Vector Graphic Extended Systems Monitor Manual de usuario descargar pdf (Pagina 16)

Extended Sy;sterns

Monitor

User's

Manual

VIDEO

DRIVER

Version

4

of

the

Monitor

contains

a more

elaborate

video

driver

than

previous

versions.

The

purpose

of

the

video

driver

is

to

accept

a

stream

of

ASCII

codes,

and

to

write

them

into

the

screen

memory

in

the

proper

place,

interpreting

certain

non

printing

control

codes

in

a

special

way. There

are

several

entry

points

to

the

video

driver.

E009

is

recommended. The

character

code

to

be

printed

must be

in

the

A

register.

A

CALL

E009

will

cause

the

character

to

be

printed

on

the

screen

at

the

cursor

position.

All

registers

will

be

preserved.

Control

codes

are

generated

by

the

keyboard by

holding

the

control

(CTRL)

key

down

while

a

letter

key

is

pressed.

Control

codes have

values

between 0

and

31,

and

are

64

less

than

the

codes

for

the

corresponding

upper

case

letters.

To

demonstrate

the

features

of

the

video

driver,

type

Y

after

the

Monitor

prompt, and any keyboard

generated

code

will

be

echoed

to

the

video

driver.

The

following

control

codes

are

interpreted

as

special

functions,

while

all

others

are

ignored:

(B)

HOVlE

THE

CURSOR

(D)

CLEAR

THE

SCREEN

AND

HOME

CURSOR

(E)

DISPLAY

THE

CODE

IN

B

REGISTER

(H)

DESTRUCTIVE

BACKSPACE

(also

BACKSPACE

key)

(I)

TAB

OVER

TO

THE

NEXT

8

MULTIPLE

(also

TAB)

(J)

LINEFEED

(also

LF

Key)

(M)

CARRIAGE

RETURN

(also

RETURN

key)

(N)

TOGGLE

CURSOR

(P)

CLEAR

TO

END

OF

SCREEN

(Q)

CLEAR

TO

END

OF

LINE

(R)

CURSOR

I.XWN

(also

t )

(T)

TOGGLE

REVERSE

VIDEO

(U)

CURSOR

UP

(also

+)

(W)

CURSOR

LEFT

(also

-+- )

(X)

CLEAR

TO

START

OF

LINE

(2)

CURSOR

RIGHT

(also

-+-)

ESC

CURSOR

XY

POSITION

LEAD-IN

Experiment

with

the

keys.

There

are

special

keys

on

the

keyboard

to

generate

some

of

the

codes such

as

RETURN,

TAB

and

linefeed

(LF).

If

you

are

using

the

Vector

Graphic Keyboard

or

Mindless

Terminal,

there

are

also

keys

for

the

cursor

control

and

BACKSPACE.

A few

of

the

functions

are

not

'self

explanatory.

A

Control

D

sets

the

reverse

video

flag

to

normal

in

addi

tion

to

clearing

the

screen

and homing

the

curso

r.

A

Control

Twill

then

toggle

the

reverse

video

flag

from normal

to

reverse

and back

without

printing

on

the

screen.

HI

Rev.

4.0-A

10/15/19

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