INES Mapper 063
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iNES Mapper 063 is used for NTDEC's "Powerful 250-in-1" multicart (PCB ID TH2291-3) and its pirate-of-a-pirate equivalent, the "Hello Kitty 255-in-1" (PCB ID CH-011) multicart (Submapper 0), as well as the 82AB PCB used by a 82-in-1 multicart (Submapper 1). The address-latch-based bankswitching hardware supports only NROM-128 and NROM-256 games. CHR data is stored in 8 KiB of unbanked CHR-RAM that can be write-protected.
Address latch ($8000-$FFFF, write)
Submapper 0:
A~FEDC BA98 7654 3210
-------------------
1... .CBB BBBB BbPM
||| |||| |||+- Select nametable mirroring type
||| |||| ||| 0: Vertical
||| |||| ||| 1: Horizontal
||| |||| ||+-- Select PRG banking mode
||| |||| || 0: NROM-128, CPU A14 replaced with b
||| |||| || 1: NROM-256, CPU A14 unmodified
|++-++++-++--- Select 16 KiB PRG-ROM bank (A14..A21)
+------------- Select CHR-RAM write-protection
0: Disabled, CHR-RAM writable
1: Enabled, CHR-RAM write-protected
For the menu code to correctly detect the number of games, selecting unpopulated PRG-ROM banks must result in open bus rather than wrapped addresses.
Submapper 1:
A~FEDC BA98 7654 3210
-------------------
1... ..CB BBBB BbPM
|| |||| |||+- Select nametable mirroring type
|| |||| ||| 0: Vertical
|| |||| ||| 1: Horizontal
|| |||| ||+-- Select PRG banking mode
|| |||| || 0: NROM-128, CPU A14 replaced with b
|| |||| || 1: NROM-256, CPU A14 unmodified
|+-++++-++--- Select 16 KiB PRG-ROM bank (A14..A21)
+------------ Select CHR-RAM write-protection
0: Disabled, CHR-RAM writable
1: Enabled, CHR-RAM write-protected
Compared to Submapper 0, Submapper 1 can be thought as having one PRG-ROM bit less, and moving the CHR-RAM Protect bit into its place.
