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Author Topic: Serious emulation problem with Monster Race (GB)?  (Read 4285 times)

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Krys3000

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Re: Serious emulation problem with Monster Race (GB)?
« Reply #15 on: September 04, 2017, 04:55:40 pm »
Hey, I have one of those GBA Movie Player! Good times playing NES on my DS Fat.

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Re: Serious emulation problem with Monster Race (GB)?
« Reply #16 on: September 07, 2017, 09:43:33 am »
I finally took a look at the "bad dump", turns out it's not really a "bad dump", someone modified the ROM.

Entry point jumps to 0:00e0, which is just nops in the good dump, but this space was used to add the following code:


ld a,0
ld [$6000],a
ld a,$30
ld [$6000],a
jp $0150


This code makes no sense, the header says it uses MBC1, where $6000 is a 1-bit wide register that flips between two different banking modes. Maybe this is for flashcart compatibility?

In addition, a ld a,1 got patched to ld a,0 at 00:024C, and again at 01:488E.

Finally, the header checksum got patched.
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Pokémon: arbitrary code execution 1996-2016

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Re: Serious emulation problem with Monster Race (GB)?
« Reply #17 on: September 08, 2017, 08:05:07 am »
Well then... we have our answer.
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