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 Post subject: Submapper for MMC3A
PostPosted: Sat Jan 20, 2018 12:04 pm 
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Joined: Thu May 19, 2005 11:30 am
Posts: 508
The Submapper page states:
Quote:
MMC3A: IRQ is asserted on A12 rise, and loading the latch with 0 disables IRQ. Some chips labeled MMC3B also have this "old style" behavior. No games are known to rely on this behavior.
I know one: The Mapper 4 version of SuperGame's Aladdin, headerless CRC32 0x97B6CB19, named "Aladdin (SuperGame) (Mapper 4) [!]" in GoodNes 3.23b. The game writes 0 to $C000 but also to $E001. MMC3A behavior runs the game normally, MMC3C behavior makes it freeze after the title screen.

Can we allocate submapper 4 to mapper 4 for that? There already is a test ROM for that in the form of Blargg's mmc3_test, single rom "6-MMC3_alt.nes".


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 Post subject: Re: Submapper for MMC3A
PostPosted: Sat Jan 20, 2018 12:32 pm 
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Joined: Sun Apr 13, 2008 11:12 am
Posts: 7036
Location: Seattle
You have my approval, for whatever that's worth.


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 Post subject: Re: Submapper for MMC3A
PostPosted: Tue Jan 23, 2018 1:41 pm 
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Joined: Thu May 19, 2005 11:30 am
Posts: 508
I have added it to the submapper page.


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