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picoarch - a libretro frontend designed for small screens and low power

picoarch runs libretro cores (emulators) for various systems with low overhead and UI designed for small screen, low-powered devices like the Trimui Model S (PowKiddy A66) and FunKey S.

It supports:

  • Arcade (mame2000, fbalpha2012)
  • Colecovision (blueMSX, smsplus)
  • Game Boy / Game Boy Color (gambatte)
  • Game Boy Advance (gpsp)
  • Game Gear (picodrive, smsplus)
  • Genesis (picodrive)
  • MS-DOS (dosbox-pure)
  • MSX (fMSX, blueMSX)
  • NES (quicknes, fceumm)
  • PCE / TurboGrafx-16 (beetle-pce-fast)
  • PICO-8 (fake-08)
  • PlayStation (pcsx_rearmed)
  • Pokémon Mini (pokemini)
  • Sega Master System (picodrive, smsplus)
  • Super NES (snes9x2002, snes9x2005, snes9x2005_plus, snes9x2010)
  • more to come

picoarch can also play game music (gme).

All emulators have:

  • FunKey menu
  • fast-forward
  • soft scaling options
  • START+button combo keybindings
  • per-game config
  • screenshots

Most have:

  • FunKey Instant Play (close / reopen device, requires core with save states)
  • autosave and resume (requires core with save states)
  • cheat support
  • IPS/BPS softpatching
  • auto-frameskip for smooth audio

Install

Mount USB and copy .opk files into Emulators directory. Each core has its own .opk.

picoarch.opk is a standalone app with its own file browser that can be used to run any supported core, and can be used instead of individual core .opk files.

Notes / extra features

BIOS

Some emulators require bios files. bios files are placed into /mnt/FunKey/.picoarch/system. This directory is created after first launch.

The libretro documentation specifies which bios is required for each core. For example, needed fMSX bios files are listed here: https://docs.libretro.com/library/fmsx/

Cheats

Cheats use RetroArch .cht file format. Many cheat files are here https://github.com/libretro/libretro-database/tree/master/cht

Cheat file name needs to match ROM name, and go underneath save directory. For example, /mnt/FunKey/.picoarch-gambatte/cheats/Super Mario Land (World).cht. When a cheat file is detected, a "cheats" menu item will appear in advanced menu. Not all cheats work with all cores, may want to clean up files to just the cheats you want.

IPS / BPS soft-patching

Many cores can apply patches when loading. For example, loading /roms/game.gba will apply patches named /roms/game.ips, /roms/game.ips1, /roms/game.IPS2, /roms/game.bps, etc. Patching is temporary, original files are unmodified. Patches are loaded in case-insensitive alphabetical order. Note that .ips12 loads before .ips2, but after .ips02.