Texas Instruments

990

Texas Instruments 990 Installation And Operation

Texas Instruments 990

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945423-9701

SECTION IV

OPERATION

4.1

GENERAL

This

section

provides

detailed

information

about

the

controls

and

indicators

available

to

the

ter-

minal

operator.

The

section

also

contains

preventive

maintenance

procedures

to

be

followed

by

the

terminal

operator.

NOTE

The

Model 911

Video

Display

Terminal

cannot

be

operated

unless

properly

connected

to

a Model

990

family

computer

with

the

applicable

software

loaded.

The

function

of

each

key

on

the

keyboard

depends

on

the

controlling

input/output

program

resident

in

the

computer.

Therefore,

before

using

the

Model 911

Video

Display

TerminaL

t1h~

operator

must

know

the

programmed

function

of

each

key

on

the

keyboard

to

ensure

that

the

data

entered

into

the

system

is

correctly

interpreted

by

the

software.

In

addition

to

the

keyboard

controls,

controls

and

indicators

appear

on

the

display

unit

to

optimize

the

video

and

audio

presentation.

An

indicator

also

appears

on

the

VDT

controller

board

for

maintenance

purposes.

4.2 KEYBOARD

The

standard

keyboard

consists

of

88

keys

grouped

as

shown

in figure 4-1.

The

key

codes

C;1l1 he

interpreted

by

software

to

perform

various

functions.

The

standard

keyboard

layout

illustrated

It1

the

figure is

organized

into

five

types

of

keys:

•

Data

entry

keys

•

Cursor

control

and

edit

keys

•

Numeric

keys

•

Mode

keys

•

Repeat

key.

The

keyboard

data

keys

produce

an

eight-bit

code

(sec

table

3-5

for

United

States

keyhoard

code..;.

and

appendixes

for

international

keyboard

codes).

The

mode

keys

detennine

which

eight-bit

co(k

will be

produced

hy

each

data

key.

The

United

States

and

European

versions have

three

mode

keys

(SHIFT.

CONTROL,

and

UPPER

CASE

LOCK)

to

select

one

of

four

codes

for

each

dau

k:'y.

The

Japanese

Katak:ll1a

keyboard

has five

mode

keys

to

select

one

of

six

codes

for

variou'.

Jata

keys.

The

mode

keys

alone

do

not

cause an

eight-bit

code

to

be

produced

hy

thl'

keybuard.

(Refn

t(l

tables

4-]

and

4-:2

for

keyboard

mode

selection.)

4-1

Digital

Systems

DIVISion

Table of Contents

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Manual211 pages

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Texas Instruments 990 Specifications

General

Brand	Texas Instruments
Model	990
Category	Desktop
Language	English

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