Atari 400 Field Service Manual

CPU, RAM, AND
MOTHERBOARD ACCESS
To remove the module assembly, perform
the steps
in the
exact order
given.
Use
Figure
^5 as
a
reference
for the
following
two steps.
Disconnect and remove speaker assembly.
Lift module
assembly out of the bottom cover.
CPU
AND RAM REMOVAL
To remove
the
CPU
and
RAM
printed circuit boards,
perform
the steps in the exact
order given.
Use Figure
*-5
as
a
reference
for the following
six steps.
Close and
latch the cartridge door.
Set the module
on its back-
Remove
the eight screws
from the bottom
shield
and lift off the shield.
Lift
the motherboard
assembly
out of the aluminum
casting.
Carefully
unplug the CPU
and/or RAM
boards.
Unhook
and remove
the
plastic cartridge
guide.
ATARI
Home
Computer
if-6

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)