Vector Graphic Extended Systems Monitor Bedienungsanleitung PDF herunterladen (Seite 10)

Extended

Systems

Monitor

User'

s Manual

*F

<ADRl>

<ADR2>

<BY'TEl>

<BYTE2>

-

FIND

'J.'W)

B~

This

memory

range from

ADRI

through

ADR2

will

be

searched

for

the

particular

code

combination

BYTE

I

BYTE

2.

This

is

useful

for

locating

particular

commands

or

jump

addresses.

For example,

if

you wish

to

change a

control

character

(say

control

D)

in

a program you

may

try

FE

04,

which

is

CPI

04

since

this

is

a

common

way

of

testing

input

characters.

If

you wish

to

find

all

locations

that

call

or

jump

to

a

particular

address,

say

C700,

then

search

for

00C7.

There

is

no

guarantee

that

each

location

displayed

is

valid

object

code -

it

may

be

part

of

a

data

table,

ASCII

string,

or

second

and

third

bytes

of

a

three

byte

instruction.

*G

<ADRl>

-

GO

TO

AND

EXECUTE

This

command

will

cause

a jump

to

ADRI

to

execute

a

program

or

user

subroutine.

As

wi

th

all

Moni

tor

jump

commands,

the

address

contained

on

the

stack

is

"START"

(C00B) and

if

the

user

routine

at

ADRI

ends

in

"RET",

program

execution

will

return

to

the

Monitor.

Vi

rtually

unUmi

ted

stack

space

is

available

(up

to

lK),

but

of

course,

pushing

more

registers

on

the

stack

than

are

popped

will

defeat

the

return

feature

with

undesirable

effects.

*8

-

JUMP

TO

HI

RAM

This

command jumps

to

FC00

which

is

the

start

of

the

lK

scratchpad

RAM.

This

is

a

useful

area

for

small

machine language programs.

*1

<PORr>

- INIUr

FROM

A

PORI"

Execution

of

this

command

will

cause

the

CPU

to

execute

an

"IN

PORT"

instruction

and

the

accumulator

contents

immediately

following

this

to·

be

displayed.

This

command

is

useful

in

checking

out

peripheral

equipment.

Only

those

ports

used

by

the

terminal,

cassette

interface,

etc.,

will

contain

interesting

values.

All

others

will

read

FF

since

the

data

bus

will

be

floating

when

the

"IN"

comITland

is

executed.

*J

- JUMP TO

LOADED

.IJai

This

command

permits

easy

return

to

the

MOOS

disk

operating

system

at

0437H,

or

if

not

present,

jump

will

be 0437H, which

is

the

MOOS

entry

location

and

is

subject

to

change

in

future

releases.

4

Rev.

4.0-A

10/15/19

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