Atari 800 Manuel de l'opérateur télécharger pdf (Page 61)

APPENDIX

5

EXPRESSIONS

WheD

an insrrucrion

or

djrefljve

calls

fora

number

in the

op€rand,lhe

number

may

be

given

as

an

,,expafession.',

the n

*1i**r.'..

a'

"*i,"".;;;

i:"ffii;

i[T

"'

ffieraused

being

the varue

or the

Exprcssions

are rnade

up

ofoperators

and

Lerms.

Terms

are either

numbers

or

laDels

which

sfand

for

numbers.

An

expression

conLaining

a

f"Ua

,.rrn_,f,ri

cloe8

not

have

a nlrmeric

value

will

be

nagged

as

an

error.

There

are

five

operatorsj

four

are

arithmetiq

and

one

is logicat.

Addirion

is

signified

by rhe

6ign

subtraction

i6 signified

by

the

sjdn

Mrdriplicarion

is

sjqnified

bv

Division

is signifiea

by

"

,

Logicai

AND

i6 signified

by

ajr

Expre$ions

must

not

contain

parentheses.

Expressions

are

evaluared

from

tefi

to fighr.

Examples:

*:$90+1002

JMP

3

+

2*25'4./5_

3

JMP

0097

JMP

$0061

1oo

LDA

*NUM1+NUM2

NUMI

and

NUM2

must

be defined

some-

where

in

the program.

The

instruction

loads

the AccumuGtor

with

the

sum

of

the

numbers

in

the locations

NUM1

and

NUM2.

L-DA

i-ABf,L

€p

$00FF This yields

I he

low

order

b}1e

of rhe value

rr^

QUL

ofLABEL_

3lf

J'ABE

' 56

*i""*'*;H.ntto

"rder

orb''te

orthe

i

' |

i

i

I

j

I

I

. l

. t

. i

- u

I

il

I

I

100

200

300

400

600

610

620

630

These

instructions

are equivalent.

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 91 92

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