Atari 400 Field Service Manual

SECTION I
THEORY
OF OPERATION
OVERVIEV
The Atari
*00 Computer
Home
Console
contains
the central
processor
unit (CPU)
and
memory
in the
form
of the
Operating
System
(read-only-memory
(ROM))
and 8K or
16K of
user
programmable
random
access memory
(RAM).
The
console
contains
the
keyboard,
cartridge
slot,
controller
jacks,
and serial
input/output (I/O)
port for
connecting
peripheral
devices
(see Figure
l-U.
rawci
oNforr
SWITCH
KiirmsAL
CONNECTOa
JACK
SYSTIM RESET
SWITCH
Figure 1-1.
ATARI
^00
Home
Computer
Console
ATARI
Home
Computers
1-1

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)