Atari 800 User Manual

Atari BAS IC Reference Guide 109
EXAMPLE
10 DIM X(3)
20 FOR I = 0 TO 3
30 READ X:X( I) = X
40 PRINT X( I ),
50 NEXT I
60 DATA 1 2, 14, 13, 15
RUN
12 14 13 15
Noti ce that 4 values ca n be ass igned to a vari able that has a
dimension of 3. This is possible because each array's initial
eleme nt h as a subs cript of o. The array ca n be r ep r ese nted as a
table of values as shown in the following illustr at ion.
o
1
2
3
X 12 14
13
15
The numb er in the DIM stateme nt indicates the largest s ub scr ipt
that can be used.
It should be n oted from the exa mpl e (line 30) th at s ub sc ript ed
variables can n ot be u se d in a READ statement. As a r es ult , a
separate statem
ent is needed to ass ign the subscri pte d variable.
The ass i gnme nt stateme nt can be on the sa me lin e (as s hown
her e) or on a separate lin e.
Num eric variables can also be u sed with two subscripts. This
results in a two dimensional array, or matri x. For exampl e, if X is
dimensioned in the statement DIM X(3,2) the following table
would result.
X
o
1
2
3
o
1
2

Atari 800 Specifications

General

Processor	MOS Technology 6502
Processor Speed	1.79 MHz
ROM	10 KB
Graphics	ANTIC and GTIA chips
Release Year	1979
Display Resolution	up to 320 x 192
Colors	128 colors
Sound	4 channels
Storage	Cartridge, cassette, floppy disk
Ports	Cartridge, serial, monitor
Operating System	Atari OS