NES 2.0 Mapper 388
NES 2.0 Mapper 388 denotes J.Y. Company's YY841145C and YY850835C circuit boards, used for the multicarts:
- 1996 Super HiK 4-in-1 (JY-056 earlier version)
- 1996 Super HiK 5-in-1 (JY-056 later version)
It uses the J.Y. Company ASIC, has 1 MiB of PRG-ROM and CHR-ROM each, and is similar to NES 2.0 Mapper 386 but has the Outer Bank register bits in a different order. This particular PCB inhibits ROM nametables and Extended Mirroring that would otherwise be enabled via register, similar to INES Mapper 090.
Outer Bank Register ($D003)
Mask: $F003 7654 3210 ---- ---- ..L. PpCc | |||+- CHR A18, ignored if L=1 | ||+-- CHR A19 | |+--- PRG A18 | +---- PRG A19 +------- Select outer CHR-ROM bank size 0: Mask $900x/$A00x to 256 KiB, use c 1: Mask $900x/$A00x to 512 KiB, ignore c
For a description of all other registers, see J.Y. Company ASIC.