Atari 400 Field Service Manual

Table
5-1
CLOCK
CIRCUIT
PIN NUMBER
BOARD
CPU
FREQUENCY
1-789
SCOPE CHART #
21 of
JlOl
1
22 of
JlOl
CPU
1.739
2
3 of Z302
CPU 1,789
2
9
of Z302 CPU 1.789
1
10
of
Z302
CPU 1.789
2*
13 of
2302
CPU 1.789
3
37
of
A303
CPU
1.140
4
6
of Z301
CPU
1.789
3
34
of
A302
CPU
1.789
3
35 of A302
CPU 3.579
5
29
of A301
CPU 3.579
5
23
of A301
CPU 3-579
6
Collector of
Q102 300 Main
Board 3.579
6
Collector
of
Q104 400
Main Board 3.579
6
7
of AlOl
400/300 Main
Boaard 1.789
1
25 of A102
400/300 Main
Board 1,789
1
*
Use
Scope
Waveform
Legend
on next
page
to see
illustration
of waveform.
ATARI
Home
Computer
5-36

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)