Vector Graphic Extended Systems Monitor Manual de usuario descargar pdf (Pagina 12)

Extended Systems Monitor

User'

s Manual

The

contents

of

16

bytes

of

memory

containing

ADRI

are

displayed

in

both

hex

and ASCII,

allowing

preceeding

and

following

instructions

to

be

viewed.

Advancing

to

the

next

instruction

is

accomplished by

typing

space

or

cursor

right

(+-).

Backspace

or

cursor

left

(...,.:..)

goes

backwards.

The

cursor

up

and down

keys

move

to

an

adjacent

16

byte

block..

Any

hex

characters

typed

will

replace

the

existing

contents

of

RAM.

After

every

keypress,

the

screen

display

is

refreshed

by

reading

from memory,

so

the

display

reflects

the

exact

memory

contents.

To

terminate,

depress

ESCAPE.

*Q <AOOIl>

<ADR2>

-

a>MPlJ'l"E

amc:xsuM;

The

MOD

256

checksum

of

memory

contents

in

the

address

range

specified

is

computed and

displayed.

This

command

is

useful

for

checking proms

or

files

to

see

if

anything

has

changed.

Any

source

file

or

program

written

in

pure

code

(it

does

not

write

on

itself)

will

have

the

same

checksum

as

when

it

was

loaded..

While debugging assembly language programs,

it

is

useful

to

be

able

to

verify

that

a program being debugged

has

not

written

garbage

in

the

source

file

or

assembler.

*R -

RffiISTER

LUMP

This

command

will

print

a

header

identifying

the

Z-80

registers,

and

immediately

below

it

the

contents

of

all

the

registers.

The

flags

are

displayed

with

the

letters

Z C M E H

for

the

zero,

carry,

minus,

parity

even, and

auxiliary

or

half

carry

flags

respectively.

The

presence

of

the

letter

indicates

the

flag

is

true.

The

contents

of

the

memory

locations

pointed

to

by

the

B,

D,

and H

register

pairs

are

also

displayed

as

is

the

return

address

on

the

stack.

*S

<ADRl>

<ADR2>

<BYTE>

-

SEARCH

FOR

S:m;LE

BYTE

This

is

similar

to

the

"F" command,

except

that

only

one

byte

is

searched

for

instead

of

two. An example

of

the

use

of

this

command

is

to

display

all

locations

in

a program where an

output

to

a

port

occurs

(D3).

The

address

of

each

location

will

be

displayed

followed by

"D3"

and

the

next

byte

(the

port

number).

6

Rev.

4.0-A

10/15/79

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 43 44

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