DEC VT220 - Page 150

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While

metronome

codes

are

key,

a

nonautorepeating

transmitted.

The

keyboard

the

next

metronome

code,

code.

The

keycode

to

be

transmitted.

being

generated

for

an

autorepeating

keycode

or

special

code

may

be

transmits

this

special

code

instead

of

and

then

returns

to

the

autorepeated

autorepeated

is

always

the

last

byte

Example

2

The

a

key

is

held

down.

This

produces

the

following

transmission.

a

metronome

metronome

Now

the

SHIFT

key

is

pressed.

This

produces

the

following

transmission.

a

metronome

metronome

shift

a

metronome

Now

the

SHIFT

key

is

released.

This

produces

the

following

transmission.

a

metronome

metronome

shift

a

metronome

ALL

UPS

a

metronome.

• •

•

If

an

autorepeating

key

is

not

to

autorepeat

(CTRL C

for

example),

the

system

module

must

issue

a

temporary

inhibit

autorepeat

command.

This

halts

the

transmission

of

any

metronome

codes

or

keyclicks

for

that

key

only.

Metronome

codes

continue

when

another

key

is

pressed.

The

command

must

be

issued

after

the

keycode

for

the

autorepeating

key

is

received.

Autorepeat

can

be

enabled

and

disabled

independently

of

the

division

settings

by

using

the

enable/disable

autorepeat

commands.

These

commands

apply

to

all

keys

on

the

keyboard.

When

autorepeat

is

disabled,

internally

the

keyboard

continues

to

autorepeat

characters.

However,

it

does

not

transmit

metronome

codes

or

keyclicks.

When

autorepeat

is

enabled,

the

keyboard

transmits

the

metronome

codes

from

the

point

they

were

before

autorepeat

was

disabled.

This

may

be

within

either

the

timeout

or

interval

period,

depending

upon

the

time

elapsed

since

the

key

was

pressed.

•

If

the

keyboard

receives

a

request

to

change

a

division

mode

to

autorepeat

while

a

key

is

pressed,

the

keyboard

makes

the

change

immediately.

After

the

specified

timeout

period,

the

keyboard

transmits

metronome

codes

for

the

pressed

key.

In

place

of

the

first

metronome

code,

the

keyboard

transmits

the

keycode

of

the

autorepeating

key.

All

autorepeating

division

modes

can

be

changed

to

only

down

with

one

command.

This

and

other

4utorepeat

commands

are

grouped

with

the

peripheral

commands

(refer

to

section

6.5.5.3).

7-24

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