Atari 400 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 400 Specifications

General

Manufacturer	Atari
Model	400
Type	Home Computer
Release Year	1979
CPU	MOS Technology 6502
CPU Speed	1.79 MHz
ROM	10 KB
Operating System	Atari OS
Keyboard	Membrane keyboard
RAM	8 KB (expandable to 48 KB)
Graphics	ANTIC and GTIA chips
Sound	4 channels
Display	RF output for connection to TV
Storage	Optional cassette tape drive or floppy disk drive
Ports	Cartridge
Display Resolution	320x192 (16 colors)