INES Mapper 233: Difference between revisions
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(Created page with "Category:iNES Mappers Here are Disch's original notes: ======================== = Mapper 233 = ======================== Example Game: ----------…") |
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[[Category:iNES Mappers]] | [[Category:iNES Mappers|233]] | ||
Here are Disch's original notes: | Here are Disch's original notes: | ||
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Latest revision as of 08:34, 28 September 2012
Here are Disch's original notes: ======================== = Mapper 233 = ======================== Example Game: -------------------------- ???? "42-in-1" ???? Notes: --------------------------- Sources report this mapper as "42-in-1" with description layed out below. I did not test this, since I could not find a copy of the ROM in question. The only ROM I have that's marked as 233 is "Unknown Multicart 1", and it does *not* follow the description in this doc at all. There is a "Super 42-in-1"... but that is mapper 226. 226, by the way, is strikingly similar to the below description. I wonder if below description really applies to 233? Registers: --------------------------- $8000-FFFF: [MMOP PPPP] M = Mirroring O = PRG Mode P = PRG Page PRG Setup: --------------------------- $8000 $A000 $C000 $E000 +-------------------------------+ PRG Mode 0: | <$8000> | +-------------------------------+ PRG Mode 1: | $8000 | $8000 | +---------------+---------------+ Mirroring: --------------------------- 'M' mirroring bits: %00 = See below %01 = Vert %10 = Horz %11 = 1ScB Mode %00 (almost, but not quite 1ScA): [ NTA ][ NTA ] [ NTA ][ NTB ] ----------------------------------------------- -------------------------- "Unknown Multi Cart 1" -------------------------- ----------------------------------------------- Notes: -------------------------- This ROM is a mystery. It consists of 32 individual mapper 0 games, each 16k PRG + 8k CHR. Games do not use compatible mirroring modes -- the ROM includes Ice Climber (which uses H mirroring) and Excitebike (V mirroring). No games seem to be modified to make any kind of writes to $8000-FFFF, so I didn't find any clue as to what mapper registers are being written to (if any). There does not appear to be *ANY* game selection screen for the multicart. I have paged through every 16k of PRG and they all run the individual games straight up. So unless the mapper aligns to 8k (or smaller) pages on startup and there's some crap hidden in there, I don't see how these games are held together. Could it be that this ROM dump is bad or incomplete? The *only* other thing I can think of is that this cart might be reset based (a la mapper 060) -- but that is complicated by the fact that games use conflicting mirroring modes. So perhaps the mapper sets the mirroring mode based on what game is selected? More weirdness: games seem to have mismatching PRG/CHR pages. Ice Climber's PRG is on page $1F, but its CHR is on page $17. It seems that you need to subtract 8 from the PRG page to get the matching CHR page (and wrap where appropriate) Even more weirdness: despite each game only having 16k PRG, some of the games in the package normally have 32k! I don't know if the games were just hacked and had a bunch of stuff removed for what. It's possible this ROM dump is bogus and/or bad. It might even be assigned the wrong mapper number. At any rate... here are the games. Game name PRG page CHR Page Mirroring ---------------------------------------------------------- Galaxian $00 $18 Horz 10 Yard Fight $01 $19 Horz DKJ Math $02 $1A Vert Antarctic Adventure $03 $1B Horz Balloon Fight $04 $1C Horz Baseball $05 $1D Horz Battle City $06 $1E Horz Binary Land $07 $1F Horz Burger Time $08 $00 Horz Chack 'n Pop $09 $01 Horz Clu Clu Land $0A $02 Horz Lode Runner $0B $03 Vert ?? Go / Othello ?? $0C $04 ???? Field Combat $0D $05 Horz ** really 32k PRG? ** Devil World $0E $06 Horz Dig Dug $0F $07 Horz Donkey Kong $10 $08 Horz Donkey Kong Jr. $11 $09 Horz Donkey Kong 3 $12 $0A Vert Door Door $13 $0B Vert Duck Hunt $14 $0C Vert Excitebike $15 $0D Vert Exerion $16 $0E Horz F1-Race $17 $0F Vert Formation Z $18 $10 Horz Front Line $19 $11 Horz Galaga $1A $12 Horz ** really 32k PRG? ** Golf $1B $13 Vert Hogan's Alley $1C $14 Vert Hyper Olympic $1D $15 Vert ?? some gun game ?? $1E $16 ???? Ice Climber $1F $17 Horz