Pengo PopCorn ROMs needed for repair

Biltronix

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I don't know if anyone can help me with this because I'm not sure the files exists, but I have an original Pengo board that needs a new set of eproms.

It had an unencrypted set 2, which didn't play the Popcorn music and was a more difficult version of the game.

I'd like to install the first "set1 revc" which is easier and plays the Popcorn music. Unfortunately, the file copy that I have is encrypted and I do not have an original Z80A-custom chip that would work with this file.

I read online that there's a "rare unencrypted ver1" out there somewhere.

Does anyone have the ROM files that I'm looking for?

I know that it's sort of taboo to ask for ROM files on the forum, but I need this for a legitimate board repair and I just can't find the file.

Also, I have a working bootleg board that plays Popcorn but its EPROMs do not work in the original board even with a standard Z80A.

Please help, much appreciated !
 
hobby roms can most likely burn you a set, or bob roberts.

Thanks, while that may be possible if they have the appropriate decrypted files for "set 1 rev c", I have lots of chips and my own programmers so I'd rather just get the files and burn them myself. If I pay for someone else to burn them, that would get the job done. Of course, I could simply read and save the binaries from the chips that they send me for safe keeping. I haven't reached that point yet.

I dug into the MAME source code today and found the decryption functions so I may be able to use that code to decrypt the files myself. If I write a short program to do that, I could test it on the encrypted "set 2" and "set 3" files and compare the results to the unencrypted sets that I already have. If they are good, then I can run it on set 1.

Someone suggested that I could also run the "set 1" game in MAME in debug mode and have it dump the ROM image after it has been decrypted. That just might work assuming that MAME decrypts the entire ROM set before playing. It would make sense that it would. I suppose that it is also possible that it decrypts on the fly, byte by byte, as it plays but that would take more effort on the part of the PC because it would have to keep repeating the same decryption calculations every time it repeated executing the same code again and again. That wouldn't make much sense to do. Anyway, if I can get MAME to produce a decrypted ROM dump then I should be able to break it up into the 8 files required to program the EPROMs.

Bill B.
 
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