C64_Service_Manual_314001-02_1985_Sep.pdf

SERVICE MANUAL

MODEL C64 COMPUTER

SEPTEMBER 1985 PN-314001-02

Commodore Business Machines, Inc.

1200Wilson Drive, WestChester, Pennsylvania 19380U.S.A.

Commodore makes no expressed or implied war

ranties with regard to the information contained

herein. The information is made availablesolelyon

an as is basis, and the entire risk asto quality and

accuracy iswiththeuser. Commodoreshall notbe

• .liable for any consequential orincidental damages

in connectionwiththe useofthe 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.

Reproductionoruse without expressed permission,

of editorial or pictorial content, in any matter is

prohibited.

This manualcontains copyrighted and proprietaryinformation. 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 oermis-

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

• 20K ROM Standard (includes operating system and BASIC

interpreter)

ROM

• 651OA Microprocessor-1.02 MHz clock • Compatible with

the 6502

MICROPROCESSOR

DISPLAY

• 40 Columns X 25 lines of text

• 16 Background, border and character colors

COLORS

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

characters • All PET graphic characters

CHARACTERS

• Text characters • High resolution graphics

DISPLAY MODES

RESOLUTION

• 320 X 200 Pixels

SPRITES

• 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

• 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 soundinput

SOUND

• Full size typewriter style design

KEYBOARD

• 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

• User port • Serial port • ROM cartridge port • 2 Joystick/

paddle ports • Video port • C1530 Cassette drive interface port

INPUTS/OUTPUTS

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

functions • Full screen editor

FEATURES

• C1541 Diskdrive • C1530 Datasette

printer • MPS 802 Dot matrix printer •

printer • DPS 1101 Daisey wheel printer

Plotter/Printer • C1702 Color monitor •

• MPS 801 Dot matrix

MPS 803 Dot matrix

• C1520

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

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

Capacitors, Connectors)shouldbesecuredlocally.Approvedcross-referencesforTTLchips.

Transistors,etc.willbeavailablein manualformthroughtheService Departmentin November

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

on the parts list by a "C".

TOP CASE ASSY

Top Case

Keyboard

LEO 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

C 326114-01

C 950157-04

C 326131-01

C 326288-01

Bottom Case

Foot, Self-Adhesive

PCB Shield Plate

PCB Insulation Sheet

ACCESSORIES

Users Manual

Power Supply

RF Cable

Switch Box

C 320974

C 251053-02

C 326189-01

C 904778-01

C-64 BLOCK DIAGRAM

ADDRESS

DECODING

PLA

EXPANSION

PORT

CASSETTE

PORT

6510

MICRO

DATA BUS

BASIC

ROM

PADDLES

ADDRESS BUS

MOD

J L

SID

CHIP

SYNC

CHROMA

LUMA

KERNAL

ROM

6567

VIC

CHIP

MONITOR

CHARACTER

GENERATOR

ROM

64K ROM

KEYBOARD

MATRIX

6526

CIA

CONTROL

PORTS

USER

PORT

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