INES Mapper 184: Difference between revisions

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m (Be precise about "board" vs "chip"/"IC" — the Sunsoft-1 IC was used on the Sunsoft-(K/4) boards, while the Sunsoft-2 IC was used on the Sunsoft-(3/3R) boards.)
(Add fwNES note)
 
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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 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 chip.
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.
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]]:
Here is the documentation in [[INES_Mapper_DischDocs|disch's original style]]:
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   The most significant bit of H is always set in hardware. (i.e. its range is 4 to 7)
   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)
   (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]

  1. FWNES98E.TXT, fwNES 0.302b, 1998/11/16, by FanWen Yang