> > > the mcu that brings these games are all the same or vary in different pcb? > > > > It's not an MCU, it's a fixed-function ASIC. Kale can speak to the details better, > > but the functionality is somewhat different on different games. > > Actually, functionality is the same for all the games minus Seibu Cup Soccer (has an > earlier revision of the COP ROM, unknown purpose as per now). The only real > differences between Legionnaire and Raiden 2 HWs functionality so far known is the > endianess of some commands, but that's mainly because of the different CPU used (m68k > vs. i86) and some ports are shuffled around via a PAL, in a clear attempt to not > allow exchanging/upgrading of the boards.
What is the mystery behind the COPX roms? MAME source and PCB infos of the Legionnaire games says:
Denjin Makai and Godzilla uses a COPX-D2 (copx-d2.313 - user1, 512k). These roms are dumped and they are identical. SD Gundam Sangokushi uses a COPX-D2, the rom is also dumped, but only the first 256k. These 256k are identical to the first 256k of the Denjin Makai/Godzilla COPX-D2. Seibu Cup Soccer uses a COPX-D1 and the rom was dumped. When you compare it with the Denjin Makai/Godzilla COPX-D2 it is identical, except the last bytes at 3FFC-3FFF and 7FFC-7FFF, they are filled with $FF in the Denjin Makai/Godzilla COPX-D2 and $00 in Seibu Cup Soccer COPX-D1. Legionnaire uses a COPX-D1, but it is not dumped. Can it use the Seibu Cup Soccer COPX-D1 ? Heated Barrel uses a COPX-D2, but it is not dumped. Can it use the Denjin Makai COPX-D2 ?
M*A*S*H
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