Vector Graphic Extended Systems Monitor Manual de usuario descargar pdf (Pagina 18)

Extended

Systems

Monitor

User

I s Manual

a.msoR X Y POSITlOODK3

Many

programs

utilize

random X Y

positioning

of

the

cursor.

This

is

done by

outputting

a

three

byte

sequence

to

the

video

drivere

The

first

code

is

ESC

(lBH)

followed

by

the

desired

X

position

and Y

position

in

hex.

The

top

left

corner

of

the

screen

is

0,

0.

The

sequence

IB

08

40

would

cause

the

cursor

to

move

to

line

8,

character

position

64 on

the

screen.

This

feature

can

not

be demonstrated using

the

keyboard

since

ESC

causes

a

return

to

the

monitor.

The

video

driver

provides

an

extensive

range

of

special

controls,

however,

they

must

be

incorporated

into

the

software

generating

the

video

stream

to

be

meaningful.

For

instance

a

piece

of

software

that

merely

echoes

all

characters

as

they

go

into

its

input

buffer

will

allow

cursor

motion on

the

screen,

but

this

will

probably

be

meaningless

to

the

software.

KEYBOARD

CODE

c:x:M1ERSlCE

-

VECTOR

GRAPHIC

KEYBOARDS

Due

to

limitations

in

the

keyboard

encoder

chip,

the

[]

key

on

Vector

Graphic keyboards

is

not

encoded

properly.

The

correct

code

is

generated

by

a

conversion

routine

in

the

Monitor!s

CONVERT

routine.

The

codes

for

backslash

and

tilde

are

also

produced by

the

control

and

control

shift

mode

of

this

key.

[]

KEY

CONVERSION:

MODE

KEYCODE

CONVERTED

CODE

ASCII

SYMBOL

unshifted

Fl

shifted

EI

control

Bl

control

shift

Al

5B

5D

5C

7E

[

]

\

The

cursor

up

key

is

also

converted

from

60H

to

ISH

which

is

interpreted

correctly

by

the

video

driver.

Room

is

provided

in

the

routine

for

up

to

15

keycode

conversions.

Foreign

languages

require

additional

conversions,

and

versions

are

available

for

French,

German,

Swedish

and

Spanish.

It

is

essential

that

software

utilize

the

monitor

conversion

routine

for

this

reason.

12

Rev.

4.~-A

1~/15/79

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 43 44

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