Tandy TRS-80 Model II Manual de usuario

CUSTOM MANUFACTURED

U.S.A. BV RADIO SHACK, ADIVISION OF TANDV CORPORATION

-----------

TRS-aO

-----------

TRS-80~

Multiterminal

Interface

Service

Manual

1983

Tandy

Corporation

AlI

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.

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Multiterminal

Interface

~~~.~~

~~~~~_S_e_r_v_i_c_e~M_a_n_u_a~l~

TABLE

CONTENTS

Sec

Description

Page

Gener

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Installation.

................................... 3

2.1

Software

Requirements......................

2.2

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

2.3

Setting

Multiple

TerminaIs..............

2.4

Connecting

Terminal

The

Computer......

2.5

Checking

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

2.6

Enabling

Terminal........................

2.7

Disabling

Terminal

2.8

Model

Conversions

Theory

Operation.............................

3.1

USART

Circuitry

3.2

Baud

Rate

Generator

3.3

RS-232c

Interface

..•.......................

3.4

Loopback

Circuit

..................•........

3.5

Processor

Interface........................

Schematic

8000198

Component

Layout

.......•...•..............•

Circuit

Trace,

Component

Side

Circuit

Trace,

Solder

Side

Parts

List.................................

Troubleshooting

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TRS-SO

S_e_r_v_i_c_e_M_a_n_u_a_l

LIST

FIGURES

No.

Description

2-1

Multiterminal

Interface

Board

Page

No.

Installation.

••••••••••••.••••••••••••••••• 4

2-2

DIP

Switch

Settings............................

2-3

Typical

System

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

LIST

TABLES

3-1

Programming

Parameters

(Page

4 ) . . . . . . • . . . .

Programming

Parameters

(Page

4 ) . . • . . . . . . . .

Progralnming

Parameters

(Page

4 ) . . . . . • . . . . .

Programming

Parameters

(Page

4 ) . . • • . . • • . . .

3-2

Baud

Rate

Gener

tor

••••••••••••••••••••••••••••

----------lIadI8

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M_u_l_t_1_

t_e_rl!Wlllm_i_n_a_l_I_n_t_e_r_f_a_c_e_

TRS-SO

General

Service

Manual

The

Multiterminal

Interface

Board

(26-6013)

al10ws

the

Model

16/16B

interface

with

three

additional

terminaIs.

This

capability,

combined

with

the

XENIX

multitasking

capability,

allows

six

independent

operators

have

access

the

features

contained

single

Model

16/16B.

This

results

cost

savings

per

terminal

and

the

added

advantage

shared

data

base.

The

Multiterminal

Interface

Board

basically

three-port

RS-232C

seriaI

interface

the

a-bit

Z80A

Model

16/16B

Peripheral

Processor.

The

normal

mode

operation

defined

software

full

duplex,

asynchronous

transmission

with

baud

rate

range

from

9600.

The

computer

interface

interrupt

driven.

the

reception

transmission

any

character,

interrupt

created

and

the

character

stored

retrieved

from

memory

buffer.

The

Multiterminai

Interface

Board

mounted

the

Card

Cage

assembly

which

internaI

the

Computer.

Since

the

Multiterminal

Interface

Board

must

the

interrupt

chain,

its

priority

position

the

card

cage

must

noted

the

chart

below

preserve

this

daisy-chaining

action.

one

the

boards

listed

the

first

three

positions

not

present,

then

the

other

boards

move

slot.

board

position

not

critical,

i.e.

not

part

the

interrupt

cycle,

its

priority

position

noted

"None".

Physical

positioning

the

board

the

card

cage

the

Model

16B

from

the

bottom

(JI)

the

top

(J7)

•

Priority

Pos.

Description

ARCNET

Hard

Disk

Interface

Multiterminal

Interface

Graphics

Video/Keyboard

Interface

256K

Memory

Board

256K

Memory

Board

256K

Memory

Board

Bit

CPU

Board

priority

None

----------lIadlo/haelÏ

---------

- l -

Multiterminal

Interface

TRS-SO

S_e_r_v_i_c_e_M_a_n_u_a_l_

----------lIadlelllaell----------

- 2 -

M_u_I_t_i_t_e_r_m_1_'

n_a_I_I_n_t_e_r_f_a_c_e_

TRS-SO

~-'

Installation

Service

Manual

Included

the

following

pages

are

instructions

for

installing

and

interconnecting

the

Multiterminal

Interface

PCB

the

Model

Radio

Shack

Computer.

This

option

allows

you

interconnect

many

five

additiona1

terminaIs

the

computer

that

acommon

data

base

may

used

aIl

terminaIs.

Refer

the

TRS-XENIX

Operator's

Manual

for

operating

instructions

for

the

system.

2.1.

Software

Requirements

The

only

current

operating

system

offered

Radio

Shack

which

supports

this

board

TRS-XENIX,

Version

01.03.00

higher.

You

must

upgrade

your

system

least

version

01.03.00.

you

already

have

the

XENIX

Operating

System,

necessary

modify

using

software

update

diskette

(Catalog

No.

700-2066)

which

modifies

1.1

1.2

system

version

01.03.00

System.

you

not

have

the

XENIX

Operating

System,

will

necessary

purchase

the

XENIX

Version

01.03.00

Core

System

(Gatalog

No.

700-2052).

2.2.

Installation

The

following

instructions

are

given

allow

proper

installation

the

Mu1titerminal

Interface

Board,

check

out

its

function

ensure

proper

operation,

and

perform

modifications

required

the

Main

Terminal

al10w

communication

between

and

the

remote

termina1(s).

The

Multiterminal

Interface

Board

installed

Model

16B

the

card

cage

assemb1y.

accessible

when

the

rear

cover

removed

from

the

Model

16B

Case

Assemb1y,

the

top

cover

from

the

Model

16.

----------IIMIOIhaeIl----------

- 3 -

M_u_l_t_1_

t_e_r_m_1_

n_a_l

I_n_t_e_r_f_a_c_e_

TRS-SO

Service

Manual

Rear View

::>

-e

::>

ca ca

ëe

uE0E

-e

0~0~

'"C

ni ::I: U

Multiterminal

°ê

Interface ë

Board

Li:

Model16

Rear

View

68000

CPU

16-Bit Memory

Option

Video Board

Multiterminal Interface

Hard Disk

Upgraded Model 12

Figure

2-1.

Multiterminal

Interface

Board

Installation

----------lIadlo

IlIaelÏ----------

- 4 -

Multiterrninal

Interface

~~~.~~

~~~~~_s_e_r_v_i_c_e~M_a_n_u_a_l~_

Rear

Cover

Removal

Model

Turn

the

computer

that

the

rear

facing

you

allow

access

the

top

cover.

Remove

the

top

cover

unscrewing

the

two

mounting

screws.

Lift

and

the

rear

the

top

cover

gain

access.

Insert

Multiterminal

Interface

PCB

noted

Figure

2-1.

Model

16B

Turn

the

computer

that

the

rear

facing

you

allow

access

the

rear

cover.

Remove

the

two

mounting

screws

the

10wer

part

the

rear

cover.

Lift

out

the

bot

tom

the

cover

plate

and

pull

down.

Remove

the

card

holding

brackets

from

either

side

the

card

cage

allow

the

Multiterminal

Interface

board

installed.

Attach

the

cable

end(s)

the

connector(s)

the

Multiterminal

Interface

Board.

The

DIP

switch

must

set

for

the

proper

operation

noted

Figure

2-2.

Slide

the

board

into

the

connector

slot

shown

Figure

2-1.

The

Multiterminal

Interface

board

must

the

interrupt

chain.

Therefore,

there

must

empty

slots

between

the

board

and

JI.

The

Multiterminal

Interface

board

must

other

boards

are

present.

J2 J3

Jumpers must

in place

OFF

E7-E8

El0-E11

DIP Switch

InllJ

Inl

E13-E14

S1-0N

S2-Sa -

OFF

Figure

2-2.

DIP

Switch

Settings

----------lIadI8

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- 5 -

Multiterminal

Interface

TRS-SC

Service

Manual

Loosen

the

screws

which

mount

the

Strain

Relief

Bracket

the

Rear

Door.

Feed

the

cable(s)

from

the

remote

unit(s)

between

the

Strain

Relief

Bracket

and

the

Rear

Door

and

tighten

the

screws

mounting

the

Bracket.

Allow

enough

cable

the

inside

the

bracket

provide

internaI

loop.

2.3.

Setting

Multiple

TerminaIs

The

Xenix

system

programmed

accommodate

wide

range

terminal

types

but

the

system

has

know

what

kind

terminaIs

are

connected

that

can

calibrate

itself

the

terminal's

particular

characteristics

and

capabilities.

The

console

automatically

set

accommodate

two

DT-I

terminaIs.

TRS-XENIX

calls

them

the

"Adds25"

terminal

type,

and

expects

the

terminaIs

you

connect

set

the

DT-I's

Adds25

emulation

mode.

That

information

stored

aTRS-XENIX

file

called

/etc/ttytype.

you're

connecting

DT-l

the

console,

just

connection

instructions

and

proceed

directly

enabling

your

terminal

(see

paragraph

2.6).

If,

however,

you're

connecting

terminal

other

than

DT-l,

you

have

let

TRS-XENIX

know.

file

called

/etc/terrncap

stores

the

characteristics

aIl

commonly

used

terminaIs.

The

following

list

gives

the

names

and

codes

for

the

terminaIs

pre-configured

/etc/termcap:

NAME

100

ADM

Televideo

910

ADDS

CODE

vt100

vt52

adm3a

adm5

tvi910

adds25

let

TRS-XENIX

know

what

kind

terminal

you'll

using,

edit

the

/etc/ttytype

file

include

one

the

above

names.

that

point,

TRS-XENIX

can

work

with

your

terminal

just

soon

you've

enabled

it.

---------lIadlelhaell---------

- 6 -

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