In an unmodified front loader, it would probably blink. Codemasters cartridges use a software-controlled CIC stun circuit, and I assume the Aladdin is the same way. So hacking Contra
from mapper 2 to mapper 71
would need a few changes.
- A routine to operate the CIC stun circuit by writing to even and odd $E000-$FFFF.
- Move all mapper writes during operation to $C000-$FFFF, preferably $C000-$DFFF. Writes to $8000-$BFFF in particular will not change the PRG bank.
in FCEUX for Windows, set a breakpoint on writes to $8000-$BFFF, and play through. Does it stop?