Hi there,
I just received a Stone Ball PCB.
It's a 2P version 1-20 with build date 21/10/1994.
The PCB features the 3P and 4P controls connectors but 2P EPROMs (U101 & U102)and PIC(U1003). Usually, 2P boards lack these.
This could be a 4P board converted to 2P but I don't see the point of doing this since the 4P version can easily be set to 2P by switching a dipswitch.
ROM stickers are hand written instead of factory printed. EPROM U101 is a ST M27C2001 and EPROM U102 is a TMS 27C020-15. It also features an AM27C040 EPROM at U801 (Sound).
Build dates of versions currently in MAME (both 1-20) are 7/11/1994 for 2P PCB and 13/12/1994 for 4P.
Since this board has an earlier build date and EPROMs everywhere, could this be a prototype?
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NPlayers.ini - The multiplayer description file for MAME. (Linux user #448789)
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