Atari Mega 2 User manual

LIST OF

SECTION

TABLE OF CONTENTS

ILLUSTRATIONS

ONE--INTRODUCTION

Main Conponents

Case design

Differences from 520l1040ST

TWO..THEORY OF OPERATION

Overview

Main Systen

Microprocessing unit

GIue

Main Menory

Direct l4enory Access

MFP Interrupt Control

Audio/Video subsystem

Video Shifter

Video Display Menory

GIue

Memory Control-Ler

Sound Synthesizer

Video Interface

Input/output subsystens

MIDI

Intelligent Keyboard

Parallel Interface

RS232 Interface

Disk Drive Interface

Hard Disk Interface

Systen Startup

System Errors

Functional block diagran

Systen clock diagra-m

t.2

I.5

2.t

2.2

2.3

2.4

2.5

2.6

2.8

2.9

2.70

2.Lt

2.L2

2.L3

2.t4

2.15

2.L6

2.t7

Mega Service Manua1 i.1 Table of Contents

SECTION THREE--TESTING THE MBGA

Overview

Test equipnent

Test Configuration

Trouble-Shooting a dead unit

ST Diagnostic Cartridge

Power-up

RAM test

ROM test

Color test

Keyboard test

MIDI test

RS232 test

Audio test

Tining test

DMA test

Floppy Disk test

Printer/Joystick test

High Res Monitor

Blitter test

Clock test

Expansion port test

Error Codes Quick Reference

SECTION FOUR--DISASSBMBLY/ASSEMBLY

SECTION FIVE-.SYMPTOM CHECKLIST

Display problems

Disk Drive Problens

Keyboard problens

MIDI problems

R5232 problens

Printer Problems

Hard Disk Problens

Real Time Clock Problens

Blitter Problens

3.1

3.2

3.4

3.6

3.7

3.9

3. 10

3. 11

3.r7

3.r2

3. 13

3.t5

3.16

3.L6

3.L7

3.r7

3.18

5.t

5.L

5.2

í.2

Mega Service Manual Table of Contents

SECTION SIX.-DIAGNOSTIC FLOIlICHARTS

SECTION SEVEN..PARTS LIST AND ASSEMBLY DRAWINGS

SECTION EIGHT-.SCHEMATICS AND SILKSCREEI'I

SECTION NINE--GLOSSARY

Mega Service Manual i.3 Tab1e of Contents

LIST OF ILLUSTRATIONS

FIG 1 MEGA COMPUTER

FIG 2 BATTERY COMPARTMEI.IT

FIG 3 BACK PANEL

FIG 4 I,EM SIDE PANEL

FIG 5 TOP OF KEYBOARD

FIG 6 BOTTOM OF KEYBOARD

FIG 7 MEGA MOUSE

FrG I t{oNrron poRr

FIG 9 MIDI PORTS

FrG 10 MoUSE/JOY PoRTS

FIG 11 PRINTER PORT

FrG 12 RS232 PoRT

FIG 13 EXTERNAL FLOPPY PORT

FIG 14 EXTERNAL HARD DISK PORT

FrG 15 FLJNCTTONAL BLoCK DTAGRAM

FIG 16 SYSTEM CLOCKS

1.1

L.2

1.3

r.3

1.4

1.5

2.7

2.8

2.9

2.LO

2.tL

2.L2

2.L3

2.16

2.r7

Mega Service Manual 11 List of Illustrations

SECTION ONE

INTRODUCTION

The Mega 2 and Mega 4 are Motorola MC68000 nicroprocessor based

conputers with sinilar architectures to the 520ST/ 1040ST line. They

are styled as a nain CPU unit with a detached keyboard. The Mega 2 has

2 negabytes of RAM, the Mega 4 contains 4 negabytes. Both the Viega 2

and Mega 4 have a built-in 1 Megabyte (720K fornatted) 3,5 inch floppy

disk drive, and an internal switching power supply with built-in

cooling fan.

Since the onty difference between the Mega 2 and Mega 4 is the

size of its RAM, this nar¡ual will use ' Mega ' as a generic tern which

refers to both products.

Power Light Disk Drive

Drive Busy Light

FIG. 1

COMPUTER SYSTEM

Mega Service Manua1

ItIEGA

1.1 Introduction

The main components of the Mega 2 and Mega 4 are:

CPU

Main board assembly

Disk drive

Power supply & cooling fan

RF Shield (upper and lower)

CPU Plastic case (upper and lower)

KEYBOARD

Keyboard assembly

Interface board assembly

Keyboard Plastics (upper and lower)

MOUSE

Mouse board assembly

Mouse Plastics (upper and lower)

CASE DESIGN

shows the CPU portion

and figure 7 shows the

Figures 1 thru 4

keyboard portion,

Battery Housing

of the IUEGA, 5 ar¡d 6

mouse. shows

the

Cover

size AA Batteries +Top of

Computer

(+)(-)

FIG. 2

BATTERY COMPARTMENT

Mega Service Manual r.2 Introduction

On/Off

lo Power

Frc. 3

BACK PANEL

FIG. 4

LEFT SIDE PANEL

loppy

Printer Midi ln

Cartridge Keyboard

Mega Service Manual 1.3 Introduction

Function Keys

I ¡oyst¡Jx Port I

FIG. 5

TOP OF KEYBOARD

Arrow Keys

Bottom of Keyboard

Calculator

Keypad

Computer

Jack

V I MouseiJoystick

FIG. 5

BOTTOM OF KEYBOARD

Mega Service Manual 1 .ll Introduction

Clicking

Left Mouse

Button

Right Mouse

Button

FrG. 7

MEGA UOUSE

Differences fron 520ST/1040ST

o New version of T0S

o More nenory requiring 74LS243 buffers on MAD lines

o ReaI tine clock chip & support circuit,

o Graphics Co-Processor (BITtsLiT)

o Internal expansion connector & support circuit

o Cooling fan

o New case styling with detached keyboard

Mega Service Manual r.5 Introducti.on

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