Atari 800 Návod k obsluze stáhnout pdf (Strana 21)

HOW

TO

\

/RITE

This

section

showshow

to

write

operands. The

examples

use statemenr

number

OPERANDS

xxxx

(also

caled line

number

xxxx).

An

insiructi;

entered

without

a siate_

ment

number

is not

alowed

by the

Editor.

.

The

examples

use By

(for

b)1€)

and ABS

(for

absotuie)

as a one_byte

and

a two_

byte

number,

respectjvety.

Thi$

use implies

rhar

the

proeram

i;cludes

defini_

rions

ofBy and

ABS rs. ror

exdmptc:

0100 By=

155

0200 1\85=567

pl€ase

refer

to rhe

d€scripiion

ofthe r,ABL

=

direcrive

fbr

an exptanarion

ofthe

definitions

of lines

1oo

and 200.

Hexadecimal

Operands

A number

is interyrcied

as a decimat

number

unless

ii is preceded

by

g,

in

which

case it is interpreied

as a hexadecimal

number.

Examples:

30 sTA

99325

80 ASL

915

Imrnediare

Operands

,\n immediate

operad

js_

an operand

that

contains

the dara

ofrhe instruction.

The pound

sign

(/l

must

be

p;sent

io indicate

an immediar€

operand.

E"xamples:

40 LDA i72

70 oRA ,fg3c

1OOO

CPY

/BY

Pag€

Zero

Operands

when_an

operand

is

a number

less

than 2s5

decimdl,

(FF

h€x)

and is

not

immediate,

the

number

is inrerpreted

a$

a

page

zero

address.

Example8:

150 LDX

912

250 ROR

33

5OO DEC

!Y

Absolute

Operands

Absotuie

operands

are evaluated

as

16_bii numbers.

Examples:

20

LDX

91212

40

cPY 2345

990 DEC

579

2350

nIT

AB5

Absolure

tndexed

Operands

An absotut€

indexed

operand

uses

regist$

x or

y.

The

operand

is written

_,x

or

_,Y

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 91 92

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