INES Mapper 184: Difference between revisions
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[[Category:iNES Mappers]] | [[Category:iNES Mappers|184]][[Category:Discrete logic mappers|184]][[Category:in NesCartDB|184]] | ||
This is part of a family of Sunsoft mappers used largely by Japanese games: ([[iNES Mapper 089]], [[iNES Mapper 093]], [[iNES Mapper 184]]) | |||
This mapper is for a few games which use the [[Sunsoft 1 pinout|Sunsoft-1 mapper]]. | |||
Fantasy Zone (J), despite using the Sunsoft-1 chip, is more easily emulated by [[iNES Mapper 093|Mapper 093]] because it was written to support execution using either the Sunsoft-2 IC and a variant board that used the Sunsoft-1 IC. | |||
Despite the mapper existing as a single IC, its functionality is describable using a [[74139]], a [[74174]], and a [[74157]], and so should probably be considered discrete logic. | |||
Here is the documentation in [[INES_Mapper_DischDocs|disch's original style]]: | |||
Registers: | Registers: | ||
-------------------------- | -------------------------- | ||
| Line 18: | Line 16: | ||
L = Selects 4k CHR @ $0000 | L = Selects 4k CHR @ $0000 | ||
The most significant bit of H is always set in hardware. (i.e. its range is 4 to 7) | |||
(There can be no SRAM because the register is mapped into $6000-7FFF) | |||
fwNES, a NES emulator for DOS, originally assigned mapper '''122''' for this.<ref>FWNES98E.TXT, fwNES 0.302b, 1998/11/16, by FanWen Yang</ref> | |||
Latest revision as of 21:27, 27 May 2020
This is part of a family of Sunsoft mappers used largely by Japanese games: (iNES Mapper 089, iNES Mapper 093, iNES Mapper 184)
This mapper is for a few games which use the Sunsoft-1 mapper.
Fantasy Zone (J), despite using the Sunsoft-1 chip, is more easily emulated by Mapper 093 because it was written to support execution using either the Sunsoft-2 IC and a variant board that used the Sunsoft-1 IC.
Despite the mapper existing as a single IC, its functionality is describable using a 74139, a 74174, and a 74157, and so should probably be considered discrete logic.
Here is the documentation in disch's original style:
Registers:
--------------------------
$6000-7FFF: [.HHH .LLL]
H = Selects 4k CHR @ $1000
L = Selects 4k CHR @ $0000
The most significant bit of H is always set in hardware. (i.e. its range is 4 to 7)
(There can be no SRAM because the register is mapped into $6000-7FFF)
fwNES, a NES emulator for DOS, originally assigned mapper 122 for this.[1]
- ↑ FWNES98E.TXT, fwNES 0.302b, 1998/11/16, by FanWen Yang
