Megadrive Studio , is a debugger for the Megadrive/Genesis System it focus on SNASM68K, as it can load symbols from the .map outputed by that compiler. But it can load any megadrive game

The project is oooooooold , it was programmed in 2005, and is based on Genesis Plus from Charles McDonald.

you can :

  • See disassembly code
  • Step into code
  • Step a frame
  • Dump 68k, z80, vram, vsram, ram
  • vdp registers calculator
  • Support Gens KMOD debugging features
    • write to vdp reg #29 to force a code break
    • write to vdp reg #30 to log a char

The project is on GITHub and releases are available here