![]() So, once started, MAME has the decrypted ROM in memory, ready to be dumped. when MAME starts pacplus, it decrypts the entire ROM and then executes it normally (doesn't decrypt on the fly). feel free to ask if you have any problems/questions. Or, just a bit of trial and error by making the change to the encrypted ROM, then looking at how it decrypts until you figure out how to get the answer you're looking for.Īnyway, I hope this helps. But you could look at the algorithm in the source: and reverse it by hand. If you want to re-encrypt the ROM so speedup runs on the epoxy block, that'll take a bit of manual work, since MAME doesn't natively encrypt the ROM. Once you're using the decrypted ROMs, you should be able to patch the ROM for speedup. Pac-Man Plus (Arcade) for free in your browser. Tetris (cocktail set 2) No sound Play Ms. Street Fighter Zero 2 Alpha (960813 Hispanic) 0. Street Fighter II' - Xiang Long (bootleg set 1, 811102 001) Bootleg 8. I didn't test this on real hardware, but I did swap the ROMs into the regular MAME pacman set, and it worked. Samurai Shodown / Samurai Spirits (NGM-045) Arcade. If you burn these and put them in your Pac Plus board, it should run without the epoxy block. Only the main CPU ROMs are encrypted, so you don't need to worry about the other ROMs. You'll find the pacplus_d files that you created in the root of your MAME directory (where your mame executable file is). The 3rd argument is the length, which is the size of each ROM. ![]() You can get this from the MAME driver: (6e starts at address 0, 6f starts at 0x1000, etc). The first argument is the file name (I called it the same name as the original, except with an _d for decrypted). The save command saves the game's (decrypted) memory to a binary file. It is a sequel to the original Pac-Man game and features similar gameplay. Then go to the command line inside the MAME debugger (not the window that you started MAME from) and type: Pac-Man is a 1982 maze arcade video game developed by General Computer Corporation and published by Midway. so from a command line, type mame -debug pacplus. But rather than just doing the work for you, I'll walk you through it, and help you understand it.įirst, you need to start pacplus in MAME in debug mode. Having won their enhancement kit lawsuit against Atari, General Computing went to Bally Midway and showed them an enhancement kit that they were working on for Pac-Man called Crazy Otto. I'm going to assume you're not familiar with the debugger, MAME drivers, etc. Pac-Man was released on Januin the USA, even if the copyright year is 1981. If you're familiar with the MAME debugger, it's trivial to dump the decrypted ROMs.
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