Atari 800 User Manual

116 User's Handbook to the Atari 400/800 Computers
FOR (F.)
CONFIGURATION
X = EXP(a)
EXAMPLE
PRINT EXP(5)
148.413155
A
FOR statement is used with a NEXT statement to form a
repetitive loop within a program.
CONFIGURATION
FOR A = a TO b [STEP c]
Every
FOR statement must have a corresponding NEXT
statement.
EXAMPLE
10 FOR I = 1 TO 5
20 PRINT I;
30 NEXT I
RUN
12345
In the previous example, the FOR / NEXT loop is repeated five
ti mes o Line 20 is the on Iy stateme nt inside the loop , however, any
number of program lines can be placed within a loop.
In line
10, I is assigned the value 1. I is referred to as a counter.
The value of I is incremented where a NEXT I statement is
executed. Here, the program returns to the FOR statement,
where I is incremented by one. This loop is repeated until I is set
equal to 5. When the counter (I) has been set equal to the value
(5), the loop has been executed, the program will proceed with
the statement following NEXT I.

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