NES 2.0 Mapper 293
NES 2.0 Mapper 293 is used for the NewStar 12-in-1 and 76-in-1 multicarts. Both use 8 KiB of unbanked CHR-RAM rather than CHR-ROM.
Mask: $A000
7654 3210
---------
.... PIII
|+++- Select inner 16 KiB PRG-ROM bank
+---- Bit 1 of the PRG banking mode number
Mask: $C000
7654 3210
---------
MP10 ...2
||++----+- Select outer 128 KiB PRG-ROM bank (note the bit distribution)
|+-------- Bit 0 of the PRG banking mode number
+--------- Select nametable mirroring type
0: Vertical
1: Horizontal
- 0 (UNROM)
$8000-$BFFF: Switchable 16 KiB Inner PRG-ROM bank
$C000-$FFFF: Fixed 16 KiB Inner PRG-ROM bank #7
- 1
$8000-$BFFF: Switchable 16 KiB Inner PRG-ROM bank AND $FE
$C000-$FFFF: Fixed 16 KiB Inner PRG-ROM bank #7
- 2 (NROM-128)
$8000-$BFFF: Switchable 16 KiB Inner PRG-ROM bank
$C000-$FFFF: Mirror of $8000-$BFFF
- 3 (NROM-256)
$8000-$FFFF: Switchable 32 KiB Inner PRG-ROM bank (bit 0 of inner bank number ignored)
- The address ranges of the two banking registers do indeed partially overlap.
- Nestopia Plus! assigns this board to Mapper 281 instead.