A7800 v5.1 is released. A7800 is a fork of the MAME Atari 7800 driver, with several enhancements added. Support for emulation of Proline Joysticks, VCS Joysticks, Lightguns, Paddles, Driving Controllers, Keypads, Trak-Balls, Amiga Mice, and ST Mice.

A7800 v5.1 changelog:
pokey emulation updated for better two-tone mode accuracy
fix for cart format supergame+ram+pokey@800 crash

Download: A7800 v5.1
Source:Here