> It may as well be a "rare
> case" where the FPGA will have to be emulated on a bitstream (seeing how gun/analog
> inputs are involved). At least I could see why hooking proper inputs for Area 51:
> Site 4 proved difficult.
Rare, perhaps, but not unique. Sega's 837-12079 light gun board used by Virtua Cop 2 and other Model 2 games is another FPGA-based solution, here using a Altera FLEX EPF8282ALC84-4 along with a MB3771 power monitor, various logic and interface chips, and a Sega 315-5338A I/O controller. Sega's Naomi-era 838-13143 "GUN SENSE HOD" board instead uses a standard MCU model with an external EPROM, though its architecture (NEC 78K/2) isn't supported in MAME yet.
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