Unofficial MAME 0.142 PS3 GameOS port
http://code.google.com/p/psmame/

Installing:
  Install the psmame package onto your jailbroken PS3 using normal means.
  By default all data paths for mame are located under /dev_hdd0/ROMS/mame_data.
  ROMS themselves can be placed anywhere and their location chosen with the frontend. The recommended path is /dev_hdd0/ROMS/mame.

Default controls:
  As of right now the only defined controls are R3 to open the MAME config menu, Select for coin, and Start for starting the game.
  Further control changes can be made in the MAME config menu as needed.
  Up to four controllers can be used at one time.

Frontend:
  The frontend can display screenshots of games, these should be placed in /dev_hdd0/ROMS/mame_data/snaps. You can find a full set at http://www.progettosnaps.net/snaps_en.html

Paths:
  Under /dev_hdd0/ROMS/mame_data
    hash:	path to hash files
    samples:	path to samplesets
    artwork:	path to artwork files
    ctrlr:	path to controller definitions
    ini:	path to ini files
    font:	path to font files
    cheat:	path to cheat files
    crosshair:	path to crosshair files
    snaps:	path to screenshots for frontend

  Under /dev_hdd0/game/MAME90000/USRDIR/data
    cfg:	directory to save configurations
    nvram:	directory to save nvram contents,
    memcard:	directory to save memory card contents
    inp:	directory to save input device logs
    sta:	directory to save states
    snap:	directory to save screenshots
    diff:	directory to save hard drive image difference files
    comments:	directory to save debugger comments


Known issues
  When adding ROMs into your ROM dir, you must tell the frontend to rescan them. This can be done in the R3 menu.
  The display currently only supports scaling by pixel aspect ratio. Future versions will support various aspect correction modes.
  Changing video settings in the menu may crash MAME, they don't work anyway so don't bother.
  Games which require a recompiler will not run.
  Games which have high memory requirements will not run, the PS3 only has a little of 220MB of RAM available.
  The default controls will need to be tweaked by the user.