Atari 800 User Manual

Atari BASIC Reference Guide 123
The GET statement only accepts one character, followed by
RETURN. If only one character is entered , the GET statement
assigns
the ASCII code of that character to the variable X. Line 30
displays the value of X which is 83, since the ASCII code of Sis 83.
Line 40 closes the 1/ 0 channel.
COSUB (COS.)
GOSUB branches program control to the subroutine beginning
at the line number specified by its argument.
CONFIGURA TlON
GOSUB LN
Subroutines can be called from any part of a program. A RETURN
statement, at the end of a subroutine , causes the program to
resume execution with the statement directly after the GOSUB
statement.
Subroutines are
convenient to use when the same set of
operations need to be repeated at different parts of a program.
EXAMPLE
10 FOR J =OTO 2
20 GOSUB 100
30 NEXT J
40 J = 5
50 GOSUB 100
60 END
100 PRINT j;
110 RETURN
RUN
0125
The previous example illustrates a subroutine that is called 4
times,
from 2 different parts of the program. In this example,
only one statement is includ ed in the subroutine. However,
many statements can be included in a subroutine.

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