Atari 400 Field Service Manual

400 POWER-UP
CATASTROPHIC
FAILURES
AND BASIC
OPSaATIONS
3LACK/GREY
SCREEN
{ cont
)
On the Mother-
board
Swap-out A103. Alll
2103
-
ZX05.
QIQ3,
Q104. and XlOl
Is
a
clear MEMO
PAD
on
the screen
NO
Check and
replace
discrete components
In video
summing
circuitry
Is a clear MEMO PAD
on the screen
YES
Go to POWER-UP,
PART
II, Page
5-8
YES
Go to
POWER-UP,
PART
II.
Page
S-a
NO
Go
to
GREEN/YE14.0W
SCREEN. Page 5-6
!
ATARI
Home
Computer 5-5

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)