INES Mapper 080: Difference between revisions
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(Created page with "Category:iNES Mappers Here are Disch's original notes: ======================== = Mapper 080 = ======================== Example Games: ---------…") |
m (I guess I've persuaded myself that Taito's X1 mappers are MMC3-like. Refile & add categories.) |
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[[Category:iNES Mappers]] | [[Category:iNES Mappers|080]][[Category:in NesCartDB|080]][[Category:MMC3-like mappers|080]] | ||
[[iNES Mapper 080]] represents most boards using Taito's X1-005 mapper IC, which provides something somewhere between the [[MMC3]] and the [[iNES Mapper 206|Namcot 108]] in sophistication. | |||
In comparison to to the Namcot 108, it: | |||
* has the ability to bankswitch ROM from $C000-$DFFF | |||
* has mirroring control | |||
* has 128 extra bytes of RAM, optionally battery-backed | |||
In comparison to the MMC3, it | |||
* has the ability to bankswitch three different 8 KiB slices of ROM simultaneously | |||
* does not have an IRQ | |||
* cannot swap which pattern table is 2x2KiB and which is 4x1KiB | |||
* cannot select 1-screen mirroring | |||
* has 128 extra bytes of RAM, optionally battery-backed | |||
======================== | ======================== | ||
= Mapper 080 = | = Mapper 080 = | ||
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Notes: | Notes: | ||
--------------------------- | --------------------------- | ||
Regs appear at $7EFx, I'm unsure whether or not PRG-RAM can exist at $6000- | Regs appear at $7EFx, I'm unsure whether or not PRG-RAM can exist at $6000-7EFF | ||
Fudou Myouou Den is often marked to use this mapper -- however it uses mapper 207. | Fudou Myouou Den is often marked to use this mapper -- however it uses [[iNES Mapper 207|mapper 207]]. | ||
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$7EF0-7EF5: CHR Regs | $7EF0-7EF5: CHR Regs | ||
$7EF6: [.... ...M] Mirroring | $7EF6,7EF7: [.... ...M] Mirroring | ||
0 = Horz | 0 = Horz | ||
1 = Vert | 1 = Vert | ||
$7EF8,7EF9: Internal RAM permission ($A3 enables reads/writes; any other value disables) | |||
$7EFA,7EFB: PRG Reg 0 (8k @ $8000) | $7EFA,7EFB: PRG Reg 0 (8k @ $8000) | ||
$7EFC,7EFD: PRG Reg 1 (8k @ $A000) | $7EFC,7EFD: PRG Reg 1 (8k @ $A000) | ||
$7EFE,7EFF: PRG Reg 2 (8k @ $C000) | $7EFE,7EFF: PRG Reg 2 (8k @ $C000) | ||
$7F00-7FFF: 128 Bytes of RAM, mirrored once. | |||
Revision as of 06:07, 3 August 2012
iNES Mapper 080 represents most boards using Taito's X1-005 mapper IC, which provides something somewhere between the MMC3 and the Namcot 108 in sophistication.
In comparison to to the Namcot 108, it:
- has the ability to bankswitch ROM from $C000-$DFFF
- has mirroring control
- has 128 extra bytes of RAM, optionally battery-backed
In comparison to the MMC3, it
- has the ability to bankswitch three different 8 KiB slices of ROM simultaneously
- does not have an IRQ
- cannot swap which pattern table is 2x2KiB and which is 4x1KiB
- cannot select 1-screen mirroring
- has 128 extra bytes of RAM, optionally battery-backed
======================== = Mapper 080 = ======================== Example Games: -------------------------- Kyonshiizu 2 Minelvaton Saga Taito Grand Prix - Eikou heno License Notes: --------------------------- Regs appear at $7EFx, I'm unsure whether or not PRG-RAM can exist at $6000-7EFF Fudou Myouou Den is often marked to use this mapper -- however it uses mapper 207. Registers: --------------------------- $7EF0-7EF5: CHR Regs $7EF6,7EF7: [.... ...M] Mirroring 0 = Horz 1 = Vert $7EF8,7EF9: Internal RAM permission ($A3 enables reads/writes; any other value disables) $7EFA,7EFB: PRG Reg 0 (8k @ $8000) $7EFC,7EFD: PRG Reg 1 (8k @ $A000) $7EFE,7EFF: PRG Reg 2 (8k @ $C000) $7F00-7FFF: 128 Bytes of RAM, mirrored once. CHR Setup: --------------------------- $0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00 +---------------+---------------+-------+-------+-------+-------+ | <$7EF0> | <$7EF1> | $7EF2 | $7EF3 | $7EF4 | $7EF5 | +---------------+---------------+-------+-------+-------+-------+ PRG Setup: --------------------------- $8000 $A000 $C000 $E000 +-------+-------+-------+-------+ | $7EFA | $7EFC | $7EFE | { -1} | +-------+-------+-------+-------+
