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| Acmlm's Board - I2 Archive - - Posts by Tony Hedstrom |
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Tony Hedstrom Newcomer Level: 2 Posts: 1/2 EXP: 32 For next: 14 Since: 06-22-05 Since last post: 131 days Last activity: 24 days |
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| It's the checksum that's causing your problems. Here's how to hack the ROM to bypass the checksum... Open up your La Russa ROM with a hex editor. Scroll down (near the end of the ROM) to this address: $0FFA98. At that address, the value should be 60. Change the 60 to 4E. Next, at address $0FFA99, the value should be 02. Change the 02 to 71. Save your changes and the game should bypass the checksum. I tried it and it worked fine for me. In short, this is what we just did... you changed the 6002 instruction at $0FFA98 to a 4E71 instruction. 6002 is a branch instruction, and 4E71 is a NOP (No Operation) instruction. Once you hack that into the ROM, you will be able to make as many changes to the ROM as you want. Tony. P.S. Let me know if you have any problems. |
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Tony Hedstrom Newcomer Level: 2 Posts: 2/2 EXP: 32 For next: 14 Since: 06-22-05 Since last post: 131 days Last activity: 24 days |
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| Glad I could help. Don't know what I was thinking when I typed 60 as the original value instead of 66. Incase you're interested, all Genesis Game Genie "Master Codes" are really just checksum bypass codes. So for Tony La Russa, the master code would be: 0FFA98:4E71 = RH7A-86Y2 Tony. EDIT: Making checksum bypass ROM hacks/codes aren't too difficult, so if you have any other games with a similar problem, let me know and I'll either show you where to hack the ROM, or I'll explain how to do it yourself. (edited by Tony Hedstrom on 06-23-05 12:56 PM) |
| Acmlm's Board - I2 Archive - - Posts by Tony Hedstrom |
