Add support for iNES Mapper 003, which is a very simple mapper
only swiching out CHR chunks.
There is 16kB of fixed space mapped from $C000-FFFF and,
optionally 16kB more of fixed space from $8000-$BFFF (if not,
this area is mirrored)
The CHR ROM from $0000-$1FFF is banked in 8k chunks, up to four.
Some games look for bus contention, it is not implemented.
Add support for iNES Mapper 002, which is a simpler version of Mapper 1.
There is 16kB of fixed space mapped from $C000-FFFF and 16kB of mappable
space from $8000-$BFFF. This space is mapped simply by writing to
0x8000. There is 8K of CHR ROM, and no RAM or anything funny.
