Test7800 v0.6.0 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:
Audio
added POKEY soundchip
-audio=stereo for stereo output of both TIA and POKEY
stereo for POKEY is only really effective for dual POKEY ROMs
Cartridge Mappers
and SN2 correctly (previous version was SN1 only)
use -mapper=SN2 or -mapper=SN1 as appropriate

Download: Test7800 v0.6.0
Source: Here