Commodore C64 Manuel utilisateur

SERVICE MANUAL

MODEL C64 COMPUTER

FEB. 1985 PN-314001-02

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

arecommendation, 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 aretrieval 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.

CONTENTS

Title Page

SPECIFICATIONS

PRODUCT PARTS LIST

BLOCK DIAGRAM

CIRCUIT THEORY

POWER SUPPLY

RESET LOGIC

CLOCK CIRCUITS

I/O, ROM, EXPANSION PORT

RAM CONTROL LOGIC

5 PIN VIDEO AND AUDIO OUTPUTS

8PIN VIDEO AND AUDIO OUTPUTS

CASSETTE INTERFACE

KEYBOARD, JOYSTICK &PADDLE INTERFACES

SERIAL INTERFACE, USER PORT

TROUBLESHOOTING GUIDE

BOARD IDENTIFICATION

PCB ASSEMBLY #326298-01

BOARD LAYOUT 18

PARTS LISTS 19'20

PIN ASSIGNMENTS 21

SCHEMATIC #326106 21 '22

PCB ASSEMBLY #250407-04

BOARD LAYOUT 23

PARTS LIST 24'25

MODULATOR SCHEMATIC #251025 26

SCHEMATIC #251138 26'27

PIN ASSIGNMENTS 27

PCB ASSEMBLY #250425-01

BOARD LAYOUT 28

PARTS LIST 29'30

MODULATOR SCHEMATIC #251696 31

SCHEMATIC #251469 31 >32

PIN ASSIGNMENTS 32

C64

GENERAL DESCRIPTION

MEMORY

ROM

MICROPROCESSOR

DISPLAY

COLORS

CHARACTERS

DISPLAY MODES

RESOLUTION

SPRITES

SOUND

KEYBOARD

KEYS

INPUTS/OUTPUTS

FEATURES

PERIPHERALS

POWER REQUIREMENTS

COMPUTER

The "All Purpose" Commodore 64 is the complete computer for

education, home or small business applications. Supported by

quality peripherals and afull range of software, the Commodore 64

is perfect for the family. No other computer can offer such variety

of uses and applications at such an affordable price.

64K RAM

20K ROM Standard (includes operating system and BASIC

interpreter)

651 OA Microprocessor— 1.02 MHz clock •

the 6502

40 Columns X25 lines of text

16 Background, border and character colors

Compatible with

Upper &lower case letters, numerals and symbols

characters •All PET graphic characters

Reverse

Text characters

320 X200 Pixels

High resolution graphics

8independent sprites •Each consists of 24 X21 pixels and

up to 4colors •Each independently expandable horizontally

and vertically •Collision detection for sprite to sprite and data

to sprite collisions

•6581 Sound Interface Device includes 3independent tone

generators— each with 9octaves •Each voice includes

programmable ADSR generator (Attack, Decay, Sustain, Release)

and control of sawtooth, triangle, square, variable pulse and noise

waveforms •Full filtering capabilities with low, high and band

pass filters •External sound input

Full size typewriter style design

•66 Keys total •2Cursor control keys •

to 8user defined/programmable functions possible)

lower case character set •Graphic character set

4Function keys (up

•Upper and

•User port

paddle ports

Serial port

Video port ROM cartridge port •2Joystick/

C1530 Cassette drive interface port

•Built-in BASIC 2.0 —over 70 commands, statements and

functions •Full screen editor

•C1541 Disk drive •C1 530 Datasette

printer •MPS 802 Dot matrix printer •

printer •DPS 1101 Daisey wheel printer

Plotter/Printer •C1 702 Color monitor •

•120 Volts, 60 Hz

•MPS 801 Dot matrix

MPS 803 Dot matrix

•C1520

CM141 Color monitor

Specifications subject to change without notice

PARTS LIST

C-64

Commodore part numbers are provided for

indicate the availability of parts from Commodore. Industry standard parts (Resistors

Capacitors, Connectors) should be secured locally. Approved cross-references

Transistors, etc. will be available mmanual form trough the Service Department in November

jue or non-standard parts wilJ be stocked by Commodore and are indicated

the parts

TOP CASE ASSY

Top Case

Keyboard

LED Plate

Nameplate

Lamp Holder Set

LED Assembly

C326113-01

C326166-02

C326160-01

C326161-01

C903820-03

C1001039-01

BOTTOM CASE ASSY

Bottom Case

Foot, Self-Adhesive

PCB Shield Plate

PCB Insulation Sheet

C326114-01

C950157-04

C326131-01

C326288-01

ACCESSORIES

Users Manual

Power Supply

RF Cable

Switch Box

C320974

C251053-02

C326189-01

C904778-01

C-64 BLOCK DIAGRAM

CASSETTE

PORT

PADDLES

Imod r~

SYNC

CHROMA

LUMA

MONITOR

1MEG

Hz 00 ADDRESS

DECODING

PLA

DATA BUS

ADDRESS BUS

6526

CIA

KEYBOARD

MATRIX

EXPANSION

PORT

CONTROL

PORTS

There are three versions of the C64, The C64 with afive pin connector video output {326106),

The C64 with an eight pin connector video output {251 138}, and the C64B which has improved

system clock circuit design (251469). Most circuit theory explanations will be the same for all

three versions. Refer to schematic 326106 unless noted otherwise.

The Power Supply.

The external power supply generates aregulated 5VDC and 9VAC. 5VDC is applied to pins 5and

1of CN7 on the C64 pcb. Filtered by L5,C97, and C100 it is then controlled by on/off switch S1

This 5VDC output supplies the microprocessor logic.

9VAC is applied to pins 6and 7of CN7 on the C64 pcb. +12VDC, +5VDC CAN and 9VDC unregulated

are outputs that are derived from this 9VAC supply. The 9VAC supply is made available on pins 10

and 11of the USER PORT CN2.

12VDC Generation

9VAC is rectified by CR5. The unregulated DC output is filtered by C88 and C89 then regulated at

12VDC by VR1 .The regulated output is filtered by C57 and C59. The 12VDC supplies the VIC and

SID IC, and the audio amplifiers.

C64 CIRCUIT THEORY

VRl

+12

C5S ±: :±' C57

.22 XXIO

--Z51V

C°IO

CR5 470

INJ40OI 50V

>78I2CT

XCRG.

IN400I

UNRE&

CAN +5

4CR4

M08

JTcsi ^CS2

IlOO X-Z2

-16V -

SHIELD GND

9VAC

POWER INPUT

(7 -PIN MALE DIN)CN7

+5VDC CAN Generation

9VAC is rectified by CR4. The unregulated DC output is filtered by C19, and C95 then regulated at

5VDC by VR2. The regulated output is filtered by C102 and C103. The output called 5VDC CAN

is separated and individually filtered into two outputs called Vvid and Vc. Vvid is the 5VDC supply

for the video circuits, and Vc is the 5VDC supply for the clock circuits.

9VDC Unregulated Generation.

CR6 rectifies the 9VAC input. The output is 9VDC unregulated, and not filtered. This supply powers

the cassette motor transistor amplifier circuits, and the RF modulator on the C64B version.

LI 2.ZMH

CAN +5

IO 1.47 X

25V -50V

20%

CAN +5CG5 ±L CGG_

1.47 I

+VviD

50V

20%

+vc

25V

C(*7

50V "

20%

1^7/i/n

50V

C64 CIRCUIT THEORY

+5V

47K

CZ4.+

25V X

R5CMM

+5V

CI05

.\JLf

+5V

U20 740&

Reset Logic Circuits.

U20 is a556 IC timer configured as aone shot multivibrator. The output pulse width is determined

by the size of R34 and C24. Pulse width =1.1 xR34 xC24 -.5 seconds. The output on pin 9

is "high" active. The output of U8 is "low" active. Reset initializes all the processor logic and causes

the processor to load the program counter register with the address of the first instruction of the

operating system program called the KERNAL. The starting address is stored in locations $FFFC and

$FFFD. The first instruction is decoded and executed giving KERNAL control of the computer opera-

tions. The reset pulse occurs when turning the power on to the computer.

_rC83 f

X33pf

"50V

<0 color) PCKlftJP

14.3181 8MHe +Vco-

yccA CB

ft UP U30

>CNTON 74LSI9^

C-L GNP

JLl* J8

LOAD

<0o)

.1 J-<| K

C8G>f

3<\pf 15%

(II 1

14 50Y Is 6"*

<|PT CLOCK)

8.1818 MH*

C64 CIRCUIT THEORY

+Vc

CHARGE

PUMP

MC4044

GOHe

-T-C36

X20pf

~50V

<WAC

74L5#8 1N437I

=2*7V

The C64 Clock Circuits.

Crystal Y1 develops a16MHz fundamental frequency clock signal. U31 is aDual Voltage Controlled

Oscillator. The output on pin 10 is a14.31818 MHz clock signal called the color clock. R27 can be

adjusted to obtain exact output frequency. U30 is afrequency divider that outputs a2MHz signal

on pin 6. U29 is aDflip flop which outputs a1MHz signal on pin 9. U32 is aPhase/Frequency Detec-

tor which compares the output of the U29 to the phase clock, and outputs adc voltage on pin

8that is proportional to the phase difference between the inputs. The second half of the Dual Voltage

Controlled Oscillator U31 generates an 8.1818MHz clock signal called the DOT Clock. The VIC IC

divides the DOT clock by eight and outputs this as the phase clock on pin 17. The output of the

Phase/Frequency Detector is applied to the frequency control input pin 2of U31 .This causes track-

ing of the dot clock and the color clock because one input, pin 3of U32, is the phase clock which

is derived from the dot clock, and the other input pin 1of U32, is derived from the color clock.

fr—

—o_z[_

.- jmactiv£:

OPEN

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U3/

87of

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S. ?mH

Yf:/7.73441 MMI'PAL CL'Ifyf

—<*COLq£) (/7. 73447 MHl~PAD

—^orajXK) (7SS MHi -PAL)

The C64B Clock Circuits. Refer to schematic 251469

Crystal Y1 develops the fundamental 16MHz clock signal. U31 is aClock Generator IC that outputs

the 8.1818MHz DOT clock on pin 6, and the 14.31818 MHz color clock on pin 8.

C64 CIRCUIT THEORY

CTM >

)wfira +fj ia 41 ui P3S3K£THMXr2ZWiJ'HC<i'<-<

if -£(# rwJ>Rj- WN <0—5^

CARTRIDGE /EXPANSION (44 -PiNJ FEMALE) CN&

I/O and ROM Address Decoding and Expansion Port.

I/O Address Decoding Logic.

U17 is aProgrammable logic array (PLA). The output F5 on pin 12 called I/O goes 'Mow" when any

of the I/O devices controlled by U15 are selected. The addresses are listed below for each device.

VIC IC

SID IC

Color Ram

CIA1

CIA2

I/O 1

I/O 2

$D000 -$D02E

$D400 -$D7FF

$D800 -$DBFF

$DC00 -$DCOF

$DDOO -$DDOF

$DEOO -$DEFF

$DFOO -$DFFF

ROM Address Decoding.

"low"

Basic ROM resides at locations $A000 -$BFFF. The output F1 pin 17 of the PLA U17 goes

when the BASIC ROM is selected. The KERNAL ROM resides at locations $E000 -$FFFF. The output

F2 pin 16 of the PLA U17 goes "low" when the KERNAL ROM is selected. The CHARACTER

GENERATOR ROM resides at locations $D000- $DFFF. The output F3 pin 15 of the PLA U17 goes

"low" when the Character Generator ROM is selected.

The Expansion Port Connections.

The expansion port is an extension of the microprocessor address, data, and control bus. ROML decodes

addresses $8000 -$9FFF, and ROMH decodes addresses $E000 -$FFFF. These are outputs from

the PLA used to select the cartridge inserted in the expansion port. I/O 1input from U15 decodes

addresses $DE00 -$DEFF. I/O 2output from U15 decodes addresses $DF00 -$DFFF.

C64 CIRCUIT THEORY

R-31

180-a

SYWCii

LUM

RAM Control Logic.

U13 and U25 are multiplexers. The address outputs from the microprocessor are passed to RAM via

U1 3and U25 when the output Address Enable Control (AEC) from the VIC IC is "high". When AEC

is "low" the VIC IC outputs refresh addresses on pins 24-31. AEC goes "low" when the system

clock, phase 2, is "low". Since all I/O decoding occurs when phase 2is "high", refresh is transparent

to the processor.

Eight 41 64 DRAMS provide 64k bytes of memory. One 2114 RAM (U6) provides 51 2bytes of memory

allocated for screen color data storage.

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