Similar to the Simpsons free play ROM hack I did ( http://forums.arcade-museum.com/showthread.php?t=378060 )... here's a free play ROM hack for the 4 player TMNT. One of the main problems with TMNT for home use is inevitably someone will hit the credit button a bunch of times, adding a bunch of lives, then get bored and walk away... leaving everyone else to kill off all those lives.
This hack has the full attract mode, and to start/continue, you simply press any button. It adds 2 lives each time you start/continue, so if someone walks away, it's easy to kill them off. Of course you just press a button to join in or continue during gameplay.
I've only done the "World" ROM set so far ("tmnt" set in MAME), though hopefully the other 4P sets will be very similar (it's too late tonight... I'll check tomorrow). I can't make promises, but I plan to at least do a 4P US set... 2P sets may be quite different, so they may not get done. This does freeplay only... there is no DIP or menu selection to enable/disable free/coin play.
Anyway, attached is the hacked ROM set... burn the 2 ROMs to 27C010 EPROMs and swap with the corresponding chips at locations J17 and K17.
I've only briefly tested it (both in MAME and on a PCB on my testbench), so if you try it out, let me know how it works and/or if you find any bugs.
EDIT: All 4P ROM sets in MAME have been patched, and available for download in these posts: http://forums.arcade-museum.com/showpost.php?p=3376157&postcount=8 and http://forums.arcade-museum.com/showpost.php?p=3376159&postcount=9 .
DogP
This hack has the full attract mode, and to start/continue, you simply press any button. It adds 2 lives each time you start/continue, so if someone walks away, it's easy to kill them off. Of course you just press a button to join in or continue during gameplay.
I've only done the "World" ROM set so far ("tmnt" set in MAME), though hopefully the other 4P sets will be very similar (it's too late tonight... I'll check tomorrow). I can't make promises, but I plan to at least do a 4P US set... 2P sets may be quite different, so they may not get done. This does freeplay only... there is no DIP or menu selection to enable/disable free/coin play.
Anyway, attached is the hacked ROM set... burn the 2 ROMs to 27C010 EPROMs and swap with the corresponding chips at locations J17 and K17.
I've only briefly tested it (both in MAME and on a PCB on my testbench), so if you try it out, let me know how it works and/or if you find any bugs.
EDIT: All 4P ROM sets in MAME have been patched, and available for download in these posts: http://forums.arcade-museum.com/showpost.php?p=3376157&postcount=8 and http://forums.arcade-museum.com/showpost.php?p=3376159&postcount=9 .
DogP
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