Atari 400 Field Service Manual

400 VERIFY
ROM
Press
V
and
RETURN
PASS
Verify
ROM
Teat is
locked into CONTIN-
UOUS MODE
and
is
displaying esch
ROM checksum
and
the word
PASS
or
FAIL
NO
Press D
and RETURN
Press E and RETURN
Press
C and RETURN
Press V
and RETURN
QO)-
NO
Did
ROM E faU
NO
Did ROM F
fail
NO
id
all ROMs faU
NO
I
Swap-out
Z401
-
2403
Go to next
page
YES
Did ROM
D fail
i
YES
YES
YES
Go to RAM
Test,
Page
5-31
Replace
A402 and
retest
Replace
A403
and
rettit
Replace A401
and
t
retest
YES
Replace A401
-
A403
and retest
ATARI
Home
Computer
5-29

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)