Page 1
SERVICE MANUAL
P C 1 0 - 1 / 1 0 - 2 /1 0 - lll
APRIL, 1989 PN-314860-01
C= Commodore
Page 2
SERVICE MANUAL
P C 1 0 - 1 / 1 0 - 2 /1 0 - lll
APRIL, 1989 PN-314860-01
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 © 1989 by Commodore Electronics Limited.
All rights reserved.
Page 3
PC10-1/10-2/10-lll 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 VENDORS LIST....................................................................................................................... 17
PC10-1, PC 10-2
MEMORY MAP .......................................................................................................................... 18
SWITCH SETTING (MAIN PCB) ............................................................................................... 19
ATI CARD SWITCH SETTING ................................................................................................. 20
FLOPPY DRIVE (CHINON F502) TERMINATORS
................................................................
21
HD MOUNTING KIT................................................................................................................... 22
BIOS SELF TEST ERROR MESSAGE ................................................................................... 23
TROUBLESHOOTING NOTES ................................................................................................. 25
Page 4
PC10-1/10-2/10-lll SERVICE MANUAL
CONTENTS (continued)
TITLE PAGE
PC10-III
TECHNICAL SPECIFICATIONS .............................................................................................. 26
DIP SWITCH SETTINGS ........................................................................................................... 27
JUMPER SETTINGS ................................................................................................................. 28
CONNECTOR PIN OUTS ........................................................................................................ 29
MAJOR PARTS LIST ................................................................................................................ 30
COMPONENT PARTS LIST ..................................................................................................... 31
PCB LAYOUT ............................................................................................................................ 33
SCHEMATICS ............................................................................................................................ 34
MEMORY MAP .......................................................................................................................... 40
MONITOR PROGRAM .............................................................................................................. 41
4.36 BIOS NOTES .................................................................................................................... 42
KEYBOARD SCHEMATIC ........................................................................................................ 43
POWER SUPPLY SCHEMATIC .............................................................................................. 44
POWER SUPPLY PCB LAYOUT ............................................................................................ 45
POWER SUPPLY PARTS LIST............................................................................................... 46
Page 5
PC10-1/10-2/10-lll SERVICE MANUAL
SPECIFICATIONS
PC10-1
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)
512K WITH PARITY
YES
YES
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
SINGLE HALF-HEIGHT
OPTIONAL BRACKETS FOR HALF OR
FULL HEIGHT
STANDARD
YES
1
Page 6
PC10-1/10-2/10-M 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
Page 7
PC10-1/10-2/10-lll 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
CONTROL BUS
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
FLOPPY INTERFACE
DRIVES 1-4
DATA INPUT
DRIVE CONTROL
DATA OUTPUT
FREQUENCY ADJUST
Register
CS
BLOCK DIAGRAM
3
Page 8
PC10-1/10-2/10-lll 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
Page 9
PC10-1/10-2/10-III 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
901521-06
U2,45,73
74LS04 Inverter
901521-02
U3 7407 Buffer
901522-30
U6 74LS08 AND
901521-03
U7
74LS155
901521-79
U8
74LS273 8 Bit D-FF
901521-42
1)9,17
—
51,76
74LS244 8 Bit Buffer
901521-13
U10
74LS299 Shift Reg
901521-72
U12
74LS670 Register File
901521-82
1)13,52,
—
55
74LS373 D Latch
901521-29
U14
8237A-5 DMA Cntrl 380203-01
U15 8259A Intrpt Cntr
901874-01
U16 8253A-5 Timer 380202-01
U18,21,
—
42,56,43 74LS245 Buffer 901521-46
U19 74LS367 6 Bit Buffer
901521-47
U20
74LS257 MUX
901521-57
U22-U30 Dram 256Kx1 150ns 380223-01
U31
74LS11 AND 901521-80
1)32,33 74HCT158 MUX
380227-04
Sub: 74S158 MUX 901525-31
U34
74S280 Parity Gen
901525-29
U35
74HCT32 OR 380227-01
U36 Delay Line 50ns
324667-01
U37
74S00 NAND
901525-04
U38
16L8 PAL 380257-01
U39
7700 PLA Decode2
380212-08
Sub: FPLA 82S100 380212-08
U40 7700 PLA Decodel
380212-07
Sub: FPLA 82S100 380212-07
U41
BIOS EPROM 27128 380258-03
U44
74LS02 NOR
901521-21
1)46,58,
—
61 74LS175 4 Bit D-FF
901521-34
U47
74S74 D Type FlipFlop 901525-09
U48 8288 Bus Cntrl 901876-01
U49 8087 Co-Processor 380201-01
U50 8088 CPU 5MHz 380200-01
U53
8284A Clk Gen
901875-01
U54 74ALS11 AND
380230-02
U57
74LS163 Counter
901521-33
U59
74LS629 VCO
901521-84
U60
1691 Data Separator
380207-01
U62 74LS123 Monoflop
901521-49
U63
74LS174 6 Bit D-FF
901521-63
U64
MPD765AC-2 FDC
380206-01
U65
74LS14 Schmitt-Trig
901521-30
U 66-68 7438 NAND/OC
901522-09
INTEGRATED CIRCUITS (continued)
U70
74LS125 Buffer 901521-20
U71
8250 AC I
380205-01
U74
74175 4 Bit D-FF 901522-43
U75
74LS365 6 Bit Buffer 901521-48
U 77 74LS374 D Type FF
901521-43
U78 MC1489 Line Recvr
901524-07
U79
MC1488 Line Driver
901524-06
DIODES
D2, D3 1 N 4001 1A/50V 900750-01
D1
1N 4148 50mA/50V
900850-01
RESISTORS — All values are in ohms-1/4 W
5% unless noted otherwise.
R1-4,16,
R28
8K2 ohm
18,29,30 33 ohm
R22 10K ohm
R24
68 ohm
R25
47K ohm
R13 220 ohm
R26
82K ohm
R31 510 ohm
R14,15
1M ohm
R32
820 ohm
R33
Trimmer
R17 1K2 ohm
0.1W 2K2
R8-12,19,
(Valvo,
20,23,27 2K2 ohm
ECP 10
R5,21 4K7 ohm
Type “S”)
CAPACITORS
C84-C95
Ceramic 2200 pF,
50V
C96 Ceramic 22 pF,
50V
C97
Ceramic
47 pF, 50V
C102
C81-83,
Ceramic
82 pF, 50V
161-169 Ceramic 100 pF,
100 V
C101
C107-114,
Ceramic
150 pF,
50V
126-145
C1-6,11-13,
17-21,31,35,
37,42-44,46,
47,51,52,54,
58,61,66-70,
Ceramic
1000 pF,
25V
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,
Ceramic
0.1 mF, 50V
170,171
Ceramic 0.22 /(F, :50V
5
Page 10
PC10-1/10-2/10-lll SERVICE MANUAL
PARTS LIST (continued)
CAPACITORS (Continued)
C98
C149-157,
Polyester 0.68 /*F, 63V
173 Electro. Rad
47/*F, 25V
C172 Electro. Axial
47mF, 16V
TR
Var
2-40 pF
MISCELLANEOUS
Q2
1.8432 Crystal
900555-02
Q3
8.0000 Crystal
900556-01
Q1
14.31818 Crystal 900558-01
VR1
7905 Volt Reg -5V 901527-03
L1
Coil 100 /^H 3 ohm 380329-01
SW1 Dip Switch 903349-01
CONNECTORS
J2 CNNT 25P Mini Din
(Female, Amp 167131-1)
380307-02
J8-J12
CNNT 2x31 P Edge
(Tl or TRW Equiv.
.100 Center)
903446-02
J7
CNNT 6P Female
(Amp 350 827-01)
903349-01
TRANSISTORS
T1, T2 NPN BC 337-16
324220-01
6
Page 11
PC10-1/10-2/10-M SERVICE MANUAL
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8
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PC10-1/10-2/10-lll SERVICE MANUAL
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PCB ASSY. #380504 (sheet 2 of 8)
9
Page 14
PC10-1/10-2/10-lll SERVICE MANUAL
10
Page 15
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PC10-1/10-2/10-lll SERVICE MANUAL
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PCB ASSY. #380504 (sheet 4 of 8)
11
Page 16
PC10-1/10-2/10-lll SERVICE MANUAL
12
Page 17
PC10-1/10-2/10-lll SERVICE MANUAL
13
Page 18
14
Page 19
U\f
PC10-1/10-2/10-lll SERVICE MANUAL
Page 20
ft A M EXPANSION CONNECTOR
PC10-1/10-2/10-lll 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 RESISTORS
U1-9
U12-15
U10.11
CAPACITORS
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/xF 50V
R1
RA1
CONNECTORS
J1
33 ohm 1/4W
4x33 ohm SIP
CNNT 34P Female 380311-01
(Amp 1-166 592-7)C16
BOARD LAYOUT
3P Pin
C9 C10 C11
CZD CZD CZD
j i
1
2
C12 C13 C14 C15
CZD CZD CZD (ZD
U12
I
1
_
C16
U13
r
+
33
34
RA1
U14 U15
1985 COMMODORE PC
RAM EXTENSION
16
Page 21
PC10-1/10-2/10-lll 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
Page 22
PC10-1/10-2/10-111 SERVICE MANUAL
PC10-1, PC10-2 MEMORY MAP
Usage
Address
Size
00000-003FF 1K
Interrupt vectors
00400-004FF
256 BIOS/DOS data area
00500-3FFFF
255K
DOS/User RAM
40000-7FFFF 256K
User RAM
80000-9FFFF 128K User RAM
A0000-AFFFF 64K
Reserved
B0000-B0FFF 4K
Monochrome video RAM
B1000-B3FFF
12K
Additional monochrome video RAM
B4000-B7FFF 16K
Reserved
B8000-BFFFF 32K
Color video RAM
C0000-C7FFF
32K
Reserved (diagnostics or video ROM)
C8000-C9FFF
8K
Hard disk BIOS (on controller card)
CA000-FBFFF
200K Reserved
FC000-FFFFF
16K
BIOS ROM (version 1D is only 8K)
00000
3FFFF
40000
9FFFF
A0000
AFFFF
B0000
B3FFF
B4000
B7FFF
B8000
BFFFF
C0000
C7FFF
C8000
C9FFF
CA000
FBFFF
FCOOO
FFFFF
256 K standard memory
Memory expansion
Reserved
Monochrome video
Reserved
Color video
Diagnostics or Video
Hard disk BIOS
Reserved
BIOS
18
Page 23
PC10-1/10-2/10-lll SERVICE MANUAL
PC10-1, 10-2 MAIN PCB SWITCH SETTINGS
System DIP Switches (Located on Main PCB)
Switch No.
Function
1
OFF: Boot
ON: System diagnostic
2
OFF: 8087 installed
ON: 8087 not installed
3,4 System RAM configuration
5,6
Default video mode
7,8
Number of floppy drives installed
System RAM Installed
Switch No.
3,4 Ram Size
ON, ON 128 KB
OFF, ON
256 KB
ON, OFF 512 KB
OFF, OFF 640 KB
Default Video Mode
Switch No.
5,6
Function
ON, ON
OFF, ON
ON, OFF
OFF, OFF
Monochrome 40 x 25
Color 40 x 25 (B&W mode)
Color 80 x 25 (B&W mode)
Monochrome 80 x 25
Number of Floppy Drives Installed
Switch No.
7,8
Number of installed drives
ON, ON
1
OFF, ON
2
ON, OFF
3
OFF, OFF
4
19
Page 24
PCI0-1/10-2/1O-lll SERVICE MANUAL
PC10-1, 10-2 ATI VIDEO CARD SWITCH SETTINGS
Note: Numerals on figure
indicate switch
numbers.
Default Display Mode 2 1
Mono
OFF ON
Color
ON OFF
Emulation OFF
OFF
Monitor Type 4 3
Composite
ON
OFF
Monochrome or RGB OFF ON
IBM Enhanced
OFF OFF
Composite Monitor 5
Color ON
Monochrome
OFF
ALWAYS OFF
ALWAYS ON
a
o
■'H
ATI Graphics Solution Switch Settings
Default Video Mode
DIP — Switch
SW5
SW6
Emulation Mode
ON
OFF
Color/Graphics
ON OFF
Monochrome
OFF OFF
Commodore PC Switch Settings on Motherboard.
20
Page 25
PC10-1/10-2/10-lll SERVICE MANUAL
J1 — 1 Terminator (Last device on cable)
PC10-1, 10-2 Drive — Chinon F502 Type
21
Page 26
PC10-1/10-2/10-lll SERVICE MANUAL
PC10-1, 10-2 Hard Drive Mounting Instructions
For HD Mounting Kit #380042-01
A) Assemble hard disk bracket according to installation diagram enclosed with this section.
B) Remove top cover of PC10 (5 screws on rear and 2 screws on sides).
C) Remove Ram expansion card from main board.
D) Mount hard drive onto brackets with 4 screws.
E) Slide hard drive and bracket into housing space provided next to the floppy drive and fasten to the
chassis with two screws.
F) Connect all necessary cables (These are supplied with third party hardware).
G) Reinstall Ram expansion card.
H) Test unit. Software installation and initialization procedures are included with third party hard disk units.
I) Reassemble top housing.
PLEASE NOTE: Commodore Service will not issue any credits for installation labor of third party hardware.
Mounting Assembly PC10-1, 10-2 Hard Drive (Revision A) Kit #380042-01
ITEM
PART NUMBER
DESCRIPTION
1
380124-01 SUB CHASSIS HARD DISK
2
380125-01 PLATE HOLDING HARD DISK
3
312219-01 SHOCK ABSORBER RUBBER
4
906800-03
SCREW PHL PAN HD M3
5
907272-06 WASHER FLAT M4.3
6
905635-04 WASHER LOCK EXT TOOTH M4
22
Page 27
PC10-1/10-2/10-lll SERVICE MANUAL
PC10-1, 10-2 BIOS SELF TEST DIAGNOSTICS
The Commodore PC carries out a number of self checks when it is switched on. When all the tests
are completed satisfactorily the PC will boot the MS-DOS operating system. Failure of a test that
is essential to the operation of the PC results in the output of an error code and a system halt. Fail
ure of non essential functions result in the output of an error code but the system continues with
the test.
All errors below 62 (hex) are fatal system errors and cause a system halt. Errors above 61 (hex)
are treated as warnings so power up continues. DIP switch 1 on the system board is used to loop
the diagnostic tests (see error code FF).
The various diagnostic tests are as follows:
ERROR TEST
CODE CAUSE OF ERROR
00 CPU/SYSTEM BUS
This error occurs if the CPU is faulty, or the system bus is bad (data, addr. etc.), or the
ROM is faulty.
Action: system HALT.
10 TIMER 0,1
Occurs if Timer outputs 0 or 1 are too slow or too fast.
Action: system HALT.
20 SYSTEM PORT, TIMER 2
System port (61H) does not store control bits or timer 2 cannot be controlled (GATE 2,
OUTPUT 2).
Action: system HALT.
30 ROM CHECKSUM BAD
The BIOS ROM does not checksum to 00. The ROM itself is faulty, or the address
logic, or the data bus is bad.
Action: system HALT.
40 DMA CONTROLLER R/W ERROR
Registers of the DMA controller do not store parameters.
Action: system HALT.
50 PROGRAMMABLE INTERRUPT CONTROLLER
Interrupt controller does not respond to timer interrupt.
Action: system HALT.
60 ADDRESS FAILURE
All locations up to 640 K (if present) are filled with address dependent contents and
then afterwards read back and checked. Faults in address decoding will cause a write
to one location to destroy other locations.
Action: system HALT.
61 BASE RAM
A R/W storage failure in the lower 16 K RAM.
Action: system HALT.
23
Page 28
PC10-1/10-2/10-lll SERVICE MANUAL
PC10-1, 10-2 BIOS SELF TEST DIAGNOSTICS (continued)
ERROR TEST
CODE CAUSE OF ERROR
62 MAIN RAM
R/W storage failure in the RAM size specified by DIP switches 3 and 4. Either the RAM
is bad or the DIP switches reflect the wrong RAM size.
Action: Print RAM segment in error followed by the bit pattern (e.g. AA or 55) or 00 (for
parity error) followed by the words RAM. Memory size is adjusted downwards.
80 VIDEO RAM
R/W storage failure in the video RAM section. As set by DIP switches.
Action: Issue one long and two short beeps.
81 VIDEO RETRACE
No video signal found or retrace pulses missing.
Action: Issue one long and two short beeps.
AO KEYBOARD
No keyboard present, or key struck, or bad keyboard.
Action: Print scan code of stuck key (if any) followed by the word KEY.
C1 ROM SEARCH 1
An extension ROM at C0000 to C7FFF (hex) is found with a bad checksum.
Action: Issue two short and one long beep. Print segment of ROM on screen followed
by the word ROM.
C2 ROM SEARCH 2 - HD BIOS
An extension ROM at C8000 to EFFFF (hex) is found with a bad checksum. Indicates
ROM on HD controller failure.
Action: Issue two short and one long beep. Print segment of ROM on screen followed
by the word ROM.
1701 HARD DISK CONTROLLER
The hard disk controller contains BIOS code for operating the hard disk. If the ROM
checksum is OK it is called at powerup for checking the hard disk and controller. An
error is indicated by printing 1701 on the screen.
DO FLOPPY DISK CONTROLLER
Bad status response after controller initialization.
Action: Print the word FDC on the screen.
E1 PRINTER
Printer port data lines do not read back same contents.
Action: Print the word PRN on screen.
E2 SERIAL INTERFACE - ACIA
Fault with serial interface.
Action: Print the word ACIA on screen.
FF SYSTEM OK, END OF DIAGNOSTICS.
Actions: Attempts to bootstrap if DIP switch 1 is OFF. If this switch is ON the system
performs a cold start and loops the diagnostics until an error is found. Even if an error
is above 61 (hex) the system halts.
Note: This message will not be printed on the screen.
24
Page 29
PC10-1/10-2/10-lll SERVICE MANUAL
PC10-1, 10-2 TROUBLESHOOTING NOTES
REPAIR TIP: PC PARITY ERRORS
THE PC USES A NINTH BIT TO DETERMINE PARITY. IF A BYTE CONTAINS AN EVEN NUMBER
OF “ 1” BITS, THEN A “ 1” WILL BE GENERATED IN THE PARITY BIT. IF THE BYTE CONTAINS
AN ODD NUMBER OF “ 1” BITS, THEN A “ 0” WILL BE GENERATED IN THE PARITY BIT. THE
SYSTEM MAINTAINS THIS “ ODD PARITY” TO INSURE THAT DATA HAS NOT BEEN CORRUPTED
DURING DATA TRANSFERS.
REFER TO YOUR PC SERVICE MANUAL PN #319914. PAGES 10 AND 11 TO LOCATE THE IC‘S
LISTED.
A) CHECK U30 — THIS IS WHERE THE PARITY OR NINTH BIT IS STORED
B) CHECK U9 — RAM EXPANSION BOARD, UP TO 512K. CHECK U10 & U11 FOR 512 TO 640K.
C) CHECK U1 — PINS 5 & 6 FOR PCK AND PCK ALSO CHECK PIN 1, CLR.
D) CHECK SIGNAL FROM U8 PIN 12 TO U2 PIN 11, OUT PIN 10, ENRAMPCK
E) CHECK U9 — PINS 5 AND 15 (BUFFER) MAY GIVE FALSE VALUE BACK ON DB3. IF THIS CHIP
IS BAD A MESSAGE OF “ UNEXPECTED SWITCH INTERRUPT” WILL OCCUR AND
MAY ALTER SIGNALS SENT FROM U20 (SWITCH SETTINGS).
COMPUTE EFFECTIVE ADDRESS
UNDER CERTAIN ERROR CONDITIONS AN ADDRESS WILL BE DISPLAYED ON THE SCREEN IN
DICATING WHERE IN MEMORY A PROBLEM HAS OCCURRED.
THE ADDRESS IS EXPRESSED IN THE FORM OF REGISTER CONTENTS.
EXAMPLE: CS:IP = 83AB:1010
CS, THE SEGMENT REGISTER CONTAINS HEX 83AB
IP, THE INSTRUCTION POINTER CONTAINS HEX 1010
TO COMPUTE THE EFFECTIVE ADDRESS, SHIFT THE CONTENTS OF THE SEGMENT REGISTER
4 BITS LEFT. THEN ADD.
EXAMPLE: SHIFT LEFT 4 BITS CS = 83AB0
ADD IP = 1010
RESULT EFFECTIVE 20 BIT ADDRESS 84AC0
NOTE: BYTE HOLDS TWO HEX DIGITS.
25
Page 30
PC10-1/10-2/10-lll SERVICE MANUAL
TECHNICAL SPECIFICATIONS
PC10-III
SPECIFICATION
PC10/PC20
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
CURSOR KEYS
POWER SUPPLY
TYPE
MAXIMUM CONFIGURATION SUPPORTED
INPUT/OUTPUT PORTS
RS-232C SERIAL
CENTRONICS PARALLEL
MOUSE PORT
STORAGE
FLOPPY DRIVE
HARD DRIVE
MAXIMUM INTERNAL CONFIGURATION
VIDEO
CGA
80 COLUMN COLOR ALPHA/NUMERIC
40 COLUMN COLOR ALPHA/NUMERIC
640 x 200 BLACK AND WHITE GRAPHICS
320 X 200 4 COLOR GRAPHICS
MDA
80 COLUMN MONOCHROME ALPHA/NUMERIC
HERCULES
720 x 348 MONOCHROME GRAPHICS
PLANTRONICS COLOR PLUS
640 x 200 4 COLOR
320 x 200 16 COLOR GRAPHICS
COMPATIBLE MONITORS
TTL MONOCHROME
RGBI
COMPOSITE NTSC COLOR
COMPOSITE NTSC/PAL MONOCHROME
XT COMPATIBLE
AUTOCONFIG BIOS
640KB
N/A
YES
8088-1
4.77, 7.16, 9.54 MHz
SOCKET ON BOARD
THREE FULL SIZE (XT)
MS-DOS 3.2 INCLUDED
ASCII 101
INTERNATIONAL 102
ENHANCED AT
YES
4 - INVERTED T LAYOUT
HIGH-EFFICIENCY SWITCHING POWER SUPPLY
WITH INTEGRATED COOLING FAN
2 FLOPPY DISK DRIVES, ONE HARD DISK
DRIVE, 3 EXPANSION CARDS
BUILT IN
BUILT IN
BUILT IN FOR 1352 MOUSE
BUILT-IN CONTROLLER SUPPORTS TWO
DRIVES
BIOS BUILT IN FOR “ XT” HARD DISK
INTERFACE
TWO HALF-HEIGHT 5.25 INCH FLOPPY DISK
DRIVES AND ONE HALF-HEIGHT 3.5 INCH HARD
DISK DRIVE
BUILT IN
BUILT IN
BUILT IN
BUILT IN
26
Page 31
PC10-1/10-2/10-lll SERVICE MANUAL
DIP SWITCH SETTINGS AND THE RESET SWITCH
DIP SWITCH SETTINGS
These switch settings refer to the CONFIG switch area on the back of the system unit.
SWITCH #1
UP(OFF) USA/Europe Character Set
DOWN(ON) Scandinavian Character Set
SWITCH #2
UP(OFF) Onboard Video Adapter is MONO
DOWN(ON) Onboard Video Adapter is COLOR
SWITCH #3
SWITCH #4 DEFAULT
VIDEO MODE
SAMPLE
SETTING
UP(OFF)
UP(OFF)
Monochrome
-U
mm
1 2 3 4
UP(OFF) DOWN(ON) 80 Column Color
Z l l i e s
\
8 3 4
DOWN(ON) UP(OFF) 40 Column Color
OFT P
» Q
M M
:
18 3 4
DOWN(ON) DOWN(ON)
NO MONITOR
r s M M
i
£3 4
THE RESET SWITCH
The Reset switch protrudes slightly on the right side of the machine just behind the keyboard connector.
Pressing this switch will effectively re-boot the computer as if the power had been cycled OFF and then
ON. All information in the computer’s RAM memory, as well as information being written to mass storage
devices such as hard disks or floppy disks while the switch was depressed may also be lost.
The intent of the switch is to provide an alternative to cycling power when an application program may
have “ crashed” the computer.
27
Page 32
PC10-1/10-2/10-lll SERVICE MANUAL
JUMPER SETTINGS ON MOTHERBOARD
28
Page 33
CONNECTOR - PIN OUTS
MO USE PORT
PC10-1/10-2/10-III SERVICE MANUAL
SERIAL PORT
Pin No. Signal
1 Vertical
2 Horizontal
3 Vertical Q
4 Horizontal Q
5 Button (3 )
6 Button (1 )
7 -I- 5 volts
8 Ground
9 Button ( 2 )
Video Connector
DB9 Female Connector
Color/Graphic Modes
Pin No.
1
2
3
4
5
6
7
8
9
INTENSITY
VIDEO PORT
Signal
GND
GND
RED
GREEN
BLUE
MONO
H SYNC
V SYNC
Pin No. Signal
Monochrome Mode
1
2
3
4
5
6
7
8
9
GND
GND
not used
not used
not used
INTENSITY
VIDEO
H SYNC
V SYNC
Computer Peripheral
Side Side
- 1
--------
CHASSIS GND----------
--------
- 2
- 3
- 4
- 5
- 6
- 7
- 8
TxD ---------------------
--------
RxD ---------------------
--------
RTS
--------
--------
--------
--------
-----------------------
CTS
-----------------------
DSR ---------------------
SIG GND
DCD ---------------------
- 9 -------- + 12 V -----------------
----------
-1 0
- 20
--------
- 22
--------Rl--------------------------
12 V
------------------
DTR
-----------------------
PA R ALLEL PORT
Computer
Side
- STROBE
-------
-DO
- D1
-------
-D2
------
-D3
------
-D4
------
-D5
------
-D6
------
-D7
-------
9 —
<
-------10-----
-------11-----
<
<
-------12-----
4
-------
13
-------14-----
<
-------15-----
-------16-----
-------17-----
-------
18-25
------
- ACK
-------
BUSY —
-PE
-------
- SLOT
---------
- AUTO FDXT
- ERROR
- INIT
-SLCT IN
GND
------
------------
------
---------
---------------
Printer
Side
29
Page 34
PC10-1/10-2/10-lll SERVICE MANUAL
MAJOR PARTS LIST PC10-III
POWER CORD
903508-15
KEYBOARD ASSEMBLY
312702-02
MANUAL USER/DOS 3.2 (ENGLISH) 319953-01
MANUAL OPERATIONS 319964-02
MANUAL BASIC 3.2 (ENGLISH)
319906-01
DISK OPERATING SYSTEM DOS 3.2
380538-01
DISK UTILITIES DOS 3.2 380538-02
MOUNTING BRACKET 312233-01
BEZEL
313010-01
BEZEL F.D. HOLE COVER 312679-01
EXTENSION CARD PANEL 380120-01
PCB GUIDE 251118-01
FLOPPY DISK DRIVE 380111-01
POWER SUPPLY (UL/CSA) 312637-02
FOOT
380128-01
NAMEPLATE
380132-10
STANDOFF
312689-02
PLATE LOGO
380133-05
FLOPPY DISK CABLE 380012-04
POWER ON LED
380016-01
HARD DISK LED 380020-02
PCB MAIN ASSEMBLY 312625-01
TOP COVER
312226-01
BASE CHASSIS 312225-01
30
Page 35
PC10-1/10-2/10-lll SERVICE MANUAL
COMPONENT PARTS LIST
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
U101
FE2010A 318048-01
U102 8088 10MHZ
380200-02
U 104,204,
205,304,
604
74LS245 901521-46
1)108,109
202,603 74LS244 901521-03
11105,106
107 74LS373
901521-29
U1
74LS04
901521-02
U2 74LS08 901521-03
U3
74LS14
901521-30
U325
74S04
901525-01
U328
74LS00 901525-04
U326 74S08 901525-05
U301,302
303 74LS158 318089-01
U327
74S10 901525-06
U207
7406 901522-06
U203 SMC9268 312710-01
U401
OKI6242
318073-01
U402
8250 380205-01
U404
1488 Driver
901882-01
U405
1489 Receiver
901883-01
U601
PVC4 Video
318088-01
U403
PPC1 318091-01
U602
Custom 5720
318087-01
U605,321-
324
64Kx4 Drams 100ns
390083-04
Sub: 64Kx4
390083-05
U305-320
Drams 80ns
256Kx1 Drams 80ns
380223-05
Sub: 256Kx1 380223-04
Drams 100ns
Sub: 256Kx1
380223-03
U607
Drams 120ns
Video Character ROM
318086-01
Sub: EPROM Char
317066-02
U201
ROM 27256
Bios ROM
318085-01
Sub: EPROM Bios
317066-01
U102,103
ROM 27256
Socket, 40 Pin Dip
904150-06
U201,607
Socket, 28 Pin Dip 904150-05
U602
Socket, 68 Pin PLCC
390185-02
U101 Socket, 84 Pin PLCC 390185-01
DIODES
CR401-405
501.601
201.602
1N4148
900850-01
RESISTORS — All values are in ohms-1/4 W
5% unless noted otherwise.
R105 5.1 K ohm 901550-03
R403,405 1M ohm 901550-84
R625.207 10 ohm 901550-64
R103,104,
201-204,408,
412,616,623,
644,639,101,
413,414
4.7K ohm
901550-19
R404,109,
421
33 ohm
901550-105
R401,402,
205,504
470 ohm
901550-58
R407.410 2.2K ohm 901550-18
R409.411
501,641 10K ohm 901550-20
R619,606 1K ohm 901550-01
R601 750 ohm 901550-88
R602.617
680 ohm 901550-31
R603,627 360 ohm
901550-108
R604
130 ohm 901550-134
R605 75 ohm 901550-45
R608.622
607,640 33K ohm
901550-06
R618
2K ohm
901550-53
R620 3K ohm
901550-33
R626 1.2K ohm
901550-17
R628,629
630
68 ohm
901550-94
R505,102
220 ohm
901550-52
R106
1 ohm, 1/2 Watt
901600-36
R107,108
502,503 47 ohm 901550-56
R206 8.2K ohm
901550-05
R645 2.2 ohm, 1/2 Watt
901600-28
RP602 68 ohm, l6Pin 8EI Dip 252134-03
RP301,302
303 33 ohm, 14Pin 7EI Dip
318867-01
RP202,402
33 ohm, 16Pin 8EI Dip
252134-04
RP101.102
501
4.7Kx5 6Pin, SIP
902441-31
31
Page 36
PC10-1/10-2/10-lll SERVICE MANUAL
COMPONENT PARTS LIST (continued)
RESISTORS (Continued)
RP201
220/330x4 6Pin, SIP
380388-01
RP401,603 4.7Kx7 8Pin, SIP
902442-55
RP502.503
504
10Kx7 8Pin, SIP 902442-35
RP203
3.3Kx9 10Pin, SIP 902410-06
RP505
10Kx9 10Pin, Sip 902410-13
RP604
33Kx9 10Pin, SIP
902410-17
RP605
33Kx5 6Pin, SIP
902442-42
Sub: 33Kx7 8Pin, SIP
902441-41
CAPACITORS
C103,406,
602 47pF, MLC, Radial, Cog 900019-17
cm
39pF, MLC, Radial, Cog
900019-14
Sub: 33pF, MLC, 900019-XX
C405.401
Radial, Cog
22pF, MLC, Radial, Cog 900019-13
C202 220pF, MLC, Radial, Cog 900019-19
C408-424
601,110
100pF, MLC, Radial, Cog
900019-15
C511-540,
104,105,
106,109,
603-610
10OOpF, MLC, Radial, X7R
900014-06
C802,803
760,761,
762,766-
776,800,
748,753,
757,404,
701-719,
723-726,
747 ,1/iF, MLC, Radial, Z5U
900020-01
C701 only
Sub: .1/iF, MLC,
390082-01
C727-746
107,108,201
Axial, Z5U
.33/tF, MLC, Radial, Z5U
900020-09
C508
.22/4F, MLC, Radial, Z5U 900020-08
C403
4.7/iF, Alum, Elec, Rad
390101-05
C501,502
504,505,
507,542-
547
47/*F, Elect, Rad 16V
390101-01
C503,541 VF, Elec, Rad, 50V
390101-08
C402 Varcap, 4-20pF
251029-01
MISCELLANEOUS
XTAL2 Crystal 32.768 KHZ 900560-01
XTAL3
Crystal 1.832 MHZ, HC18U
900556-13
OSC201 OSC 16MHZ 325566-10
OSC601
OSC 16.257 MHZ
325566-13
OSC602
OSC 24000 MHZ 325566-15
OSC101
OSC 28.63636 MHZ
325566-12
VR501
Regulator 7905 -5V
901527-03
PZ101
Piezo Beeper 312680-01
EMI401-425,
608,609
EMI Filter, 100pF
251842-02
BT601 Battery, Nicad 3.6V 380393-01
JMP204,208 Header 3 Pin Sil
903326-03
JMP101,205-
207,614,
CN504,203
Header 2 Pin Sil 903326-02
Shorting Blocks 2 Pos
390043-01
CN201
Header 34 Pin Dil 903345-17
CN202 Header 40 Pin Dil
903345-20
FB104,101,
201,601-611,
105 Ferrite Bead 903025-01
FB601
Ferrite Bead (Loose) 390268-01
SW501 Switch No, PB 251260-01
SW601
Switch 4 Pos 8 Pin Dip Levr 252144-04
FB102,103 Ferrite Bead (Three Turn)
390253-02
EMI101.102,
105,607, EMI Filter,
610-614
DSS310-5Y5S101M
390257-02
EMI101,102,
607,610-614
PC10-III EMI ASSEMBLY (1) 312777-01
EMI105
PC10-III EMI ASSY (2)
312777-02
CONNECTORS
CN102
Din 5 Pin Round Female
252166-01
CN401
D-Sub 25 Pin Female
390241-05
CN402
D-Sub 25 Pin Male
390242-05
CN601
D-Sub 9 Pin Male
390242-01
CN602
D-Sub 9 Pin Female
390241-01
CN603
Jack RCA Female RT4
252122-01
CN501-503
Conn 62 Pin 903446-02
CN12
Conn Power
903349-01
TRANSISTORS
Q602
2N3906 PNP
902707-01
Q101,104,
106
2N3904 NPN
902658-01
32
Page 37
PC10-1/10-2/10-lll SERVICE MANUAL
BOARD LAYOUT
GRAY
BLACK
PCI 0c BOARD \cra gg
n/W 312628 REV 5 era cn~~ era a
___
__
lryv
___
TF1*1
1 }
lOM
1 <1
1 <1
UM
1 i
\a*>
1 i
LOt»
1 ^
tmi
1 i
1 4
COMMODORE 10-4-87
fl/W 312628 REV 5
PC10C 90RRD
SILKTOP
33
Page 38
PC10-1/10-2/10-lll SERVICE MANUAL
C702
. luF
NMI c * -
INT c>2—
PCLOCK o*-
REflDT or-
UG
VCC S6/R19
1
[1^
GND
GND0
S5/R18
S4/R17
33
MN/MY '
H 1 b
A1 5
R14
R13
A12
fill
fl 10
R9
32
RD '
8088
29
17
U1G2
LOCK'
NMI
R8
RD7
RD6
RD5
RD4
18
I NTR
3U
SSQ '
RD3
RD2
RD 1
RDQ
19
CLOCK
rg ' /run'
22
RERDT
TEST’
21
RESET
QS0
QS1
SO'
SI '
S2'
RQ'/G Ti'
CLERR
j o RE SET
SET
R107 ncr
—-c> 0 s c
vcc
.1 .1 .1
C7G4 C705 C70S
■D RLE
TC
* o N DR CKQ'
NDRCK 1 '
-O NDRCK2 ’
NDRCK3 1
U 1 09
74LS2M4
28 .636MHZ
OSC10
Schematic #312626
Sheet 1 o f 6
34
Page 39
PC 10-1/10-2/10-111 SERVICE MANUAL
0SC 2G1
16MHZ~£
9
8
7
</5—
6
5
4
3
/(
25
S ’—
~
24
21
l/TB
23
</rT~
2
26
(/ldJM P 2 0 4 <j V C C
27
I— *
S\ 4 JMP205
20
k s - ° ®
22
NEPSL'
U202
J204 TJ205 TU20S
.1 To . i 10 .1 *10 .
C712 C713 C 714
1 7 .1 7 .1 7 .1 7 .! 7
C 715 C 716 C717 C718 C719
Schematic #312626
Sh eet 2 of 6
35
Page 40
PC10-1/10-2/10-lll SERVICE MANUAL
Schematic #312626
Sh eet 3 o f 6
36
Page 41
PC10-1/10-2/10-lll SERVICE MANUAL
+ 12V
Schematic #312626
Sheet 4 o f 6
37
Page 42
PC10-1/10-2/10-lll SERVICE MANUAL
IN 4 1 4 8 A
CR5G 1 -
P C P O W E R
C N 5 0 6
POWEAGOOO
7 9 0 5
VR5G 1
1UF^
C503
X X
IN OUT
GNO
T
47UF ^ i 47UF ± ±1
C 5 0 4
X X
C507
T C^ 8 ¥ IWs
-5V
U3 U206
7»HS14 71406
------
t> -1 2 V
- o +12V
47UF
C505
C501 C542 C544 C547
47UF 47UF 47UF 47UF
C502 C543 C545
47UF 47UF 47UF
R5° 3 CN505
--
W V--O © — -n
1 470 2 *
7 s*-
RESET o 1—
V.CC
IRQ2 [>■
7 sr
C512 X
1000PF^
-5V o 2-
7*-
7^~
DRQ2 o 1—
C513 i IOW
IQ0GPF V -12V oi_
7 * “
7*r
s VCC
vcc
NMEMU'o*-
NMEMR' o 1-
NIOW ' o»-
NIOR' o*-
^12Vo_
7 ^ -
7 ^ -
7?T-
7*-
7fH“
T 7'
NDRCK3 ' o 2—
DR Q 3 o 2—
C514 5
IQQQPF
7TT-
7K-
NOflCKl ' o -
775-
DRQ 1 o 1-
CLOCK
I RQ7o>-
R502
- A / W -
47
^ C515
100OPF NDflCKO ' o -
C5l6 ^ IRQ6 o-r—
1000PF t
C517 ^ t
innnpp 1
RQ5o
C518
lQOOPF
I
I RQ4oi ^
-----------------
C520 X
1000PF^ NDAC^'o1-
TC r-sr_
ALE □>!_
VCC
OSC o*—
R503
------
A A A r
1 47
7^3“
7 ^ -
Ttr
7 ^
7*~
7T
v r
T*-
F
7^
F
RESETIN ’
_j VCC
GNDl I0CHK .
RESORV
07 .
5V1
06
I RQ2
□5
-5V0C
04
0802
03
-12V
02
-CD SEl
01
12V
DO
GND2
IOREROY
-HEMW AEN
-HENR
A19
-IOW
A18
-108
R17
-DACK3
A16
0RQ3
ft 15
-0ACK1
A m
0RQ1
A13
-OACK0
A12
CLK
A1 1
1807
A10
1805
A9
1805
A8
IRQ4
A7
1803 AS
-DACK2
A5
T/C R4
ALE
A3
5V2
A2
OSC
A1
GN03
A0
VCC
i f f * ,
RP505
10K
TSs CS34 IG00PF
~ ^ C5 32 1060PF|
^ -
________It_____________
TS\ Q531 1B00PF
n r
L4
i \
L5
17 '
10
l3 s
19
» N
ltK
22
23
24
25
26
27
*s
26
2s ,iN
30 '
N
31
C N 5G 1
EXPANSION
-*□ AEN
-^o IOREADT
VCC
RP5Q2
10K
C533
-4-
C5^g 16Q0PF
-C 5- | i L0O0PF
~C~sll l00BPF
VCC
RP503
1GK
VCC
RP504
1 OK
BEXPAN(30:0)
/zr
43
/1T-
44
45
/rr
UP
A T
/n-
/n r
49
7*~
/fT”
59
LfET
52
5
Z ^
GN01
I0CHK
RESD8V
07
5V1
06
IRQ2
05 ■
-5V0C □4 ■
□802
03 ■
-12V
02 ■
-CO SEL
01 ■
12V 08
GND2
IOREADT
-MEhW
AEN
-MEMR
A19
-IOW
A10
-I0R
A17
-DACK3
A16
0RQ3
A15
-OACKl
A14
ORQl
A13
-0ACKG
A12
CLK
A1L
IRQ?
A3 0
1RQ6
A9
IRQ5
A8
1804
A7
1 RQ3
A6
-DACK2
AS
T/C
A4
ALE
A3
5V2
A2
OSC
Al
GND3
AO
. v
_ y
_ v
C N d G 2
EXPANSION
7T-
/*-
/X-
A r
/*-
I
Z ^
/&-
4
I^F -
4
/rr
u
/*-
U F -
48
/n r -
49
/TT—
50
/f ir
A “
Z~
7~
Z~
A -
Z ^
A “
A~
Z-
A~
CNOl
I0CHK
RESORV
D7
5V1
06 ■
IRQ2
05 ■
-5VDC
04 -
0RQ2 03 -
-12V
02
-CD SEL
01
12V DO
GN02
IOREADT
-MEHW AEN
-MEMR
A19
-IOW
A16
-I0R
A17
-DACK3
A16
0RQ3
A15
-0ACK1
A14
ORQl
R13
-DACKQ
A12
CLK
Al 1
IRQ7
A10
IROS
A9
IRQ5
A8
- IRQ4
A7
. IRQ 3 A6
- -0ACK2
A5
- T/C
RU
- ALE
A3
- 5V2
A2
■ OSC
AL
- GN03
A0
_ y
_ y
_V
_j7
-t>n
-IF ,
- r ^
-T N
-T N
-Hn
-* N
"A
"A
" A
“ N
‘ TN
LI N O U J
EXPANSION
-*o
-»<□
Schematic #312626
Sheet 5 of 6
NIOCHK'
BDATA (7:03
BADDR (19:03
38
Page 43
a: cn
PC10-1/10-2/10-lll SERVICE MANUAL
BRDDR (19:0) o
IDRTfi (7:0)
IRG2
I RGB
IRQ'4
IRQS
NIOR'
REN
MOW'
COMINT
OUT 1 '
IOR-DLY
ION-DLT
LPTCS '
URRTCS'
FDCCS'
HDCS '
RTCLOCKCS
CN6 01
OB 9
i o 1 d
Schematic #312626
Sheet 6 of 6
39
Page 44
PC10-1/10-2/10-lll SERVICE MANUAL
PC10-III, PC20-III, MEMORY MAP
MEMORY ADDRESS (HEX) CONTENTS
00 00
00
03
FF FF 640K Base Ram
04 00 00
09
FF FF
0A 00 00
EGA/VGA Video Ram
0A FF
FF
OB 00 00 Monochrome Video
OB
3F FF
OB
40 00 Reserved
OB 7F FF
OB
80 00 Color Video
OB FF FF
OC 00 00 Reserved for EGA Bios
OC
7F FF
OC 80 00 Available
OC
9F FF
OC
AO
00 Reserved
OF
7F FF
OF
80
00
CBM 8088 Monitor
OF 9F
FF
OF
AO
00
Hard Drive Bios
OF BF FF
OF
CO 00
16K Main Bios
OF FF FF
40
Page 45
PC10-1/10-2/10-lll SERVICE MANUAL
The PC10-III, PC20-III and Colt have a built in monitor, in addition to the debug monitor in the operating
system.
The Commodore 8088 monitor may be entered when an error condition is detected on power up tests
by pressing the control key in combination with the ‘M’ key (cntrl M).
You may examine the monitor by leaving the boot disk out of system at power up, a system message
will appear on console:
Boot disk failure. Type key to Retry.
Press control ‘M’ to enter CBM monitor.
System will respond with:
Commodore 8088 Monitor
Pre-release version 2.0
Copyright 1987 Commodore Technology Group
Use ? for help
Responding with a question mark, return, will generate the following monitor options:
Dump [starting addr]
Fill [starting addr] [count] [data]
Goto [addr] break pointl] [break point2]
Input port [byte : word] [port addr]
Output port [byte : word] [port addr] [data]
iNterrupt [#hex]
Move [source addr] [dest addr] [count]
Substitute memory [addr]
Trace
examine [register]
Boot
Register addresses conform to PC industry standards for compatibility.
PC10-III, PC20-III, COLT CBM 8088 MONITOR
41
Page 46
PC10-1/10-2/10-lll SERVICE MANUAL
A new bios ROM for the PC10-III, PC20-III and Colt is being released. New part number is 318085-02.
This is an in-line upgrade and must be purchased by the end user directly through an authorized ser
vice center. Installation of this IC must be done by a Commodore authorized technician.
The following summary details changes in bios 4.36.
1) 9600 Baud problem
Terminal and communications software packages which used interrupt-driven COM:, dropped
characters.
FIX: Code intented to simulate the keyclick corrected
2) Equipment check
Bios int 11 h returns 40 column status when in 80 column mode and 80 column status when
in 40 column mode when running in CGA mode.
FIX: Bios modified to return correct color mode number.
3) F11 and F12 keys
Bios int 16h returns incorrect scan codes for function keys F11 and F12.
FIX: Keyboard table was corrected.
4) New microsoft bus mouse
Bios autoconfig(TM) did not recognize newest microsoft bus mouse. Result incorrect operation
of entire system.
FIX: Bios now tests for either type of mouse before enabling on board mouse.
5) EGA board problems
Several EGA cards exhibited memory conflicts with PVC4 controller.
FIX: PVC4 video controller will be disabled if a special video adapter bios module (EGA, VGA,
ETC.) is found.
6) IBM 3270 card
IBM 3270 cards did not function
FIX: Patch code in int 1A.
7) HD Boot speed
Hard drive takes too long to boot.
FIX: Latest bios improves load time.
8) IBM 5250 card
Upload, download problems with 5250 emulator to IBM system 38.
FIX: Patch code in int 1A.
9) OKI Real-time clock chip problems
RTC register altered by unauthorized system code.
FIX: RTC initialization code modified.
10) Cold boot from S/W
Programs which issue a call to the bios cold boot location (F00:E05B) or the hardware reset
vector (FFFF:0000) will hang (EXAMPLE — MSDOS FDISK).
FIX: Cold and warm boot code modified.
11) System crash
Unexpected interrupt causes system to crash or hang up after prolonged use.
FIX: Modified unexpected interrupt code.
12) Enhancement of onboard base memory configuration if offboard memory is found from OK to
640K the corresponding onboard memory bank is disabled. If no offboard memory is found,
then onboard memory is configured to 640K.
PC10-III, PC20-III BIOS 4.36 RELEASE NOTES
42
Page 47
FOR REFERENCE ONLY
OEM SCHEMATIC
CIRCUIT DIAGRAM
Num Scr C ap
PC10-III K EYB O AR D
Assembly 0312702-02
CO
PC10-1/10-2/10-111 SERVICE MANUAL
Page 48
FOR REFERENCE ONLY
OEM SCHEMATIC
D6
PC10-III PO W ER SU P P LY
Assembly 0312637-02
PC10-1/10-2/10-111 SERVICE MANUAL
Page 49
PC10-1/10-2/10-111 SERVICE MANUAL
FOR REFERENCE ONLY
PSM-763 P.C.B. LAYOUT COMPONENT SIDE
(PHIHONG PSM-763)
Assembly 312637-02
PC10-III PO W ER S U PPL Y
cn
Page 50
PC10-1/10-2/10-M SERVICE MANUAL
PARTS LIST
POWER SUPPLY #312637-02 (PHIHONG PSM-763) PC10-III
OEM Part #
Description
Loc.
001052000
Rectifier FD S5KC20 REC2
001010500 Rectifier STKD S10SC4M
REC3
001004201
Transistor TIP 42A Q4
900756-06
Rectifier BD-2KBP06M
REC1
001063951 SCR 2N6395 SCR
901523-12
IC LM339N IC3
901527-05 IC UA7912UC IC2
001004101
Transistor TIP 41A
Q2
001071301
Photo Coupler PC-713V2
PC
001043101 IC TL431CLP SHR
NOTE: COMPONENT PARTS NOT AVAILABLE FROM COMMODORE PARTS DEPARTMENT.
FO R R E F E R E N C E O N LY
46
Page 51
r
Commodore
Computer Systems Division
1200 Wilson Drive
West Chester, PA 19380
J
Page 52
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