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PostPosted: Wed Mar 29, 2017 3:48 pm 
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VS. Raid on Bungeling Bay does not appear to be part of any of the GoodNES sets. Does anyone know where to find this ROM?


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PostPosted: Wed Mar 29, 2017 3:54 pm 
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Raid on Bungeling Bay
This game consists of seven 8Kbyte EPROMs. Six PRG/CHR EPROMs for first CPU, and one PRG EPROM for second CPU (without any CHR ROM here). This extra EPROM isn't doing anything useful (no sound/video output, and coprocessor-like maths), it's just doing a short handshake with the other CPU, and then it hangs in an endless loop.
The purpose is unknown; it may be some crude protection (won't work if the extra EPROM doesn't say "I am here"). Or maybe the game supports DUAL mode (and in UNI mode, requires the second CPU to say "I am NOT here").
Basically, the game needs a response IRQ from other CPU (with don't care response at 67E0h-67FFh), and additionally DIP 5 must be ON.
As such, the game can't be encapsulated in .NES (nor UNIF) formats—at least, not without hacking that protection out. You'll probably have to find it in a MAME set.


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PostPosted: Wed Mar 29, 2017 4:13 pm 
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Yikes!


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