Atari 400 Field Service Manual

RAM AND ROM
MODULE INSTALLATION
Refer
to
Figure
*-6
as reference
for the foliowing
two steps.
•
Insert the ROM Module
in
the slot
closest
to the
keyboard.
•
Insert
a
maximum
of three
RAM
modules
in the remaining
slots.
CARTRIDGE
DOOR ASSEMBLY
Refer
to Figure
'^7
as reference for the following
two steps.
•
Set
the cartridge door
assembly on the
top
cover
and slide it to
the rear of
the cover.
This
action engages
the tab
of the door
into the
aluminum
casting.
•
Loci<
the
cartridge
door assembly down
with
the two clamps
next
to the
program
cartridge
slots.
PCS
CONTACT
CLEANING
AND
LUBRICATION
The
following
instructions
explain
the procedures
required
to
properly
clean and
lubricate
the PCB
contacts of
the
CPU,
RAM
and
ROM
boards
once
they have been
removed
from
the
motherboard.
Tools
Required
ZEP
Safety
Solvent or
Isopropyl
Alcohol
Dust-Free
Cloth
Acid
Brush
Board
Cleaning
Brush
Libriplate
(DS-ES
Lubricant)
Procedures
1.
Inspect
the PCB
contact
for flux,
dirt, foreign
material,
and deeply
serated
contact
fingers.
2.
Moisten
the
dust-free
cloth
with
solvent and
clean the
finger
contacts.
Make
sure both
sides
of
the
contacts
are clean and
free of residual
lubricant
and
contamination.
Atari
Home
Computer if-20

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)