INES Mapper 154

iNES Mapper 154 represents NAMCOT-3453, a board used only for the game Devil Man.

It is identical to Mapper 88, except with the addition of a single bit allowing for mapper-controlled one-screen mirroring:

 $8000-$FFFF: [.Mxx xxxx]
   x = See mapper 206 documentation
   M = Mirroring
     0 = 1ScA
     1 = 1ScB

Note that this bit is present over the entire 32kB range; it is not present in only odd or even addresses unlike the associated Namcot 108.

Like mapper 88, content in the left pattern table ($0xxx) comes from the first 64kB of CHR-ROM and content in the right pattern table ($1xxx) comes from the last 64kB of CHR-ROM.