Atari 400 Field Service Manual

* • *
NOTE
* *
»
Once
you have
isoJated the
problem to either
the RAM,
ROM,
or
CPU
boards, clean the board
edge connectors
and retest the boards.
The SALT
11 cartridge
takes you through the
next phase of
tests. Use the SALT II
cartridge
to perform
the following
tests.
SALT
n Menu
Figure 3-3
illustrates
the
SALT
II
menu of tests. The
highlighted
character
in
Figure
3-3
is red
on the screen
and is the command
letter
for each test.
ANYV
COLO
Keyb
IPORT
mi
mi
2
PRO
HELP
IDEO
RBARS
TEST
IBOOT
B
IDT
SPLAY
LIGHT
PEN
?HELP
DUCTION
TEST
Figure 3-3.
SALT II
Menu
ATARI
Home
Computer
3-5

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)