Vector Graphic Extended Systems Monitor Manual de usuario descargar pdf (Pagina 15)

Extended Systems Monitor

User'

s Manual

mTRY POINTS

A jump

table

at

the

beginni

n:!

of

the

Moni

tor

can

be used

to

access

several

routines:

EOOO

- The nonnal

cold

entry

point

to

the

Monitor

Executive,

this

is

a jump

to

the

initialization

routine

which

clears

the

screen

and

initializes

8251

USARTS

through

I/O

ports

3,

5,

and

7.

This

is

compatible

with

the

Bitstreamter

I

addressed

startin:!

at

port

4

or

the

Bistrearner

II

addressed

starting

at

port

2. The

USARTS

are

set

for

an

X16

baud

rate

factor

and

other

parameters

as

would be used

with

a

serial

printer

or

extra

terminal.

E003

-

This

is

a jump

to

the

routine

which

should

be

used

for

console

keyboard

status

test.

Return

with

the

zero

flag

set

indicates

no

keyboard

input.

E006

-

This

is

a

jump

to

the

keyboard

data

input

which

returns

with

the

character

in

the

"A"

register.

The

keyboard

code

conversions

described

below

are

carried

out.

There

is

no

checking

for

ESC

key

depression.

E009

-

This

is

a

jump

to

the

video

driver

which

displays

the

character

in

"A"

on

the

screen.

E00C

-

This

is

a jump

to

the

"ESCAPE"

routine

which

returns

zero

if

no

input,

or

with

the

character

in

the

"A"

register

if

there

is.

Keyboard code

conversions

are

carried

out.

If

the

ESC

key

was

pressed,

the

system

returns

to

the

Monitor

Executive.

Rev..

4.1.3-1\

10/15/19

9

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