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| [[Category:ASIC mappers]] | | #REDIRECT [[INES Mapper 019]] |
| The '''Namco 106''' and '''Namco 163''' are [[:Category:ASIC mappers|ASIC]] [[MMC|mappers]], assigned to [[INES_Mapper_019 | iNES mapper 19]]. A variant of this mapper with hardwired mirroring is assigned to [[INES_Mapper_210 | iNES mapper 210]].
| | [[Category:Mappers with CHR ROM and CHR RAM]][[Category:Mappers using $4020-$5FFF]][[Category:ASIC mappers]][[Category:Mappers with ROM nametables]][[Category:Mappers with cycle IRQs]][[Category:Mappers with single-screen mirroring]] |
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| == Overview ==
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| * PRG ROM size: Up to 512 KB
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| * PRG ROM bank size: 8 KB
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| * PRG RAM: Up to 8 KB
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| * CHR capacity: Up to 256 KB ROM and/or 32 KB RAM simultaneously [[Category:Mappers with CHR RAM]]
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| * CHR bank size: 1 KB
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| * Nametable [[mirroring]]: Controlled by mapper (Mapper 19), hardwired (Mapper 210)
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| * Subject to [[bus conflict]]s: No
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| == Banks ==
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| * CPU $6000-$7FFF: 8 KB PRG RAM bank
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| * CPU $8000-$9FFF: 8 KB switchable PRG ROM bank
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| * CPU $A000-$BFFF: 8 KB switchable PRG ROM bank
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| * CPU $C000-$DFFF: 8 KB switchable PRG ROM bank
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| * CPU $E000-$FFFF: 8 KB PRG ROM bank, fixed to the last bank
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| * PPU $0000-$03FF: 1 KB switchable CHR bank
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| * PPU $0400-$07FF: 1 KB switchable CHR bank
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| * PPU $0800-$0BFF: 1 KB switchable CHR bank
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| * PPU $0C00-$0FFF: 1 KB switchable CHR bank
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| * PPU $1000-$13FF: 1 KB switchable CHR bank
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| * PPU $1400-$17FF: 1 KB switchable CHR bank
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| * PPU $1800-$1BFF: 1 KB switchable CHR bank
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| * PPU $1C00-$1FFF: 1 KB switchable CHR bank
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| == Registers ==
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| The n106 has 19 registers within $4800-$FFFF, except $6000-$7FFF which is WRAM. Each register occupies a range of $800 bytes, so $4800-$4FFF all refers to one register, $5000-$57FF all refers to another register, and so on.
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| === Sound Data Port ($4800-$4FFF) r/w ===
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| See [[Namco 163 audio]].
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| === IRQ Counter (low) ($5000-$57FF) r/w ===
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| 7 bit 0
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| ---- ----
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| IIII IIII
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| |||| ||||
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| ++++-++++- Low 8 bits of IRQ counter
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| === IRQ Counter (high) / IRQ Enable ($5800-$5FFF) r/w ===
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| 7 bit 0
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| ---- ----
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| EIII IIII
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| |||| ||||
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| |+++-++++- High 7 bits of IRQ counter
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| +--------- IRQ Enable: (0: disabled; 1: enabled)
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| === CHR Select 1 ($8000-$87FF) w ===
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| 7 bit 0
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| ---- ----
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| CCCC CCCC
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| |||| ||||
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| ++++-++++- Select 1KB page of CHR-ROM or CHR-RAM at $0000
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| '''Note:''' Pages $E0-$FF are CHR-RAM, as long as $E800.6 is set to 0. If $E800.6 is set to 1, then pages $E0-$FF refer to the last $20 pages of CHR-ROM as you'd expect.
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| === CHR Select 2 ($8800-$88FF) w ===
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| 7 bit 0
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| ---- ----
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| CCCC CCCC
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| |||| ||||
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| ++++-++++- Select 1KB page of CHR-ROM or CHR-RAM at $0400
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| '''Note:''' Pages $E0-$FF are CHR-RAM, as long as $E800.6 is set to 0. If $E800.6 is set to 1, then pages $E0-$FF refer to the last $20 pages of CHR-ROM as you'd expect.
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| === CHR Select 3 ($9000-$97FF) w ===
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| 7 bit 0
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| ---- ----
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| CCCC CCCC
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| |||| ||||
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| ++++-++++- Select 1KB page of CHR-ROM or CHR-RAM at $0800
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| '''Note:''' Pages $E0-$FF are CHR-RAM, as long as $E800.6 is set to 0. If $E800.6 is set to 1, then pages $E0-$FF refer to the last $20 pages of CHR-ROM as you'd expect.
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| === CHR Select 4 ($9800-$9FFF) w ===
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| 7 bit 0
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| ---- ----
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| CCCC CCCC
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| |||| ||||
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| ++++-++++- Select 1KB page of CHR-ROM or CHR-RAM at $0C00
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| '''Note:''' Pages $E0-$FF are CHR-RAM, as long as $E800.6 is set to 0. If $E800.6 is set to 1, then pages $E0-$FF refer to the last $20 pages of CHR-ROM as you'd expect.
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| === CHR Select 5 ($A000-$A7FF) w ===
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| 7 bit 0
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| ---- ----
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| CCCC CCCC
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| |||| ||||
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| ++++-++++- Select 1KB page of CHR-ROM or CHR-RAM at $1000
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| '''Note:''' Pages $E0-$FF are CHR-RAM, as long as $E800.7 is set to 0. If $E800.7 is set to 1, then pages $E0-$FF refer to the last $20 pages of CHR-ROM as you'd expect.
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| === CHR Select 6 ($A800-$AFFF) w ===
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| 7 bit 0
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| ---- ----
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| CCCC CCCC
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| |||| ||||
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| ++++-++++- Select 1KB page of CHR-ROM or CHR-RAM at $1400
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| '''Note:''' Pages $E0-$FF are CHR-RAM, as long as $E800.7 is set to 0. If $E800.7 is set to 1, then pages $E0-$FF refer to the last $20 pages of CHR-ROM as you'd expect.
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| === CHR Select 7 ($B000-$B7FF) w ===
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| 7 bit 0
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| ---- ----
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| CCCC CCCC
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| |||| ||||
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| ++++-++++- Select 1KB page of CHR-ROM or CHR-RAM at $1800
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| '''Note:''' Pages $E0-$FF are CHR-RAM, as long as $E800.7 is set to 0. If $E800.7 is set to 1, then pages $E0-$FF refer to the last $20 pages of CHR-ROM as you'd expect.
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| === CHR Select 8 ($B800-$BFFF) w ===
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| 7 bit 0
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| ---- ----
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| CCCC CCCC
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| |||| ||||
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| ++++-++++- Select 1KB page of CHR-ROM or CHR-RAM at $1C00
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| '''Note:''' Pages $E0-$FF are CHR-RAM, as long as $E800.7 is set to 0. If $E800.7 is set to 1, then pages $E0-$FF refer to the last $20 pages of CHR-ROM as you'd expect.
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| === Nametable Select 1 ($C000-$C7FF) w ===
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| 7 bit 0
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| ---- ----
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| NNNN NNNN
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| |||| ||||
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| ++++-++++- Select nametable at $2000:
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| $00-$DF: Use a 1KB page of CHR-ROM as a nametable
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| $E0-$FF: Use the NES's internal nametables (even values for A, odd values for B)
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| '''Note:''' On mapper 210, this register has no effect.
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| === Nametable Select 2 ($C800-$CFFF) w ===
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| 7 bit 0
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| ---- ----
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| NNNN NNNN
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| |||| ||||
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| ++++-++++- Select nametable at $2400:
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| $00-$DF: Use a 1KB page of CHR-ROM as a nametable
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| $E0-$FF: Use the NES's internal nametables (even values for A, odd values for B)
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| '''Note:''' On mapper 210, this register has no effect.
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| === Nametable Select 3 ($D000-$D7FF) w ===
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| 7 bit 0
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| ---- ----
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| NNNN NNNN
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| |||| ||||
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| ++++-++++- Select nametable at $2800:
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| $00-$DF: Use a 1KB page of CHR-ROM as a nametable
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| $E0-$FF: Use the NES's internal nametables (even values for A, odd values for B)
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| '''Note:''' On mapper 210, this register has no effect.
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| === Nametable Select 4 ($D800-$DFFF) w ===
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| 7 bit 0
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| ---- ----
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| NNNN NNNN
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| |||| ||||
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| ++++-++++- Select nametable at $2C00:
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| $00-$DF: Use a 1KB page of CHR-ROM as a nametable
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| $E0-$FF: Use the NES's internal nametables (even values for A, odd values for B)
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| '''Note:''' On mapper 210, this register has no effect.
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| === PRG Select 1 ($E000-$E7FF) w ===
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| 7 bit 0
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| ---- ----
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| ..PP PPPP
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| || ||||
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| ++-++++- Select 8KB page of PRG-ROM at $8000
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| === PRG Select 2 / CHR-RAM Enable ($E800-$EFFF) w ===
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| 7 bit 0
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| ---- ----
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| HLPP PPPP
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| |||| ||||
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| ||++-++++- Select 8KB page of PRG-ROM at $A000
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| |+-------- Disable CHR-RAM at $0000-$0FFF
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| | 0: Pages $E0-$FF are CHR-RAM
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| | 1: Pages $E0-$FF are the last $20 banks of CHR-ROM)
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| +--------- Disable CHR-RAM at $1000-$1FFF
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| 0: Pages $E0-$FF are CHR-RAM
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| 1: Pages $E0-$FF are the last $20 banks of CHR-ROM)
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| === PRG Select 3 ($F000-$F7FF) w ===
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| 7 bit 0
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| ---- ----
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| ..PP PPPP
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| || ||||
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| ++-++++- Select 8KB page of PRG-ROM at $C000
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| === Sound Address Port ($F800-$FFFF) w ===
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| See [[Namco 163 audio]].
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| == IRQ Operation ==
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| The IRQ is a 15-bit CPU cycle up-counter. $5000 and $5800 provide ''direct'' access to the counter itself (i.e., this isn't a reload value). Games can read and write to these registers in realtime.
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| The IRQ counter increments on each CPU cycle. Upon reaching $7FFF, an IRQ is fired. However, it is unknown if the counter wraps to $0000 afterwards. Reading/Writing to $5000 or $5800 will acknowledge any pending IRQs.
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