NES 2.0 Mapper 282

NES 2.0 Mapper 282 is used by at least three J.Y. multicarts:

• 1997 Super HIK 18-in-1 (JY-101)
• 1997 Super HIK 21-in-1 (JY-105)
• 1998 Super HIK 5-in-1 (JY-114)

Each of them have 1 MiB each of PRG-ROM and CHR-ROM. Register $D003 controls 256 KiB outer banks, and extended nametable mirroring is selected via bit 3 of $D001. It is otherwise similar to Mapper 90.

Registers

$8000-$D000, $D002: As 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)

Mask: $F003

7654 3210
---- ----
.... CPPC
     |||+- Select 256 KiB outer CHR-ROM bank
     |++-- Select 256/512 KiB outer PRG-ROM bank
     +---- Select 512 KiB outer CHR-ROM bank

Notes

• PRG ($8000-$8FFF) and CHR ($9000-$AFFF) bank select register bits that select 256/512 KiB banks are masked off.