Test7800 v0.2.0 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
DL can end with non-zero mode value (bits 5 and 7 ignored)
fixes Ninja Golf (#2), One-on-One Basketball (#9)
corrected the number of cycles in the pre-DMA phase of a scanline
fixes Summer Games (#11), Karateka (#7), Crossbow (#3)
TIA ticked at correct rate and taking slow memory accesses into account
fixes Jinks music and speed samples (#5)
DPPL and DPPH only read at beginning of DMA
fixes Fatal Run (#6), Motorpsycho (#8), Midnight Mutants (#1)
colour kill bit was not implemented
fixes Midnight Mutants (#1)
removed erroneous memory mapping to system ram
fixes Choplifter! (#4)
fixed single stepping in the debugger
Audio
improved synchronisation with video meaning fewer audio buffer underruns
this works well for the Linux version but has not been tested much on Windows
Palettes
changed PAL palette to PAL_LUM3_COOL.pal

Download: Test7800 v0.2.0
Source: Here