atari800 emulates the Atari 800, Atari 800 XL, Atari 130 XE and Atari 5200 Games System. The code was written with portability in mind and that allowed various people to create ports of Atari800 for PC, Amiga, Atari, Mac and machines running UNIX-like operating systems DESCRIPTION. So it was available with full source code in C.

Atari800 emulator was written by David Firth in 1995 and released under the GPL.