INES Mapper 080: Difference between revisions
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m (control registers possibly mirrored?) |
(mapper with built-in battery RAM sounds very MMC6 to me) |
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[[Category:iNES Mappers|080]][[Category:in NesCartDB|080]][[Category:MMC3-like mappers|080]] | [[Category:iNES Mappers|080]][[Category:in NesCartDB|080]][[Category:MMC3-like mappers|080]] | ||
[[iNES Mapper 080]] represents most boards using [[Taito X1-005 pinout|Taito's X1-005 mapper IC]], which provides something somewhere between the [[ | [[iNES Mapper 080]] represents most boards using [[Taito X1-005 pinout|Taito's X1-005 mapper IC]], which provides something somewhere between the [[MMC6]] and the [[iNES Mapper 206|Namcot 108]] in sophistication. | ||
In comparison to to the Namcot 108, it: | In comparison to to the Namcot 108, it: | ||
| Line 7: | Line 7: | ||
* has 128 extra bytes of RAM, optionally battery-backed | * has 128 extra bytes of RAM, optionally battery-backed | ||
In comparison to the | In comparison to the MMC6, it | ||
* has the ability to bankswitch three different 8 KiB slices of PRG ROM simultaneously | * has the ability to bankswitch three different 8 KiB slices of PRG ROM simultaneously | ||
* does not have an IRQ | * does not have an IRQ | ||
* cannot swap which pattern table is 2×2KiB and which is 4×1KiB | * cannot swap which pattern table is 2×2KiB and which is 4×1KiB | ||
* has 128 extra bytes of RAM | * has only 128 extra bytes of RAM | ||
If the pinout is correct, CPU A7 is ignored and the control registers should also be present at $7E7x. | If the pinout is correct, CPU A7 is ignored and the control registers should also be present at $7E7x. | ||
Revision as of 16:29, 17 August 2013
iNES Mapper 080 represents most boards using Taito's X1-005 mapper IC, which provides something somewhere between the MMC6 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 MMC6, it
- has the ability to bankswitch three different 8 KiB slices of PRG ROM simultaneously
- does not have an IRQ
- cannot swap which pattern table is 2×2KiB and which is 4×1KiB
- has only 128 extra bytes of RAM
If the pinout is correct, CPU A7 is ignored and the control registers should also be present at $7E7x.
See also: Taito X1-017, Taito X1-005 with alternate mirroring control, BootGod's forum post
======================== = 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} | +-------+-------+-------+-------+
