
R22
R25
R26
R14,15
R33

8K2 ohm

10K ohm
47K ohm
82K ohm

1M ohm
Trimmer

0.1W 2K2
(Valvo,

ECP 10
Type “ S” )

CAPACITORS

C84-C95 Ceramic 2200 pF, 50V
C96
C97
C102
C81-83,

161-169
C101
C107-114,

126-145
C1-6,11-13,

17-21,31,35,
37,42-44,46,
47,51,52,54,

58,61,66-70,

73,77,78

C14-16,22-

30,32,33,34,

36,38-41,

48-50,53,56,

59,60,64,71,

80,99,100,

115-125,146-

148,158-160,

170,171 Ceramic

Ceramic
Ceramic 47 pF, 50V
Ceramic

Ceramic 100 pF,
Ceramic 150 pF,

Ceramic

Ceramic 0.1 fxF, 50V

22 pF,

82 pF, 50V

1000 pF, 25 V

0.22 /xF,

50V

100 V

50V

50V

5

PARTS LIST (continued)

PC10-1/PC10-2 SERVICE MANUAL

CAPACITORS (Continued)

C98
C149-157,

173
C172 Electro. Axial
TR Var 2-40 pF

Polyester 0.68

Electro. Rad

fiF, 63V

47/xF, 25V
47/xF, 16V

MISCELLANEOUS

Q2
Q3
Q1

VR1

L1

SW1

1.8432 Crystal

8.0000 Crystal

14.31818 Crystal

7905 Volt Reg -5V

Coil 100 /xH 3 ohm 380329-01

Dip Switch

900555-02
900556-01
900558-01

901527-03

903349-01

CONNECTORS

J2

J8-J12

J7

CNNT 25P Mini Din
(Female, Amp 167131-1)
CNNT 2x31 P Edge
(Tl or TRW Equiv.
.100 Center)
CNNT 6P Female
(Amp 350 827-01)

TRANSISTORS

T1, T2 NPN BC 337-16

380307-02

903446-02

903349-01

324220-01

6

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PC10-1/PC10-2 SERVICE MANUAL

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PC10-1/PC10-2 SERVICE MANUAL

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15

RAM EXPANSION CONNECTOR

PC10-1/PC10-2 SERVICE MANUAL

PARTS LIST

RAM EXPANDER

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 #314000-01.

INTEGRATED CIRCUITS

U1-9
U12-15
U10,11

CAPACITORS

C16
C1-15

4256 256Kx1 Dram 380223-01
4464 64Kx4 Dram 380256-01
4164 64Kx1 Dram 904150-02

Electrol Axial 47/tF 16V
Ceramic 0.22/tF 50V

RESISTORS

R1
RA1

CONNECTORS

J1

33 ohm 1/4W
4x33 ohm SIP

CNNT 34P Female 380311-01
(Amp 1-166 592-7)

BOARD LAYOUT

Pin

3I

C9 C10 C11

d d ( H D d d

j i

1

2

C12 C13 C14 C15

d d d d a d d

U12

|

J

j .

T

_

C16

T

+

33

34

U13

RA1

U14

1985 COMMODORE PC

RAM EXTENSION

U15

16

PC10-1/PC10-2 SERVICE MANUAL

APPROVED VENDORS LIST

PCB ASSY. COMBINED MAIN BOARD

PART NUMBER

DESCRIPTION

VENDOR NAME

VENDOR PART NO.

380200-01

IC LSI MPU 8088 5MHZ

AMD

AM8088

INTEL

8088

NEC

4PD8088

SIEMENS

SAB8088

380202-01

IC LSI PRGM INTVAL TIMER 8253 AMD

P8253-5

INTEL

P8253-5
NEC VPD8253C-2
NEC VPD8253C-5

380203-01

IC LSI DMA-CNTRL D8237AC-5 NEC D 8237 AC-5

380205-01 IC LSI ACI 8250 NSC INS8250AN

WESTERN DIGI WD8250PL

380206-01

IC LSI FDC UPD765

NEC

VPD 765AC-2

380223-01

IC MEM DRAM 256KX1BIT 150NS

FUJITSU

MB81256-15
HITACHI HM50256P-15
MATSUSHITA MN41256-15
NEC

D41256C-15
OKI MSM41256-15
SAMSUNG

KM41256-15
SHARP

LH21256-15
Tl

TMS4256-15NL

TOSHIBA TMM41256P-15

324667-01

IC DIGITAL DELAY LINE BEL 0447-0250-02

DATATRONIC DL6310

NYTRONICS

DDL-250F

PCA ELECT

EP8205
PULSE ENG

21214

380207-01 IC LSI DATA SEPARATOR 1691 WESTERN DIGI WD1691
901524-06

IC LIN LINE DRIVER MC1488

FAIRCHILD UA1488PC
MOTOROLA MC1488
SIGNETICS MC1488

901524-07

IC LIN LINE DRIVER MC1489

MOTOROLA MC1489
NSC MC1489

SIGNETICS

MC1489

PCB ASSY. RAM EXPANSION CARD

PART NUMBER

DESCRIPTION VENDOR NAME

VENDOR PART NO.

380223-01 IC MEM DRAM 256KX1BIT 150NS

FUJITSU

MBB1256-15

HITACHI

HM50256P-15
MATSUSHITA MN41256-15
NEC

D41256C-15

OKI

MSM41256-15

SAMSUNG

KM41256-15

SHARP LH21256-15
Tl

TMS4256-15NL

TOSHIBA TMM41256P-15

380256-01 IC MEM DRAM 64KX4BIT Tl TMS 4464 JL-15

Tl

TMS 4464 NL-15

901505-02

IC MEM DRAM 64KX1BIT 150NS FUJITSU

MB8264-15P-G
HITACHI

HM4864-2
MICRON

MT4264-2
NEC

UPD4164C-15

OKI

MSM3764-15RS
SHARP

LH2164-15

TOSHIBA

TMM4164P-3

17

COMPUTERS

Computer Systems Division

1200 Wilson Drive

West Chester, PA 19380

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