Atari 850 Interface Operators Manual

  Atari 850 Technical Manual

  Atari 850 Ports

  Atari 850 Schematics

  850 Interface Handler Source Code 

  Atari Telelink Source Code

  Atari Telelink II Source Code

  Atari PLATO: Learning Phone Source Code

Atari 850 Serial Port #1

Atari 850 Serial Ports 2 & 3

Atari 850 Serial Port 4

Atari Serial Port 4 TTY Configuration

and Centronics Parallel Printer Port

Updated 4/8/2019