Radio Shack TRS-80 Bedienungsanleitung

·-

•

erv1ce

TRS-BO

Color

Computer

Catalog

Number

26-3026/7

CUSTOM MANUFACTURED

U.S.A. BY RADIO SHACK, A DIVISION OF TANDY CORPORATION

-----------TRS-80

-----------

TRS-80®

Color

Computer

Service

Manual

1983

Tandy

Corporation

All

Rights

Reserved

Reproduction

use,

without

express

written

permission

from

Tandy

Corporation,

any

portion

this

manual

prohibited.

While

reasonable

efforts

have

been

taken

the

preparation

this

manual

assure

its

accuracy,

Tandy

Corporation

assumes

liability

resulting

from

any

errors

omissions

this

manual,

from

the

use

the

information

contained

herein.

----------ltad1elllaell----------

Color

Computer

TRS-BO

Service

Manual

TABLE

CONTENTS

General

1.1

Introduction

•......

System

Description

......

Memory

Map .

.............

Specifications

2.1

2.2

2.3

Physical..

Power

.....

Technical.

Disassembly/Assembly

3.1

3.2

3.3

Disassembly

.........

Assembly

....•...........

64K

Upgrade

Instructions.

Theory

Operation

4.1

4.2

4.3

4.4

4.5

4.6

4.7

4.8

4.9

4.10

4.11

4.12

4.13

4.14

4.15

MC6809E

CPU

...

Reset

Circuit

Memory

.......

Video

Generation

Circuitry.

Artifacting

............

PIAs

....•

ROM •

•••••

Keyboard

Interface

DAC

Circuitry

.....

SALT

Circuitry

.•........•.••.

Cassette

Tape

Format

Information

RS232

Connector

(J3)

Cartridge

Connector

(J6).

Power

Transformer

.........

Joysticks

......

4.16

Switch

Box

.•.

Schematic

8000191,

Color

Computer.

Component

Layout

1700235,

Main

Logic

Board

8857636.

Circuit

Trace,

PCB

8857636,

Component

Side

.......

Circuit

Trace,

PCB

8857636,

Solder

Side

Parts

List,

PCB

8857636

................

. .•..

ltadle

lhaell----------

Color

Computer

-----------TRS-BO

Service

Manual

Troubleshooting

Introduction

......................................

Video

Problems

...................................

5.2.1

Display

.......................................

5 . 2 . 2 No

Sync

..........•..................•..•.......•..

5.2.3

5.2.4

5.2.5

5.2.6

5.2.7

"Garbage"

Screen

..............................

Clear

Screen,

Signon

..................•••......

Color

........................................

Wrong

Colors

....................................

Artifacting

Improper

Artifacting

...........

Keyboard

..........................................

5.3.1

Keyboard

Entry

..............................•..

5.3.2

Some

Keys

Inoperative~

...........................

Wrong

Character

for

Key

Pressed

...............•...

Processing

Problems

...............................

5.4.l

General

..........................................

5.4.2

5.5

5.5.l

5.5.2

5.5.3

5.6

5.6.1

5.6.2

5.7

5.8

5.9

5.10

Symptoms

.........................................

Cassette

Problems

.................................

Motor

Control

Problems

.........•....•....•........

Write

Problems

.................................

Read

Problems

..................................

232

Problems

....................................

Output

Missing

Incorrect

......................

Input

Problems

..................................

Sound

Problems

....................................

Joystick

Problems

..................................

Cartridge

Problems

................................

Power

Supply

......................................

Exploded

View/Parts

List

Exploded

View

.......................................

Parts

List

..........................................

Appendices

MC6809E

Data

Sheet

(Motorola

DS9846-Rl)

SN74LS783

Data

Sheet

(Motorola

ADI-595)

MC6847

Data

Sheet

(Motorola

DS9823)

MC6821

Data

Sheet

(Motorola

DS9435-R2)

MC6822

Data

Sheet

(Motorola

ADI-938)

----------

llad1elhaell----------

,..

.·

Color

Computer

Service

Manual

-----------TRS-BO

-----------

Fig.

1-1

1-2

1-3

3-1

3-2

3-3

4-1

4-2

4-3

4-4

4-5

4-6

4-7

4-8

4-9

4-10

4-11

4-12

4-13

4-14

4-15

4-16

4-17

5-1

5-2

5-3

5-4

5-5

5-6

5-7

5-8

5-9

5-10

5-11

5-12

5-13

5-14

Description

Color

Computer

Color

Computer

Color

Computer

Color

Computer

Color

Computer

Color

Computer

Color

Computer

LIST

FIGURES

Page

No.

Installation....................

Block

Diagram...................

Memory

Map

(Page

1).

. . . . . . . . . . . . 6

Memory

Map

(Page

2).............

Memory

Map

(Page

3).............

Memory

Map

(Page

.............

Memory

Map

Page

5).

. . . . . . . . . . . .

Shield

Clip

Location

.............................

Power

Cord

Strain

Relief

.........................

64K

Upgrade.

. . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . .

MC6809E

Programming

Model

........................

MC6809E

Assignments

..•.......................

MC6809E

Read/Write

Timing

0.895

MHz

...........

MC6883

Reset

Circuitry

...........................

DRAM

Block

Diagram

...............................

DRAM

Timing......................................

Color

Computer

Address

Decoding

................

Color

Computer

Artifacting

Circuitry

...........

PIA

Block

Diagram................................

Color

Computer

Keyboard

Array

..................

DAC

Block

Diagram................................

SALT

Block

Diagram

...............................

Color

Computer

Power

Supply

....................

I/O

Circuitry....................................

RS-232C

Connector

Pin-Out

........•....•..........

Joystick

Schematic...............................

Antenna

Switch

Box

Schematic

.....................

Normal

Power

Supply.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Defective

Power

Supply

...........................

High

Frequency

Component

+5V

Source

...........

and

Clocks.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

VDG

Clock

and

Modulator

Clock

....................

and

Phase

B...

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Phase

Band

Phase

Relationships,

Green

Screen

Phase

Band

Phase

Relationships,

Blue

Screen

...

Phase

Band

Phase

Relationships,

Red

Screen

....

Artifacting

Signals..............................

Artifacting

Signals..............................

Artifacting

Signals..............................

Address

Lines

(Typical)

..........................

Data

Lines

(Typical)

.............................

----------

ltadtelhaell----------

iii

Color

Computer

Service

Manual

-----------TRS-80

-----------

LIST

FIGURES

(con't)

Fig.

Description

Page

No.

5-15

5-16

5-17

5-18

RAS*

and

CAS*

...................................

Data

and

Data

OUT

........••••.................

Sound

and

Cassette

Output

.......................

Cassette

Zero

Crossing

Detector

.................

6-1

Color

Computer

Exploded

View

...................

LIST

TABLES

Line

Printer

variables

...................•.......

Alternate

Line

Printer

Variable

Values

.......•...

Cartridge

Connector

Signals......................

--------------------ladtelhaell-------------------

Color

Computer

-----------TRS-BO

General

1.1

Introduction

Service

Manual

The

Color

Computer

refined

version

Radio

Shack's

popular

Color

Computer.

designed

provide

the

same

reliable

operation

its

predecessor,

but

incorporates

the

latest

electronic

technology.

Interconnection

video

monitor,

printout

device,

modem

provides

maximum

versatility

the

Color

Computer

Figure

1-1

shows

typical

installation

the

Color

Computer

Interconnecting

cables

are

noted

which

provide

signal

and

control

transfer

between

the

major

components.

Always

remember

remove

all

power

from

the

Color

Computer

prior

installing

any

peripheral

device

prevent

damage

the

device

the

Color

Computer

The

Color

Computer

contains

internal

BASIC

program

ROM

which

accessed

when

the

unit

powered

up.

Other

program

modules/cartridges

may

inserted

into

the

receptacle

the

right

side

the

unit.

optional

Multipak

Interface

module

allows

four

program

paks

installed

the

same

time

with

selection

the

specific

module

active

any

one

time

selected

either

software

switch

the

Multipak

Interface

module.

Additional

peripheral

devices,

such

external

disk

drive,

may

added

the

Color

Computer

for

additional

memory

storage

and

retrieval.

All

inputs

outputs

from

the

Color

Computer

with

the

exception

the

program

module/cartridges,

are

contained

the

rear

panel

the

unit.

These

include

the

joystick

inputs

(right

and

left),

Serial

I/O,

Cass

I/O,

output

connector,

Power

ON/OFF

switch,

and

RESET

switch.

recessed

channel

switch

(for

selecting

either

channel

the

TV)

also

located

the

rear

panel

the

unit.

1.2

System

Description

The

primary

functions

the

Color

Computer

are

performed

five

40-pin

Large

Scale

Integration

(LSI)

chips

plus

Random

Access

Memory

CRAM)

and

Read

Only

Memory

CROM).

These

five

chips

are

labeled

the

Block

Diagram

CPU,

SAM,

VDG,

and

two

PIAs.

With

only

these

five

chips

plus

RAM,

ROM,

and

power

supply,

the

Color

Computer

will

operate

and

provide

composite

video

output.

However,

allow

communication

with

the

outside

world,

I/O

interfaces

must

added.

-----------

ltadtelhaeli----------

- 1 -

Color

ornputer

COLOR

MONITOR

LEFT JOYSTICK

Figure

1-1.

TRS-BO

anual

--------~S~e=r~v~i:c:e_~~~~~

RIGHT JOYSTICK

Color

ornputer

Installat'

ion

ltad1elhaell

----

- 2 -

_o_

r_ c_o_m_p_u_t_e_r_ 2

____

TRS

Service

Manual

The

main

component

any

computer

system

the

Central

Processor

Unit

(CPU,

U23).

the

function

the

CPU

provide

request

data

and

select

the

proper

address

for

this

data.

addition,

the

CPU

capable

performing

limited

set

mathematical

and

logical

operations

the

data

ROM

(Ul2

Ul3

Extended

Basic)

has

the

function

providing

the

CPU

with

pre-defined

set

instructions.

Without

ROM,

the

CPU

would

run

wild

and

randomly

execute

instructions.

normal

operation,

the

CPU

jumps

the

start

address

ROM

after

the

reset

switch

has

been

pressed

and

then

performs

the

reset

program

set

all

the

progr

mmable

devices.

Following

this,

the

BASIC

interpreter

residing

ROM

control

the

CPU.

RAM

(Ul4

thru

U21)

provides

storage

for

the

programs

and/or

data

currently

being

executed.

the

standard

unit,

these

eight

res

are

16K

x 1 (MCM4517)

but

may

upgraded

64K x

res

(MC6665)

option

(see

Paragraph

3.3

for

instructions).

addition,

this

same

RAM

used

generate

the

video

display.

Normally,

conflict

will

observed

because

the

program

wil

use

one

portion

RAM

and

the

display

will

use

another.

Duri

normal

usage,

the

BASIC

interpreter

located

ROM

will

cont

rol

the

execution

programs

located

RAM.

central

component

the

Color

Computer

the

Synchronous

Address

Multiplexer

(SAM,

U22).

This

chip

provides

refresh

and

address

multiplexing

for

the

RAM.

also

provides

all

the

system

timing

and

device

selection.

The

video

display

generator

(VDG, U8)

provides

virtually

the

entire

video

interface

one

chip

and

allows

several

alphanumeric

and

graphic

modes.

The

mode

operation

the

VDG

controlled

one

two

Peripheral

Interface

Adapters

(PIAs,

and

U7)

used

the

Colo

Computer

With

this

information

and

RAM

data

the

VDG

generates

composite

video

and

color

information

for

the

modulator

circuitry.

----------1tad1elhae

---------

- 3 -

'"Zj

.....

'°

t'1

t-'

(')

.....

t'1

&a.

(')

I 9

I c

rt"

(1)

t'1

...

@ N

t-'

()

;io\"'

.....

'°

t'1

POWER

SUPPLY

•5V

U23

CPU

MC6809E

CONT

SIGN

AOL

ALS

BUF

FER -

74LS

244

'------

,____

•

' r

CARTRIDGE

CONNECTOR

DATA

OUT

LATCH

DISPLAY

DATA

74LS

273

DYNAMIC

RAM

MCM4517

U14

-21

(64K

MC6665

DEVICE

U22

1---

SELECl

SAM

DYNAMIC

-U10

RAM

CONTROLLER

74LS02

74LS138

MC6883

DATA

ADDRESS

' t

U12

(U13}

16K

x 8

ROM

MC68A364

SOUND

MODULATOR

MC1372

VIDEO

r------ --------

SOUND

VOG

GENERATOR

MC6847

I I

•

I r

-t

~£~~l!f~

PIA

r=+

==.i

MC6821

INTERFACE

i-.-

I l

.___

.._

232

INTERFACE

f-4--

"'----

-----------

j l

PIA

JOYSTICK

MC6822

INT

ERFACE

T i i

KEYBOAR

oRcoiii'TiloL:

----------

JOYSTICKS

(')

t-'

t'1

(')

rt"

(1)

t'1

(/)

(1)

t'1

.....

()

(1)

:s::

::J

t-'

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