Atari 1200 XL Guide de démarrage rapide

Printed in U.S. America Atari, Incorporated FD100217

February 1983 ev. by jer/eightbitter

2014

Atari believes that the information described in this manual is accurate and reliable,

and much care has been taken in its preparation. However, no responsibility, financial

or otherwise, shall be accepted for any consequences arising out of the use of this

material. Information contained herein I subject to change. Revisions may be issued

to advise of such changes and or additions.

Correspondence regarding this document should be forwarded to Manager of Technical

Support, Consumer Product Service, Atari, Incorporated, 845 W. Maude Avenue, Sunnyvale,

CA 94086

TABLE OF CONTENTS

Section Title Page

INTRODUCTION V

1 THEORY OF OPERATION ~ 1-1

User Interface 1-2

Mechanical Description 1-3

Digital Hardware 1-5

6502 (Modified) CPU Microprocessor 1-5

Alphanumeric Television Interface Controller 1-6

(Antic Display Processor)

Graphics Television Interface Adaptor (GTIA) 1-7

POT Keyboard Integrated Circuit (POKEY) 1-8

Peripheral Interface Adaptor (PIA) 1-9

Memory (ROM and RAM) 1-11

Memory Management Unit (MMU) 1-11

RF Modulator 1-11

Power Supply 1-11

System Interface 1-11

Serial Input Output (SIO Interface) 1-12

Keyboard Interface 1-13

Controller Jack Interface 1-14

Cartridge Interface 1-15

Monitor Interface 1-16

LED Board Interface I-16

2 SCHEMATICS AND SILKSCREENS 2-1

Drawings 2-2 to 2-12

3 TESTING 3-1

Overview 3-1

Equipment Needed 3-1

Self Test 3-1

MEMORY TEST Screen 3-2

AUDIO VISUAL TEST Screen 3-2

KEYBOARD TEST Screen 3-3

ALL TESTS 3-3

Using the SALT 2.05 Diagnostic Cartridge 3-3

COLOR BAR TEST 3-6

ANY VIDEO TEST 3-7

GRAY BAR TEST 3-g

DISPLAY OPTIONS 3-9

RAM TEST 3-9

1200XL Home Computer III

Field Service Manual

TABLE OF CONTENTS (Cont)

Section Title Page

4 SYMPTOM CHECKLIST 4-1

Adjustments & Replacements 4-3

Console Disassembly 4-3

Console Assembly 4-3

Keyboard Removal Replacement 4-4

RF Modulator Adjustment 4-4

Sound Adjustment 4-4

Color Adjustment 4-4

5 1200XL PARTS LIST 5-1

6 SERVICE BULLETINS 6-1

TABLE OF ILLUSTRATIONS

Figure Title Page

1-1 1200XL Left Side Panel 1-1

1-2 1200XL Back View 1-2

1-3 1200XL Functional Block Diagram 1-4

1-4 6502 (Modified) CPU Pin Assignments 1-6

1-5 ANTIC Display Processor Pin Assignments 1-7

1-6 GTIA Pin Assignments 1-8

1-7 POKEY Pin Assignments 1-9

1-8 PIA Pin Assignments 1-10

1-9 SIO Interface Pin Assignments 1-13

1-10 Keyboard Interface Pin Assignments 1-13

1-11 Controller Jack Interface Pin Assignments 1-14

1-12 Monitor Interface Pin Assignments 1-14

1-13 Cartridge Interface Pin Assignments 1-15

3-1 SALT Header 3-4

3-2 SALT Menu 3-4

3-3 COLOR BAR Test Screen 3-5

3-4 ANY VIDEO Test Screen 3-6

3-5 GRAY BAR Test Screen 3-7

3-6 Display Option Screen 3-7

3-7 RAM TEST Screen 3-9

4-1 1200XL Console and RF Shield 4-2

1200XL Home Computer

Field Service Manual IV

INTRODUCTION

The Atari 1200XL Computer Field Service Manual is a reference guide for the service

technician.

This Field Service Manual is organized in six sections:

•THEORY OF OPERATION - Overview of how the 1200XL works and what its basic

assemblies look like.

•SCHEMATICS AND SILKSCREENS - Electrical drawings and layouts of the 1200XL

printed circuit board.

•TESTING - Review of Diagnostic Tests available for diagnosing 1200XL problems.

•SYMPTOM CHECKLIST - Failure information to assist the experienced technician

arrive at a rapid diagnosis of 1200XL pcoblems.

•PARTS LIST - Detailed breakdown of all parts used in the 1200XL.

•SERVICE BULLETINS - Section to be used to hold Field Change Orders, Upgrade

Bulletins and Tech Tips.

1200XL Home Computer V

Field Service Manual

SECTION 1

THEORY OF OPERATION

The Atari 1200XLTM is an enhanced version of the existing Atari computer systems. It can be

used with any existing Atari peripheral devices which are compatible with the 400TM 800TM

computer, although not all are necessary.

The console contains 64K of RAM and has an operating system which contains two 8K X 8

ROMs. The console also contains the keyboard with a HELP key, four application function

keys, a single cartridge slot, connector jacks for adding peripherals and hand controllers, a

detachable (RF) TV interface cable and three status LED's.

Use Figures 1-1 and 1-2 as reference for the following discussion.

Figure 1-1. 1200XL Left Side Panel

1200XL Home Computer

Field Service Manual 1-1

Figure 1-2. 1200XL Back View.

User Interface

The Atari 1200XL is a general purpose microcomputer which uses a 6502 (modified)

microprocessor. The 1200XL console is the central processing unit for its respective system.

The left side panel (refer to Figure 1-1) contains the power ON OFF switch, one cartridge slot

and two controller jacks. The controller jacks accept the X-Y joystick and the paddle controllers

available from Atari.

The rear panel (refer to Figure 2-1) contains the Serial Input Output (I O) jack, the RF cable

jack, the monitor jack, the channel 2-3 switch, and the Power Jack.

The console has a full stroke 54 key alphanumeric keyboard, which includes special characters

and controls, a space bar, three LED indicators, and 11 function keys.

The 11 function keys above the keyboard are made of brushed and formed aluminium

nameplate material. A translucent plexiglass strip above the function keys indicates the

operation (function) and covers the three LEDs.

1200XL Home Computer

Field Service Manual 1-2

From left to right the function keys and LED indicators are:

RESET - Interrupts and restarts the operating system or cartridge.

POWER - Lights when Power to the unit is ON.

L1 - Lights if the keyboard is disabled.

L2 - Lights if the International character set is selected. START - Starts the game or program.

SELECT - Selects different games.

OPTION - Allows the player to choose among the variations of a program.

F1-F4 - User programmable function keys. The following functions are only applicable when

software, such as BASIC; is inserted.

Press F 1 to move cursor up.

Press F2 to move cursor down.

Press F3 to move cursor left.

Press F4 to move cursor right.

HELP - Press to display self-test options.

- Inverse Video

BREAK - Used for interrupt of program.

Mechanical Description

The 1200XL computer console contains a single motherboard which houses all the chips of the

system and provides connectors for interfacing external modules to the console. It includes the

CPU, RAM, ROM Operating System and power supply, and includes all functions except for

the keyboard and LED display. The motherboard uses a common address bus, data bus and

clock lines. The sixteen-line address bus allows the microprocessor to directly address 64K of

memory locations. The eight-line data bus provides the communication and data path between

the functional modules. The various power requirements are routed from the power supply

throughout the console.

The keyboard is connected to the PC Board by a 15-conductor ribbon cable terminating in a

molex connector. The LED board is connected to the PC Board by a 5-conductor ribbon cable.

Figure 1-3 is a block diagram of the functional flow of the 1200XL.

1200XL Home Computer

Field Service Manual 1-3

Figure 1-3. 1200XL Functional Block Diagram.

1200XL Home Computer

Field Service Manual 1-4

Digital Hardware

The digital hardware consists of:

•The 6502 (modified) CPU microprocessor

•The Alphanumeric Television Interface Controller (the ANTIC Display Processor)

•The Graphics Television Interface Adaptor (GTIA)

•The POT Keyboard Integrated Circuit (POKEY)

•The Peripheral Interface Adaptor (PIA)

•The Memory (ROM and RAM)

•Miscellaneous Iogic

•Memory Management Unit (MMU)

•Delay Line

6502 (modified) CPU Microprocessor

The 6502 (modified) CPU microprocessor contalns register flags, interconnections, arithmetic

logic, control logic, and all recognized operation codes. The characteristics of the

microprocessor are:

•Byte-oriented structure

•151 opcodes

•Decimal and binary arithmetic modes Seven addressing modes

•True indexing Stack pointer

•Two interrupt levels 64K address range

•Integral clock circuit

•Single +5 volt DC power Requirement

Figure 1-4 is an illustration of the 6502 (modified) CPU Pin Assignments.

1200XL Home Computer

Field Service Manual 1-5

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