MAMEWorld Forums - EmuChat - Re: Gundam Wing: Endless Duel

> I had a quick look at this today, based on the SVN comment from David Haywood that
> the decryption is done but it still doesn't start.
>
> It still doesn't start because the entrypoint value is wrong. Right now, it's
> pointing in the middle of an instruction, like this:
>
> BRK #$20
> MVP $22, $CF
> ROL $A3
>
> which makes no sense at all. However, if we shift that by just one byte, we get a
> more meaningful disassembly:
>
> LDY #$00
> JSR $CF44
>
> That aside, the interrupt handler looks like this:
>
> LDX $12
> JSR ($8875,X)
>
> but the first 32 pages are full of #$55, so ($8875,55) points right into code,
> because there are only 12 entries in the table.
> It also appears that there's a REP #$20 that should be active but isn't, because of
> this:
>
> A326: LDA #$FC
> A328: ORA ($85,X)
> A32A: JSR $20E2
> A32D: LDA #$E0
>
> makes much more sense like this:
>
> A326: LDA #$01FC
> A329: STA $20
> A32B: SEP #$20
> A32D: LDA #$E0
>
> especially because $20xx is full of #$A0. The code is interspersed with #$00 which
> look like they're supposed to the high byte for constant loads.
> The disassembler doesn't seem to notice when REP #$20 is active, which complicates
> things a bit.

Why not just go to git.redump.net/mame, download the source code, edit the appropriate spot where that code goes, and commit it to source, then?

You can use git to do that.

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