Atari 800 Manuel de l'opérateur télécharger pdf (Page 50)

Because

the disassembler starts disassembling from

the first address

you

specify, you

have to take care that the frst address contains

the fir6t ble ofa

"real"

instruction,

A Assemble

One Instruction Into Memory

The

DEBUGGER has a mini-dssembler,

that can ass€mble one ass€mbly language

ifftruction

at a time. To enter th€ Assemble mode.

tvDe:

A @

Once in

the

Ass€mble

mode,

you

stay there until

you

wish

retlfn

DIBUGGI& which you

may do by

pressing

(on

an empty tine].

To assembl€

a]rl

instruciion,

first enter the address at which

you

wish to have

the Irrachin€ code inseried. The

number that vou enter will be interDreted as a

hex address. Now t}?e

'folJowed

by at

leair

one space. rhen the insrruction.

You may

omit an addr€ss ifassembly is to be in successive locations.

Example:

EDIT

suc

DEBUG

831@

5001<LDY

$1234

5001 AC3472

<nwl@

5004 cB

| ] @

Computer Responds.

Computer

Responds.

DEBUG

t l

Since the

miDi-ass€mbler assembles only one instruction

at a time, it cannot

refer to anorher instrucrion.

Therefore, ir cannot interpret

a label. Conse-

quenrly.

labels are nor

legal in lhe mini-assembler.

You can use the

directives BYTE, DBYTE, and WORD.

Gmmmm Go

(Ex€cule

ProgFan,

This cominand

€x€cutes instructions starting

at mmmm. For exampte;

GTBOO

Executes instructions starting at location 7800.

Execution

continues indefnitely. Execution is

stopped

pfessing

the

key

(unless

the

pre

gran

7800

tricks or crashe8 the operating system).

Tmmmn Tlace

Operatlon

This command

has th€ same e{Ieci

as cirunmm. exceDt that aft€r execution

each insrru(Iion

the sffeen shows the instrucrion

adidress, rhe inslrucrion in

machine code, the irNtruction

in assembly language

(disassembled

by the

debugg€r-not necessarily

the sane as

you

rffote it in ass€mbly

language) and

the

values

ofRegisrers A, X. Y.

P and S.

The

execution stops at a BRK

instruction

(machine

code 00) or when you press

the

key on the keyboard.

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 91 92

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Atari 800 Manuel de l'opérateur Page 50

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