INES Mapper 210: Difference between revisions
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| Chibi Maruko-chan: Uki Uki Shopping || No || No || V | | Chibi Maruko-chan: Uki Uki Shopping || No || No || V | ||
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| Dream Master || No || No || H | |||
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| Family Circuit '91 || Yes || 2 KiB || V | | Family Circuit '91 || Yes || 2 KiB || V | ||
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===Namco 340 (Submapper 2)=== | ===Namco 340 (Submapper 2)=== | ||
* Famista '92 | * Famista '92 | ||
* Famista '93 | * Famista '93 |
Revision as of 12:41, 5 April 2020
Namco 175
Company | Namco |
Games | 4 in NesCartDB |
Complexity | ASIC |
Boards | 110F0B |
PRG ROM capacity | 512K |
PRG ROM window | 8Kx3 + 8K fixed |
PRG RAM capacity | 8K |
PRG RAM window | 8K |
CHR capacity | 256K |
CHR window | 1Kx8 |
Nametable mirroring | H or V fixed |
Bus conflicts | No |
IRQ | No |
Audio | No |
iNES mappers | 210 |
Namco 340
Company | Namco |
Games | 8 in NesCartDB |
Complexity | ASIC |
Boards | CS000x |
PRG ROM capacity | 512K |
PRG ROM window | 8Kx3 + 8K fixed |
PRG RAM capacity | none |
PRG RAM window | none |
CHR capacity | 256K |
CHR window | 1Kx8 |
Nametable mirroring | H, V, or 1 switchable |
Bus conflicts | No |
IRQ | No |
Audio | No |
iNES mappers | 210 |
iNES Mapper 210 is used to denote Famicom boards bearing either the Namco 175 (Submapper 1) or Namco 340 (Submapper 2) ASIC. Both can be thought of as cost-reduced versions of the Namco 163:
Function | N163 | N175 | N340 |
---|---|---|---|
IRQ counter | Yes | No | No |
ROM nametables | Yes | No | No |
Optional WRAM | Yes | Yes | No |
Expansion audio | Yes | No | No |
ASIC-internal RAM | Yes | No | No |
Mirroring | Selectable (extended) | Hard-wired H/V | Selectable H/V/0 |
Game list
Namco 175 (Submapper 1)
Name | Battery | WRAM | Mirroring |
---|---|---|---|
Chibi Maruko-chan: Uki Uki Shopping | No | No | V |
Dream Master | No | No | H |
Family Circuit '91 | Yes | 2 KiB | V |
Famista '91 | No | No | V |
Heisei Tensai Bakabon | No | No | V |
Namco 340 (Submapper 2)
- Famista '92
- Famista '93
- Famista '94
- Splatterhouse: Wanpaku Graffiti
- Top Striker
- Wagyan Land 2
- Wagyan Land 3
Banks
- CPU $6000-$7FFF: 2 KB PRG RAM bank, mirrored four times (Namco 175 only)
- CPU $8000-$9FFF: 8 KB switchable PRG ROM bank
- CPU $A000-$BFFF: 8 KB switchable PRG ROM bank
- CPU $C000-$DFFF: 8 KB switchable PRG ROM bank
- CPU $E000-$FFFF: 8 KB PRG ROM bank, fixed to the last bank
- PPU $0000-$03FF: 1 KB switchable CHR bank
- PPU $0400-$07FF: 1 KB switchable CHR bank
- PPU $0800-$0BFF: 1 KB switchable CHR bank
- PPU $0C00-$0FFF: 1 KB switchable CHR bank
- PPU $1000-$13FF: 1 KB switchable CHR bank
- PPU $1400-$17FF: 1 KB switchable CHR bank
- PPU $1800-$1BFF: 1 KB switchable CHR bank
- PPU $1C00-$1FFF: 1 KB switchable CHR bank
Registers
The 175 and 340 have 12 registers within $8000-$FFFF. Each register occupies a range of $800 bytes, so $8000-$87FF all refers to one register, $8800-$8FFF all refers to another register, and so on.
CHR Select ($8000-$BFFF) w
Value CPU writes | Behavior |
---|---|
$00-$FF | Selects 1KB page of CHR-ROM |
Write to CPU address | 1KB CHR bank affected |
---|---|
$8000-$87FF | $0000-$03FF |
$8800-$8FFF | $0400-$07FF |
$9000-$97FF | $0800-$0BFF |
$9800-$9FFF | $0C00-$0FFF |
$A000-$A7FF | $1000-$13FF |
$A800-$AFFF | $1400-$17FF |
$B000-$B7FF | $1800-$1BFF |
$B800-$BFFF | $1C00-$1FFF |
External PRG RAM enable ($C000-$C7FF) w (Namco 175 only)
7 bit 0 ---- ---- .... ...E | +- 1: Enable PRG RAM
PRG Select 1 ($E000-$E7FF) w
7 bit 0 ---- ---- MMPP PPPP |||| |||| ||++-++++- Select 8KB page of PRG-ROM at $8000 ++-------- Namco 340 only: Select mirroring 0: One-screen A 1: Vertical 2: Horizontal 3: One-screen B
PRG Select 2 ($E800-$EFFF) w
7 bit 0 ---- ---- ..PP PPPP || |||| ++-++++- Select 8KB page of PRG-ROM at $A000
PRG Select 3 ($F000-$F7FF) w
7 bit 0 ---- ---- ..PP PPPP || |||| ++-++++- Select 8KB page of PRG-ROM at $C000
Notes
- Family Circuit '91 relies on its 2 KiB of WRAM being correctly mirrored throughout the $6000-$7FFF address range.
- Many INES Mapper 210 games are incorrectly set to INES Mapper 019.
- In the absence of a NES 2.0 header with submapper 1 or 2 to distinguish between Namco 175 and 340, the following heuristics have been suggested:
- If $E000.6 or $E000.7 are ever set, this should be a Namcot 340.
- If the game ever reads from or writes to PRG RAM, this is a Namco 175 with external RAM.
- If the game ever writes to $C000, this is probably a Namco 175.