Atari 800 Manuel de l'opérateur télécharger pdf (Page 25)

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USING

THE

EDITOR

t

I

I

I

t

I

COMMANDS

EDIT A

PROGRAM

Now

that we havc

explanrcd

how to

gct

started writire

a

proeram.

rt is

uD ro

you

to

actually $'ritc

the

program.

This manual

coniiins-r

eiy liiitc

jni;r

mdijon

on assem}]y

.laDguage

pfogramDring

rectrniques. wc

assume

thar you are

alrcrLly

fdmilirr

wilh

Jssenrbty

language.

ihe remainder

of

the section

, i F s . . i L r p s l r n $

r o r b "

r h c

A . s c m L r t ^ .

r d i r , , r , n , r r i d g r

a u

n commano

rs nor

rhe same

fhine as

an instruction.

An insiructioir

has

a line

numbe.;

a command

has no

line number.and

is

executed immediatety.

NDw

Command

This

command

clears the

edii text

bul]br. After

this command

restore your

source program;

it has

been d€stroyed.

Somc programmers

ha1,e

th€ habit

ot

giving

the NEw

coDrmand

(or

its

e.luivaleDt with

olher

asscmblers) whcn

thev start

a

programming

sessioD. r.he

r€ason

is to remove

any

.,garbage,,

ihal may

be in mernory

by misrake.

SiDce

thc.ATARI Pcrsonnl

Compuier Sysiem

clears

jts

mcmory rvtren

it is turned

or,,

such

rouiine use

olNDw wouldbe

a needlcss precaution.

Because

NEw destroys

your

cniire sorrcc progranr!

it is more

importanr

io dcvetop

a

trabii

of NO,l.

usxrg ii roulinely.

You

should. .atherJ

use NEw

in a very

dctiberate fashion

only

rvhen you

rv:Dt to rcmove

a source prog.am

from RAtvr.

DEL

Command

This

command

deletes

statements

from your

souce progfam.

Drlxx

S.qe*

deletes staiement

nnmber

xx.

DEIxx,n'

$itR:*

dcleies statement

numbers

xx

trrrcugh yy.

NUM

Command

This

command

assign$

staiement

numbers

auiomatical|y.

NUM

liflnir&

incremcnts

statemeni

number

by 10

a{ier

cach

4FilH.

rhe nerv

statement

numbcr,

fbllowed

by a space,

is auto

matically

displayed.

l'i1Xi+l}

has the

same eilact

as NUM,

but ihe

ncrement

is nn instead

of10.

llltl:i't

forces the

next statement

nuDber

io be

mm and

the indement

to be nn.

fiitjtlj

cancels the NUM

command.

NUMnn

NUMmm,nn

i;'r,:SS

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