NES 2.0 Mapper 295: Difference between revisions

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* ''1997 Super 13-in-1 (JY-110)''
* ''1997 Super 13-in-1 (JY-110)''


Its UNIF board name is '''BMC-13in1JY110''', although FCEUX' support is non-working.
Its UNIF board name is '''BMC-13in1JY110''', although FCEUX' support is non-working. It uses the [[J.Y. Company ASIC]].  


The same bits in register $D003 select both PRG and CHR outer banks, and extended nametable mirroring is selected via bit 3 of $D001. It is almost identical to [[NES 2.0 Mapper 281]], except that the outer bank size is 128 KiB rather than 256 KiB.
The same bits in register $D003 select both PRG and CHR outer banks. It is almost identical to [[NES 2.0 Mapper 281]], except that the outer bank size is 128 KiB rather than 256 KiB.
 
=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)==
Mask: $F003
Mask: $F003
  7654 3210
  7654 3210
  ---- ----
  ---- ----
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       +++- Select 128 KiB outer PRG-ROM bank
       +++- Select 128 KiB outer PRG-ROM bank
       +++- Select 128 KiB outer CHR-ROM bank
       +++- Select 128 KiB outer CHR-ROM bank
=Notes=
PRG ($8000-$8FFF) and CHR ($9000-$AFFF) bank select register bits that select 128/256 KiB banks are masked off.  
* PRG ($8000-$8FFF) and CHR ($9000-$AFFF) bank select register bits that select 128 KiB banks are masked off.
 
* JY-109 and JY-110 use 8 KiB of unbanked CHR-RAM rather than CHR-ROM. Simply assume CHR-RAM if no CHR-ROM banks are present in the ROM image.
For a description of all other registers, see [[J.Y. Company ASIC]].
 
{{DEFAULTSORT:295}}[[Category:INES Mappers|295]][[Category:Mappers with ROM nametables|295]][[Category:Mappers with scanline IRQs|295]][[Category:Mappers with cycle IRQs|295]][[Category:Mappers using J.Y. Company ASIC]]

Latest revision as of 00:20, 8 December 2021

NES 2.0 Mapper 295 is used for several multicarts from J.Y. Company:

  • 1996 Soccer 7-in-1 (JY-014B)
  • 1997 Super HIK 4-in-1 (JY-095)
  • 1997 Super HIK 7-in-1 (JY-096)
  • 1997 Super HIK 4-in-1 (JY-099)
  • 1997 Super 9-in-1 (JY-109)
  • 1997 Super 13-in-1 (JY-110)

Its UNIF board name is BMC-13in1JY110, although FCEUX' support is non-working. It uses the J.Y. Company ASIC.

The same bits in register $D003 select both PRG and CHR outer banks. It is almost identical to NES 2.0 Mapper 281, except that the outer bank size is 128 KiB rather than 256 KiB.

Outer Bank Register ($D003)

Mask: $F003

7654 3210
---- ----
.... .CCC
      +++- Select 128 KiB outer PRG-ROM bank
      +++- Select 128 KiB outer CHR-ROM bank

PRG ($8000-$8FFF) and CHR ($9000-$AFFF) bank select register bits that select 128/256 KiB banks are masked off.

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

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