Vector Graphic Extended Systems Monitor Manual de usuario descargar pdf (Pagina 13)

Extended

Systems

Monitor

User1s

Manual

*T

<AmI>

<ADR2>

- TEST

MFnJRY

This

is

an

extremely

useful

command,

especially

when

first

setting

up a

system.

This

command

permits

thorough

testing

of

the

system

memory. A

portion

of

a

64K

byte

pseudorandom

number

sequence

is

written

into

memory

fran

ADRl

through

ADR2,

and

the

exact

same

sequence

is

regenerated

from

the

ini

tial

point

and compared

with

what

is

read

from memory.

If

all

locations

compare,

another

portion

of

the

sequence

is

used

to

repeat

the

test

which

continues

until

it

is

interrupted.

Any

memory

errors

are

displayed

with

the

address,

what

was

written

into

memory and

what

was

read

from

memory,

respectively.

This

information

is

all

that

is

needed

to

pinpoint

a

malfunctioning

memory

chip.

'Ibis

test

is

qui

te

exhaustive

if

used

for

at

least

10

cycles

and

is

far

superior

to

incrementing

or

complementing

tests

which

may

not

reveal

addressing

problems.

The

only

area

of

system

memory

that

cannot

be

tested

with

this

routine

is

the

few

bytes

required

for

the

stack

and

video

flags

in

the

vicinity

of

FFD0

on

the

2708

PROM/RAM

board.

*U - JUMP TO

2888

This

command

permits

easy

return

to

programs

in

the

user

application

area

of

MDOS.

*W

<AmI>

<ADR2>

-

WIDE

ASCII

OOMP

This

is

similar

to

the

"A"

command,

but

with

a

full

screen

width

display.

*X

<AmI>

<ADR2>

<ALR3>

-

EXa:.I.Ml3E

MEMJRY

BLOCKS

A

block

of

memory from

ADRl

through

ADR2

is

exchanged

with

an

equal

length

block

starting

at

ADR3.

This

command

is

useful

in

comparing

the

operation

of

two

versions

of

a

program,

or

for

rapid

switching

of

portions

of

a

program

without

destroying

the

original.

A

loaded

BASIC

program

can

be

exchanged

with

another

if

care

is

used

to

include

the

stack

area

(usually

below

the

top

of

allowed

memory)

•

*y

- KEYBOARD ECHO

This

command

causes

keyboard

input

to

be echoed

directly

to

the

video

driver

and

can

be

used

for

demonstration

purposes.

An

ESCape

returns

to

the

Moni

tor.

Rev.

4.0-A

10/15/79

7

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