> MAME has a very complete, cycle-accurate 8237A DMA device under the AMD part number: > am9517a.c/.h. > > There's also an older i8237 emulation that isn't as good; it couldn't support e.g. > SoundBlaster and other ISA DMA in the MESS PC driver so am9517a.c was born. But some > drivers haven't been converted to the better implementation yet.
We'll see
Some mystery solved: JP2 selects A15 on the EEPROM JP3 selects A16 on the EEPROM