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....")
 
(Link to ASIC page, only describe mapper-specific register)
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[[Category:Multicart mappers]]
[[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. 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 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. It uses the [[J.Y. Company ASIC]]. A single bit in register $D003 selects both PRG and CHR outer banks.
 
=Registers=
$8000-$D000, $D002: As [[INES Mapper 090|Mapper 90]].
 
==Nametable Mirroring Control Register ($D001)==
Mask: $F003
 
7654 3210
---- ----
.... E.MM
      | ++- Select nametable mirroring if bit 3==0
      |    0: Vertical
      |    1: Horizontal
      |    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 ($D003)==
==Outer Bank Register ($D003)==
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         +- Select 256 KiB outer PRG-ROM bank
         +- Select 256 KiB outer PRG-ROM bank
         +- Select 256 KiB outer CHR-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.
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]].
{{DEFAULTSORT:281}}[[Category:INES Mappers|281]][[Category:Mappers with ROM nametables|281]][[Category:Mappers with scanline IRQs|281]][[Category:Mappers with cycle IRQs|281]]

Revision as of 15:56, 3 October 2018

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. It uses the J.Y. Company ASIC. A single bit in register $D003 selects both PRG and CHR outer banks.

Outer Bank Register ($D003)

Mask: $F003 

7654 3210
---- ----
.... ...C
        +- Select 256 KiB outer PRG-ROM bank
        +- Select 256 KiB outer 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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