Test7800 v0.9.0 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:
Features
added mRAM cartridge type
used by the Rescue on Fractulus prototype
added Souper mapping
used by Rikki & Vikki
boop sound not implemented yet
biasing of screen aspect ratio
screen pixels are no longer exactly square and are now slightly taller than they are wide
added -pokey command line option
allows explicit specification of pokey chip and
eg. -pokey=450 will add a pokey at address $0450
Bug Fixes
paddle resistance
some games (like Crazy Brix) would not move the full range
log messages when loading ELF, flat, mRAM cartridges
the filename wasn't printed in the insertion message
audio registers cleared on reset
selecting a new cartridge when sound was playing could cause audio to continue from the old cartridge
fixed tick frequency of RIOT
RIOT timers would tick and expire too quickly

Download: Test7800 v0.9.0
Source: Here