INES Mapper 219
iNES Mapper 219 is used for the 卡聖 (Kǎshèng) A9461 MMC3-clone-bearing board, used by:
- Toy Story
- Super 1997 4-in-1
Mode Register ($8002)
Mask: $E003 7654 3210 --------- CPMR RRRR ||++-++++-*Select bank register number (0-7 in MMC3 mode, $08-$26 in Extended mode) ||+------- Select mode || 0: MMC3 mode || 1: Extended mode |+--------*1: PRG A14 inversion in MMC3 mode +---------*1: CHR A12 inversion in MMC3 mode * Same as $8000
MMC3 mode registers ($8000-$FFFF)
Mask: $E001 $A000, $A001, $C000, $C001, $E000, $E001: As on regular MMC3.
MMC3 Bank Register Index ($8000)/Data ($8001)
Mask: $E001. Used only if $8002 bit 5=0, see MMC3. Note that PRG-ROM and CHR-ROM banks are masked to 128 KiB.
Extended PRG-ROM Bank Index ($8000, $23-$26)/Data ($8001)
Mask: $E001. Used only if $8002 bit 5=1.
$8000/$8002 value:
D~7654 3210
---------
..10 .RRR
+++- 6: Select 8 KiB PRG-ROM bank at CPU $8000-$9FFF
5: Select 8 KiB PRG-ROM bank at CPU $A000-$BFFF
4: Select 8 KiB PRG-ROM bank at CPU $C000-$DFFF
3: Select 8 KiB PRG-ROM bank at CPU $E000-$FFFF
$8001 value:
D~7654 3210
---------
..BB BB..
++-++--- Bits 0-3 (reversed order) of 8 KiB PRG-ROM bank number
CHR-ROM Bank Number Latch Index ($8000, $08-$1E, even)/Data ($8001)
Mask: $E001. Used only if $8002 bit 5=1.
$8000 value:
D~7654 3210 --------- ..00 1..0 or D~7654 3210 --------- ..01 ...0
$8001 value:
D~7654 3210
---------
.... .654
+++- Bits 4-6 OR'd with next CHR-ROM switch's data
CHR-ROM Pseudo 2 KiB switch Index ($8000, $09-$0F, odd)/Data ($8001)
Mask: $E001. Used only if $8002 bit 5=1.
$8000 value:
D~7654 3210
---------
..00 1RR1
++-- Select CHR-ROM address range to switch
| 0: PPU $0000-$03FF
| 1: PPU $0400-$07FF
| 2: PPU $0800-$0BFF
| 3: PPU $0C00-$0FFF
+-- OR'd with Bit 0 of CHR-ROM bank data
$8001 value:
D~7654 3210 --------- BBBB BBB. ++++-+++-- Bits 0-6 of 1 KiB CHR-ROM bank number at PPU address selected via $8000/$8002.
The value is OR'd with bit 1 SHR 1 of the value written to $8000, then OR'd with bits 0-2 SHL 4 of the value written to the CHR-ROM latch.
CHR-ROM 1 KiB switch Index ($8000, $11-$1F, odd)/Data ($8001)
Mask: $E001. Used only if $8002 bit 5=1.
$8000 value:
D~7654 3210
---------
..01 RR.1
++--- Select CHR-ROM address range to switch
0: PPU $1000-$13FF
1: PPU $1400-$17FF
2: PPU $1800-$1BFF
3: PPU $1C00-$1FFF
$8001 value:
D~7654 3210 --------- BBBB BBB. ++++-+++-- Bits 0-6 of 1 KiB CHR-ROM bank number at PPU address selected via $8000/$8002.
The value is OR'd with bits 0-2 SHL 4 of the value written to the CHR-ROM latch.
Outer Bank Bit 0 ($5002)
Mask: $5003
D~7654 3210
---------
.... ...B
+- Bit 0 of 128 KiB outer PRG-ROM and CHR-ROM bank
Outer Bank Bit 1 ($5003)
Mask: $5003
D~7654 3210
---------
..B. ....
+------- Bit 1 of 128 KiB outer PRG-ROM and CHR-ROM bank
The Outer Bank register must be initialized to $03 for the menu to appear.
