NES 2.0 Mapper 417: Difference between revisions
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{{DEFAULTSORT:417}}[[Category:Mappers with cycle IRQs]] | {{DEFAULTSORT:417}}[[Category:Mappers with cycle IRQs]] | ||
'''NES 2.0 Mapper 417''' denotes the PCB of the "Fine Studio" bootleg copy of ''Batman: The Video Game''. | '''NES 2.0 Mapper 417''' denotes the PCB of the "Fine Studio" bootleg copy of ''Batman: The Video Game'' (submapper 0) and of ''RoboCop'' (submapper 1). | ||
=Banks= | =Banks= | ||
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Write to $8022: Select 1 KiB CHR-ROM bank at PPU $1800 | Write to $8022: Select 1 KiB CHR-ROM bank at PPU $1800 | ||
Write to $8023: Select 1 KiB CHR-ROM bank at PPU $1C00 | Write to $8023: Select 1 KiB CHR-ROM bank at PPU $1C00 | ||
Additional meaning for Submapper 1: | |||
Write to $8010: (bit 7) Select 1 KiB CIRAM bank at PPU $2000 | |||
Write to $8011: (bit 7) Select 1 KiB CIRAM bank at PPU $2400 | |||
Write to $8012: (bit 7) Select 1 KiB CIRAM bank at PPU $2800 | |||
Write to $8013: (bit 7) Select 1 KiB CIRAM bank at PPU $2C00 | |||
==IRQ Control== | ==IRQ Control== | ||
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Write to $8040: Disable and acknowledge IRQ | Write to $8040: Disable and acknowledge IRQ | ||
The counter increases on every M2 cycle regardless of IRQ enable status. If enabled, an IRQ is generated upon 10-bit counter overflow. | The counter increases on every M2 cycle regardless of IRQ enable status. If enabled, an IRQ is generated upon 10-bit (submapper 0)/12-bit (submapper 1) counter overflow. | ||
==CIRAM Bank Select== | ==CIRAM Bank Select (Submapper 0 only)== | ||
Mask: $8073 | Mask: $8073 | ||
Write to $8050: Select 1 KiB CIRAM bank at PPU $2000 | Write to $8050: Select 1 KiB CIRAM bank at PPU $2000 | ||
Latest revision as of 13:49, 30 October 2022
NES 2.0 Mapper 417 denotes the PCB of the "Fine Studio" bootleg copy of Batman: The Video Game (submapper 0) and of RoboCop (submapper 1).
Banks
- CPU $8000-$9FFF: 8 KiB switchable PRG-ROM bank
- CPU $A000-$BFFF: 8 KiB switchable PRG-ROM bank
- CPU $C000-$DFFF: 8 KiB switchable PRG-ROM bank
- CPU $E000-$FFFF: 8 KiB fixed PRG-ROM bank, last
- PPU $0000-$03FF: 1 KiB switchable CHR-ROM bank
- PPU $0400-$07FF: 1 KiB switchable CHR-ROM bank
- PPU $0800-$0BFF: 1 KiB switchable CHR-ROM bank
- PPU $0C00-$0FFF: 1 KiB switchable CHR-ROM bank
- PPU $1000-$13FF: 1 KiB switchable CHR-ROM bank
- PPU $1400-$17FF: 1 KiB switchable CHR-ROM bank
- PPU $1800-$1BFF: 1 KiB switchable CHR-ROM bank
- PPU $1C00-$1FFF: 1 KiB switchable CHR-ROM bank
- PPU $2000-$23FF: 1 KiB switchable CIRAM bank
- PPU $2400-$27FF: 1 KiB switchable CIRAM bank
- PPU $2800-$2BFF: 1 KiB switchable CIRAM bank
- PPU $2C00-$2FFF: 1 KiB switchable CIRAM bank
Registers
PRG-ROM Bank Select
Mask: $8073 Write to $8000: Select 8 KiB PRG-ROM bank at CPU $8000 Write to $8001: Select 8 KiB PRG-ROM bank at CPU $A000 Write to $8002: Select 8 KiB PRG-ROM bank at CPU $C000
CHR-ROM Bank Select
Mask: $8073 Write to $8010: Select 1 KiB CHR-ROM bank at PPU $0000 Write to $8011: Select 1 KiB CHR-ROM bank at PPU $0400 Write to $8012: Select 1 KiB CHR-ROM bank at PPU $0800 Write to $8013: Select 1 KiB CHR-ROM bank at PPU $0C00 Write to $8020: Select 1 KiB CHR-ROM bank at PPU $1000 Write to $8021: Select 1 KiB CHR-ROM bank at PPU $1400 Write to $8022: Select 1 KiB CHR-ROM bank at PPU $1800 Write to $8023: Select 1 KiB CHR-ROM bank at PPU $1C00
Additional meaning for Submapper 1:
Write to $8010: (bit 7) Select 1 KiB CIRAM bank at PPU $2000 Write to $8011: (bit 7) Select 1 KiB CIRAM bank at PPU $2400 Write to $8012: (bit 7) Select 1 KiB CIRAM bank at PPU $2800 Write to $8013: (bit 7) Select 1 KiB CIRAM bank at PPU $2C00
IRQ Control
Mask: $8070 Write to $8030: Reset counter and enable IRQ Write to $8040: Disable and acknowledge IRQ
The counter increases on every M2 cycle regardless of IRQ enable status. If enabled, an IRQ is generated upon 10-bit (submapper 0)/12-bit (submapper 1) counter overflow.
CIRAM Bank Select (Submapper 0 only)
Mask: $8073 Write to $8050: Select 1 KiB CIRAM bank at PPU $2000 Write to $8051: Select 1 KiB CIRAM bank at PPU $2400 Write to $8052: Select 1 KiB CIRAM bank at PPU $2800 Write to $8053: Select 1 KiB CIRAM bank at PPU $2C00
