Atari 130XE User Manual

Q. I just tried the computer's built-in ATARI BASIC. I typed in a
program, but it won't run. Why not?
A. Make sure you pressed 1 Return 1 after each program statement
before typing RUN. When you press 1 Return I, you are telling the
computer that you are entering information.
Another common mistake
is to confuse zeros and capital letter O's.
Though they look similar, the computer treats them differently.
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Atari 130XE Specifications

General

Type	Home computer
Release year	1985
CPU	MOS Technology 6502C
CPU Speed	1.79 MHz
RAM	128 KB
ROM	24 KB
Graphics	ANTIC and GTIA chips
Manufacturer	Atari
Display resolution	320x192
Sound	POKEY chip, 4 channels
Storage	External floppy disk drive, cassette tape
Ports	2 joystick ports
Operating System	Atari BASIC