C64_Service_Manual_314001-02_1985_Mar.pdf

SERVICE MANUAL

MODEL C64 COMPUTER

MARCH 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 ofthe 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.

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

8 PIN VIDEO AND AUDIO OUTPUTS

CASSETTE INTERFACE

KEYBOARD, JOYSTICK & PADDLE INTERFACES

SERIAL INTERFACE, USER PORT

TROUBLESHOOTING GUIDE

BOARD IDENTIFICATION

PCB ASSEMBLY #326298-01

BOARD LAYOUT

PARTS LISTS

19,20

PIN ASSIGNMENTS

SCHEMATIC #326106

21,22

PCB ASSEMBLY #250407-04

BOARD LAYOUT

PARTS LIST

24,25

MODULATOR SCHEMATIC #251025

SCHEMATIC #251138

26,27

PIN ASSIGNMENTS

PCB ASSEMBLY #250425-01

BOARD LAYOUT

PARTS LIST

29,30

MODULATOR SCHEMATIC #251696

SCHEMATIC #251469

31,32

PIN ASSIGNMENTS

C64

COMPUTER

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

education, home or small business applications. Supported by

quality peripherals and a full 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.

GENERAL DESCRIPTION

MEMORY

• 64K RAM

ROM

• 20K ROM Standard (includes operating system and BASIC

interpreter)

• 651OA Microprocessor—1.02 MHz clock • Compatible with

the 6502

MICROPROCESSOR

• 40 Columns X 25 lines of text

DISPLAY

• 16 Background, border and character colors

COLORS

• Upper & lower case letters, numerals and symbols • Reverse

characters • All PET graphic characters

CHARACTERS

DISPLAY MODES

• Text characters • High resolution graphics

• 320 X 200 Pixels

RESOLUTION

• 8 independent sprites • Each consists of 24 X 21 pixels and

up to 4 colors • Each independently expandable horizontally

and vertically • Collision detection for sprite to sprite and data

to sprite collisions

SPRITES

SOUND

• 6581 Sound Interface Device includes 3 independent tone

generators—each with 9 octaves • 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

KEYBOARD

• Full size typewriter style design

• 66 Keys total • 2 Cursor control keys • 4 Function keys (up

to 8 user defined/programmable functions possible) • Upper and

lower case character set • Graphic character set

KEYS

Serial port • ROM cartridge port • 2 Joystick/

Video port • C1530 Cassette drive interface port

INPUTS/OUTPUTS

• User port

paddle ports

FEATURES

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

functions • Full screen editor

• C1541 Diskdrive • C1530 Datasette • MPS 801 Dot matrix

printer • MPS 802 Dot matrix printer • MPS 803 Dot matrix

printer • DPS 1101 Daisey wheel printer • C1520

Plotter/Printer • C1702 Color monitor • CM141 Color monitor

PERIPHERALS

POWER REQUIREMENTS

• 120 Volts, 60 Hz

Specifications subject to change without notice.

PARTS LIST

C-64

PLEASE NOTE: Commodore part numbers are provided for reference only and do not

: Commodore part numbers are provided for reference only and do

Commodore. Industry standard parts (Resistors

stors,

of 1984. Unique or non-standard parts will be stocked by Commodore and are

TOP CASE ASSY

Top Case

Keyboard

LED Plate

Nameplate

Lamp Holder Set

LED Assembly

C 326113-01

C 326166-02

C 326160-01

C 326161-01

C 903820-03

C 1001039-01

BOTTOM CASE ASSY

Bottom Case

Foot, Self-Adhesive

PCB Shield Plate

PCB Insulation Sheet

C 326114-01

C 950157-04

C 326131-01

C 326288-01

ACCESSORIES

Users Manual

Power Supply

RF Cable

Switch Box

C 320974

C 251053-02

C 326189-01

C 904778-01

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