A7800 vs BigPEmu

A7800 is a free, open-source Atari 7800 emulator and a fork of the MAME Atari 7800 driver. It runs on Android, Linux, macOS, and Windows; version 5.2 lists 64-bit x64 builds for Linux, macOS, and Windows. The emulator supports Proline and VCS joysticks, lightguns, paddles, driving controllers, keypads, Trak-Balls, Amiga mice, and ST mice. Its listed technical work includes improved MARIA DMA timing with accurate DMA-hole penalties, a RIOT emulation fix, POKEY sound changes, and SALLY and MARIA performance adjustments. Users can choose palettes and enhanced screen options. BIOS files are optional and not required. A7800 keeps MAME compatibility and syntax, allowing reuse of MAME configuration files and front ends. Developer targets can display DMA usage per scanline. The repository is offered under GNU GPL version 2 or later, and the license provides no warranty. The project labels v5.2 as its latest release, including corrections to the POKEY poly9 sequence and initial state.

BigPEmu is an Atari Jaguar emulator for Windows, Linux, iOS and macOS. Its maker says it can run every game in the Jaguar retail library, and that default settings run the library at full speed on almost any x64-capable processor. Jaguar CD support covers the retail disc library, Memory Track and VLM, with a virtual disc system and audio loopback option. Players can save states and record deterministic movies from controller inputs. Visual options include customizable postprocessing shaders, native HDR and per-game profiles, alongside fast-forward and rewind. Input support covers analog, driving and rotary controllers, Team Tap and other devices recognized by the host system. Network features support JagLink games and synchronized states for two to eight players. Scripting includes tasks such as breakpoints and memory access. The desktop download is a zip archive that runs without installation and has an in-app update option. The maker notes that imperfect timing can make some software run too fast at default settings.