This is clearly a variable initialization. Regen claims to have memory access breakpoints but they don’t seem to work. There are about 35 occurrences of “FA44” in the ROM, I can’t think of a better way but examine them all. Of course, rewriting a byte in RAM while playing a game is not that practical, so the next step was to somehow alter the code that manipulates this variable. So, I went to this magic address and wrote 9 there, in Regen’s RAM editor, so we’d remain in the single digits, as the GUI might only print a single character for the continues.
I then wrote a C program to compare the RAM dumps, and, by filtering the valid addresses, only 0xFA44 remained! We didn’t even have to dump 1.dmp! Then to “2.dmp”, and finally, just in case, to “1.dmp”. I dumped the RAM to “3.dmp”, after having 3 continues remaining. So, I fired up Regen (Mega Drive emulator), loaded the ROM and…. Those days are over… you know what days…. So maybe, just maybe, instead of fixing my own bugs, I’ll try to fix Konami’s! Today we’re going to ROM hack!Īnd first of all, I would like infinite continues. So, during last week, we’ve been playing Probotector with my brother and it was fantastic, but unbelievably hard! Cheating time We didn’t buy Probotector because we had the Super NES version, which was equally awesome (maybe a bit better in terms of graphics), but a completely different game. Nevertheless, this was a good opportunity to play some Mega Drive games I didn’t have as a child. So, it’s going to take quite some time until I fix it.
Unfortunately, my code does not work on the real thing, and there are a myriad possibilities why not. Using emulators, I got to the point where I can render a sprite and move it around with the DPad: I got it to start testing my own code on the real hardware.
This little piece of hardware allows you to play any ROM image on a real Mega Drive. I recently bought a Mega Everdrive flash cartridge.
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