We likely would need someone with a Raiden DX PCB to determine which pin(s) these address lines attach to. I believe this is the protection IC, but it's unclear if the version of this chip installed on Raiden II will suppor the higher address lines, and even if it does it would mean running some wires from the program ROMs to this chip to "attach" those address lines. It looks like the ROM address lines are run to the Seibu custom at U0135 (SEI1000 SB01-001). In short this means that they wont support the proper sized ROMs for Raiden DX. looking at the masking on the PCB for these chips though they're labeled "27c020" and indeed checking the pin locations the address line necessary for a 27c4001 EPROM is tied to +5V.
Raiden dx mame install#
The Raiden II PCB has solder holes available for 4x 32pin EPROMs, so my initial thought was to remove the 40 pin sockets for the 27c4096 chips and install the 32 pin sockets for the 27c4001 chips. Raiden DX uses 4x 27c4001 EPROMS while Raiden II uses 2x 27c4096 EPROMS. While the PCBs are "nearly" identical and the protection chip is the same Raiden DX uses program ROMs twice the size of Raiden II. and I'm going to say it'll be difficult and probably ugly if at all possible. So I looked into this conversion a little further today. if I find another cheap working R2 PCB I'll pick it up and try out the conversion to see how it goes. It's also worth noting that the PCBs are masked for their game R2 says "RAIDEN II" and RDX says "RAIDEN DX" considering this there may be other differences between the two PCBs.Īs of right now my R2 PCB is really mint and I don't want to take an iron to it to experiment. I think one of the German releases and some other release that was R2 on a RDX PCB. Interestingly there seem to be some obscure versions of R2 that use the 4x 32-pin 8-bit ICs instead of the 2x 16-bit 40-pin ICs. There are an number of other ROMs on this PCB that are not socketed from the factory, so those would need to be removed in order to perform the conversion. It's unclear if there are any other modifications necessary to accommodate the chip swap. the way it's laid out you'd have to remove the two 40 pin sockets and then install 4 32 pin sockets. The PCB appears to be setup for either sized chip but not at the same time.
Raiden dx mame code#
However R2 stores it's program code on 2x 27c4096 ICs (16-bit 40pin) and RDX stores it on 4x 27c040 ICs (8-bit 32pin). From what I could glean from MAME both games appear to use the same protection code which is good
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