Test7800 v0.4.1 is released. Test7800 is an experimental emulator for the Atari 7800. It's not complete and is missing some important features but it plays many of the 7800 ROM files that are available. It supports a78 files and will emulate regular "flat" ROM files and also "supergame" ROM files. It does not yet emulate the POKEY chip and similar hardware. The 6502, TIA and RIOT emulation is taken from Gopher2600 and is therefore well tested. The implemenation of the MARIA is new to this project.

Test7800 Changelog:
Bug fixes
INPT2 and INPT3 should have high bit set when joystick is plugged in
fixes Crazy Brix
extended bottom of visible screen by one for both NTSC and PAL
to match information given by '7800 Test (20141231).a78'
delay after interrupt is not DMA blocking
Kung-Fu Master [#14]
Ikari Warriors [#16]
DMA now only ever starts at end of CPU cycle
Ace of Aces [#17]
improves DMA tests in '7800 Test (20141231).a78'
corrected DMA maximum cycles limit
fixes Super Skateboardin' [#15]
corrected RIOT timer address mapping and tick rate
fixes Beef Drop [#13]
Bug fixes [Windows]
emulator will exit correctly if ROM fails to load from file dialog [#18]
this fix is still contested

Download: Test7800 v0.4.1
Source: Here