Atari 400 Service Manual

Figure 5-16. 800 Console Motherboard, Locations
800 Motherboard
• A101 POKEY chip - Used to control POT lines, audio signal, keyboard
information lines as well as printer and floppy control lines.
The PORT Test indicates a defective POKEY chip by displaying '1'
in Rows G, H in any position.
• A102 PIA chip - Used to control joystick lines, and Program
Cassette Recorder control Lines.
The PORT Test indicates a PIA chip by displaying a ' 1' in Rows,
A, B, C, D, or E in any position.
5-29 System Service Manual

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)