Atari 5200

Atari 5200 Tech Page -  http://atarihq.com/danb/a5200.shtml
Atari 5200 Tech and Specs Page  Detailed information

AtariAge - Atari 5200 Emulation -  http://www.atariage.com/5200/emulation/index.html?SystemID=5200
Emulators, ROMs, FrontEnds, Tools - you'll find it all here.  Detailed information

Jum's A5200 Emulator -  http://www.geocities.com/james7780/emulators/emu5200.html
The Atari 5200 emulator (Jum52) is available as a 32-bit MSDOS application, or a Windows application (tested on Windows 98, 2000 and XP). There are also Mac, BeOS, QNX and Playstation 2 ports development.  Detailed information