LibretroAdmin
4e7fbc7376
Atari800_nframes drives the emulated R-Time 8 clock, so a restore needs it to resume at the same point. Both writers store it and both readers take it when the state is version 9 or newer, which leaves versions 3 through 8 loading as before. Save-state replay is now bit-exact in RAM and video: run 300 frames, save, run 400 and hash; restore, run 400 and hash again. Audio still shifts by about 0.66 ms across a restore because the sound renderer's queue depth, fractional sample accumulator and resampler position stay outside the state. retro_serialize_size() is unchanged at 188740 bytes. States written here are refused by cores built before the bump, which report the version mismatch rather than misreading the data.
libretro-atari800
Libretro port of the Atari800 emulator — Atari 8-bit computers (400/800/600XL/800XL/130XE/XEGS) and the Atari 5200 console.
The bundled Atari800 core is version 7.0.0. The upstream emulator is
maintained by the Atari800 Development Team (see atari800/DOC/CREDITS)
and is released under the GPL (see atari800/COPYING).
Controls
Four controllers are supported when the emulated system is set to 400/800 — useful for games such as M.U.L.E.; see the Atari 4+ player list.
Atari 8-bit mode
| Button | Function |
|---|---|
| D-Pad | Joystick direction |
| B | Fire 1 |
| A | Fire 2 |
| Y | Space / Fire 3 |
| X | Return |
| L | Option (CONSOL) |
| R | Atari800 menu |
| L2 | Esc |
| R2 | Help |
| L3 | Virtual keyboard toggle |
| Select | Select (CONSOL) |
| Start | Start (CONSOL) |
Atari 5200 mode
| Button | Function |
|---|---|
| D-Pad | Joystick (digital) |
| B | Fire 1 |
| A | Fire 2 |
| Y | Numpad # |
| X | Numpad * |
| L | Numpad 0 |
| R | Numpad 1 |
| L2 | Numpad 2 |
| R2 | Numpad 3 |
| L3 | Numpad 7 |
| R3 | Virtual keyboard toggle |
| Select | Pause |
| Start | Start |
BIOS / firmware
The core uses the optional ROM files listed in atari800_libretro.info
(5200.rom, ATARIBAS.ROM, ATARIOSA.ROM, ATARIOSB.ROM, ATARIXL.ROM,
BB01R4_OS.ROM, XEGAME.ROM). When real ROMs are not present, the
bundled AltirraOS replacement ROMs are used.
Building
make -f Makefile
Standard libretro platform= overrides apply
(platform=unix, platform=win, platform=wiiu, platform=ps2, ...).
Links
- Libretro core: https://github.com/libretro/libretro-atari800
- Upstream Atari800 emulator: https://atari800.github.io/
- Upstream documentation: see
atari800/DOC/(README,INSTALL,USAGE,FAQ,NEWS,BUGS,TODO)