That's it! won't work due to some unknown thing like a jumper. If attempting to port to hammering harry pal you would be looking at the h1 roms issue on top of the original issue.After hours of looking at the board could not see anything.
If it was still here you would have a diagram right now, Sadly the H.H ended up going back to his owner a little experimenting.
Then has the smaller size of h1/l1 ROMs of HH been proven to be a problem? I mean what happens if we just slightly modify the code to jump to the "theoretically" unmpapped area and just return then to see if code is correctly executed on real hardware? I'm sure you see what I mean, like modifying the start code vector and then calling it from the jump we made outside "normal" ROM area.
Just trying to understand why it doesn't work when other crazier conversions cause no problem (encrypted M84 ported to older unencrypted M72).