I assume there are no cartridge emulators that can run MD2 images? KFF(2), or UII+?
Viewing post in SNK vs CAPCOM for C64/C128 - Stronger Edition comments
That's it. I actually changed the HW code byte on the CRT images and they are launching now. Had few crashes though when playing...but not consistently. Testing on C64 and C128. I've mentioned it to Travis and he's looking at a firmware change. What's different about the Denise one? Just the HW code?
Denise uses ID 85 (starting with version 2.7, which will be released soon) for MD2. Older MD2 CRTs use ID 79, which was never officially assigned to MD2 but wasn't in use at the time. At some point, ID 79 was assigned to HyperBasic.
For compatibility with older MD2 CRT versions, it checks whether the ROM size exceeds 1 MB. If this is the case, it switches to MD2 instead of HyperBasic.
In the next version, Denise will support C128 in C64 mode (2 MHz) and the C128 version with scrolling can be used.