Atari 400

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