NES 2.0 Mapper 281: Difference between revisions

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(Created page with "Category:Multicart mappers NES 2.0 Mapper 281 is used for the ''1997 Super HIK 4-in-1 multicart'' (JY-052) by J.Y. Company, which has 512 KiB each of PRG-ROM and CHR-ROM....")
 
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[[Category:Multicart mappers]]
{{DEFAULTSORT:281}}[[Category:Mappers with ROM nametables]][[Category:Mappers with scanline IRQs]][[Category:Mappers with cycle IRQs]][[Category:Multicart mappers]][[Category:Mappers using J.Y. Company ASIC]]
NES 2.0 Mapper 281 is used for the ''1997 Super HIK 4-in-1 multicart'' (JY-052) by J.Y. Company, which has 512 KiB each of PRG-ROM and CHR-ROM. A single bit in register $D003 selects both PRG and CHR outer banks, and extended nametable mirroring is selected via bit 3 of $D001. It is otherwise similar to [[INES Mapper 090|Mapper 90]].
'''NES 2.0 Mapper 281''' denotes a number of compatible circuit boards from J.Y. Company:
* 512 KiB PRG-ROM, 512 KiB CHR-ROM: '''YY841144C''', '''YY850771C''', '''YY851115C''', '''YY860416C''', '''YY860417C''', '''YY860731C'''
* 1 MiB PRG-ROM, 1 MiB CHR-ROM: '''YY850719C'''
and is used for the following multicarts:
* ''1996 Super HiK 4-in-1 (JY-052)''
* ''1997 Super HiK 4-in-1 (JY-052)''
* ''1996 Super HiK 4-in-1 (JY-053)''
* ''1996 Super HiK 4-in-1 (JY-054)''
* ''1997 Super HiK 4-in-1 (JY-054)''
* ''1996 Super HiK 4-in-1 (JY-055)''
* ''1996 Power Rangers HiK 4-in-1 (JY-066)''
* ''1997 Power Rangers HiK 4-in-1 (JY-066)''
* ''1996 Super HiK 3-in-1 (JY-068)''
* ''1996 Super HiK 3-in-1 (JY-080)''
* ''1996 Super HiK 5-in-1 (JY-088)''
It uses the [[J.Y. Company ASIC]].


=Registers=
==Outer Bank Register ($D003)==
$8000-$D000, $D002: As [[INES Mapper 090|Mapper 90]].
 
==Nametable Mirroring Control Register ($D001)==
Mask: $F003
Mask: $F003
  7654 3210
  7654 3210
  ---- ----
  ---- ----
  .... E.MM
  .... ..BB
      | ++- Select nametable mirroring if bit 3==0
        ++- PRG/CHR A18/A19 (256 KiB outer PRG/CHR-ROM bank)
      |    0: Vertical
 
      |    1: Horizontal
PRG ($8000-$8FFF) and CHR ($9000-$AFFF) bank select register bits that select 256 KiB banks are masked off.
      |    2: One-screen page 0
      |    3: One-screen page 1
      +---- Select extended nametable mirroring
            0: Disabled, use $D001 bits 0-1
            1: Enabled, use $B000-$B007


==Outer Bank Register ($D003)==
For a description of all other registers, see [[J.Y. Company ASIC]].
Mask: $F003
7654 3210
---- ----
.... ...C
        +- Select 256 KiB outer PRG-ROM bank
        +- Select 256 KiB outer CHR-ROM bank
=Notes=
* PRG ($8000-$8FFF) and CHR ($9000-$AFFF) bank select register bits that select 256 KiB banks are masked off.

Latest revision as of 00:19, 8 December 2021

NES 2.0 Mapper 281 denotes a number of compatible circuit boards from J.Y. Company:

  • 512 KiB PRG-ROM, 512 KiB CHR-ROM: YY841144C, YY850771C, YY851115C, YY860416C, YY860417C, YY860731C
  • 1 MiB PRG-ROM, 1 MiB CHR-ROM: YY850719C

and is used for the following multicarts:

  • 1996 Super HiK 4-in-1 (JY-052)
  • 1997 Super HiK 4-in-1 (JY-052)
  • 1996 Super HiK 4-in-1 (JY-053)
  • 1996 Super HiK 4-in-1 (JY-054)
  • 1997 Super HiK 4-in-1 (JY-054)
  • 1996 Super HiK 4-in-1 (JY-055)
  • 1996 Power Rangers HiK 4-in-1 (JY-066)
  • 1997 Power Rangers HiK 4-in-1 (JY-066)
  • 1996 Super HiK 3-in-1 (JY-068)
  • 1996 Super HiK 3-in-1 (JY-080)
  • 1996 Super HiK 5-in-1 (JY-088)

It uses the J.Y. Company ASIC.

Outer Bank Register ($D003)

Mask: $F003 

7654 3210
---- ----
.... ..BB
       ++- PRG/CHR A18/A19 (256 KiB outer PRG/CHR-ROM bank)

PRG ($8000-$8FFF) and CHR ($9000-$AFFF) bank select register bits that select 256 KiB banks are masked off.

For a description of all other registers, see J.Y. Company ASIC.

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