BEEHIVE SUPER BEE - Page 45

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Table 2-3.

Operation

Codes (Continued)

CODE OPERATION

ESC-CONTRO L [

ESC-b

(Keyboard

Enable)

ESC-c

(Keyboard

Disable)

ESC-[

(End Protect)

ESC-]

(Start

Protect)

ESC-e

( EOS Delete)

ESC-

( underscore)

This

is

the

initial

code

in an escape sequence

control

function.

This

two

code

sequence

from

the

1/0 enables

the

keyboard.

This

two

character

code

sequence disables

the

Keyboard

from

generating

any characters

or

control

functions

except

the

RESET

function.

The

key-

board

may

subsequently

be enabled normally

by

the

RESET key

or

from

the

1/0 by

an

ESC

and

b.

When

this

two-code

sequence

is

recognized

from

the

Keyboard

or

1/0, it

resets

the

protect

latch

and

inserts an 0

in

the

eight bit position

of

each

character

stored

in

the

memory

after

the

reset. In

Format

mode,

the

0

in

the

eighth bit indicates an

unprotected

character

location

in

the

mem-

ory. In

the

Program

Entry

mode,

the

characters in

the

unprotected

loca-

tions are displayed as reverse video characters.

When

this

two-code sequence

is

recognized

from

the

Keyboard

or

1/0, it

sets

the

protect

latch and a 1

is

inserted

in

the

eighth bit position

of

each

character

stored

in

the

memory

after

it

is

set. In

the

format

mode,

the

1

in

the

eighth bit indicates a

protected

character

location

in

the

memory.

When

this

two-code

sequence

is

recognized

from

the

Keyboard

or

1/0,

. all

the

characters

in

the

memory

from

the

cursor's

location

to

the

end

of

memory

are replaced with delete codes

in

a Character mode. In

the

For-

mat

mode

all

the

unprotected

characters in

the

memory

from

the

cursor's

location

to

the

end

of

memory

are replaced with delete codes.

In

the

Program

Entry

mode,

the

code

e

is

displayed in reverse video

and

the

function

is

not

performed.

When

this

two-character

code

sequence

is

recognized from

the

Keyboard

or

1/0,

the

terminal

is

ready

to

receive

one

of

the

following video

control

characters:

space - video reset

0 - video blink

1 - video reverse

2 - video blink reverse

3 - video line reset

In

the

Character

mode

or

Format

mode, all special video functions are ter-

minated

by

the

end-of-line

or

a new line

code

and

its special symbol

is

displayed.

In

the

Program

Entry

mode,

the

function

is

not

performed.

2-20

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