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.
- Maria DMA timing has been improved further, with the addition of accurate DMA hole penalties.
- A bug in the existing RIOT emulation has been fixed.
- POKEY sound emulation improvements.
- SALLY (CPU) and MARIA (Graphics chip) performance adjustments.
- Selectable and improved palettes with enhanced screen options.
- Audio indication of no ROM loaded silenced.
- BIOS file(s) no longer required and made optional.
- Streamlined UI including menu options to have an Atari 7800 system focus.
- Implementation of XM control registers updated.
- Graphical register updates made mid-scanline are now displayed mid-scanline.
- Bankset bankswitching support added.
- POKEY@800 added for non-banked, supergame, and bankset formats.
- Machine targets a7800dev and a7800pdev added, which display DMA usage per-scanline.
MAME compatibility and syntax has been maintained, to allow for the reuse of MAME configuration files and front-ends.