C64-C64C_Service_Manual_314001-03_1992_Mar.pdf

SERVICE MANUAL

C64/C64C

MARCH, 1992

PN-314001-03

Commodore Business Machines, Inc.

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

Commodore makes no express or implied warranties

with regard to the information contained herein. The

information is madeavailable solelyon an as is basis,

and the entire risk asto completeness, reliability, and

accuracy is with the user. Commodore shall not be

liable for any damages in connection with the use of

the information contained herein. The listing of any

available replacement 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 express permission, of

editorial orpictorial content, in anymatteris prohibited.

This manual containscopyrighted and proprietaryinformation. Nopart

ofthispublication maybe reproduced, stored in aretrievalsystem, or

transmitted in anyformorbyanymeans, electronic, mechanical, photo

copying, recording orotherwise, withoutthe priorwritten permission

of Commodore Electronics Limited.

Printed in U.S.A.

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

CONTENTS (continued)

Title

Page

SERVICE REFERENCE DIAGRAM B-3

B-3 PCB PARTS LIST

B-3 BOARD LAYOUT

B-3 SCHEMATICS #252278

SERVICE REFERENCE DIAGRAM - E

E PCB PARTS LIST

E BOARD LAYOUT

E SCHEMATIC #252312

C64

COMPUTER

GENERAL DESCRIPTION

• 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.

MEMORY

• 64K RAM

ROM

• 20K ROM Standard (includes operating system and BASIC

interpreter)

MICROPROCESSOR

• 6510A Microprocessor—1.02 MHz clock • Compatible with

the 6502

DISPLAY

• 40 Columns X 25 lines of text

COLORS

• 16 Background, border and character colors

CHARACTERS

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

characters • All PET graphic characters

DISPLAY MODES

• Text characters • High resolution graphics

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

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

KEYS

• 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

INPUTS/OUTPUTS

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

paddle ports • Video port • C1530 Cassette drive interface port

FEATURES

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

functions • Full screen editor

PERIPHERALS

• 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

POWER REQUIREMENTS

• 120 Volts, 60 Hz

Specifications subject to change without notice.

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