Atari XE User Manual

4. Press [Select] to select a test (that test will blink), then
press
[Start] to begin. The test will begin and continue
runn i
ng until you press [Reset] .
Note: If you have a keyboard connected to your system ,
pressing
[Help] while a test is running will redisplay the Self
Test menu.
As
long as you experience trouble-free operation with your
XE , conducti ng the system diagnostics every few months
should
be a sufficient checkup for your system.
Memory Test
The memory test checks ROM (Read Only Memory) and RAM
(Random Access Memory). ROM is nonerasable memory
containing the computer's operating system , ATARI BASIC ,
and Missile Command. RAM is temporary memory holding
the programs you write with
ATARI BASIC or load from disk
or cassette.
The memory test works something
like a stoplight. When
ROM is tested, two bars appear on screen. If the bars turn
green,
ROM is working correctly. If the bars turn red , ROM
needs servicing.
HEHORV TEST
RAH
1111111111111111
1111111111111111
1111111111111111
When RAM is tested , 48 small squares appear, each represent-
i
ng 1 kilobyte of RAM . If a square turns green , that kilobyte is
good . If a square turns red , RAM needs servicing .
Note : If you entered the Self Test program from ATARI BASIC ,
you will see 40 squares instead of 48 during the memory test.
ATARI BASIC is using the other eight kilobytes of RAM .
16

Atari XE Specifications

General

Manufacturer	Atari Corporation
Memory	64 KB RAM
Sound Channels	4
CPU	MOS Technology 6502C
CPU Clock Speed	1.79 MHz
Graphics	ANTIC and GTIA
Colors	256
Display Resolution	320x192, 160x192, 80x192
Sound	POKEY
Media	Cartridge, Cassette, Floppy Disk
Ports	Cartridge, SIO, Monitor, Power, Joystick
Operating System	Atari OS