It was developed completely from scratch and uses the SDL library for a UI and audio and graphics output (from OpenGL). This is a Atari 8-bit/800XL emulator written in C by Sascha Springer.
Kat5200 is an emulator for the Atari 5200 and 8-bit computers (800/XL/XE). Our main objective is to create a freely distributable portable emulator (i.e. Atari800 is the emulator of Atari 8-bit computer systems and 5200 game console for Unix, Linux, Amiga, MS-DOS, Atari TT/Falcon, MS-Windows, MS WinCE, Sega Dreamcast, Android and other systems supported by the SDL library.