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| {{DEFAULTSORT:017}}[[Category:INES Mappers]][[Category:Mappers with cycle IRQs]][[Category:Mappers with scanline IRQs]] | | {{DEFAULTSORT:017}}[[Category:INES Mappers]][[Category:Mappers with cycle IRQs]][[Category:Mappers with scanline IRQs]][[Category:Mappers with ROM nametables]] |
| '''iNES Mapper 017''' is used for ROM images that have been converted from disk images for or the native file format of the ''Front Fareast Super Magic Card'' RAM cartridge. | | '''iNES Mapper 017''' denotes ROM images that have been extracted from disk images for the ''Front Fareast Super Magic Card'' [[RAM cartridge]]. They represent games whose [[Game_Doctor/Magic_Card_FDS_Format#Front_Fareast_Super_Magic_Card_disks|Doctor Header file]] denotes a Super Magic Card disk (byte $0 bit 7 set, byte $7=$AA). Refer to the [[Super Magic Card]] article for details on bankswitching. The Super Magic Card's registers are initialized to: |
| | ; Play mode, WRAM bank 0, 1 KiB CHR mode enabled |
| | [[Super_Magic_Card#Super_Magic_Card_mode_.28.244500.2C_write-only.29|$4500]] = $47 |
| | |
| | ; PRG memory write-protected, two-screen mirroring |
| | [[Super_Magic_Card#1M_banking_mode_.28.2442FC-.2442FF.2C_write-only.29|$42FF]] = $20 | (verticalMirroring? 0x00: 0x10) |
| | |
| | ; 4M banking mode enabled |
| | [[Super_Magic_Card#2M.2F4M_PRG_banking_mode_.28.2443FC-.2443FF.2C_write-only.29|$43FC]] = $00 |
| | |
| | ; Initial PRG register content |
| | $4504 = Number of 8 KiB PRG banks -4 |
| | $4505 = Number of 8 KiB PRG banks -3 |
| | $4506 = Number of 8 KiB PRG banks -2 |
| | $4507 = Number of 8 KiB PRG banks -1 (originally [[Game_Doctor/Magic_Card_FDS_Format#Front_Fareast_Super_Magic_Card_disks|Doctor Header file]] byte $5) |
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| =Banks (in game mode)=
| | The [[iNES]] header may specify a [[INES#Trainer|512-byte trainer]] (corresponding to [[Game_Doctor/Magic_Card_FDS_Format#Front_Fareast_Super_Magic_Card_disks|Doctor Header file]]'s byte $0 bit 6 being set). The trainer must be loaded to an address originally denoted by the [[Game_Doctor/Magic_Card_FDS_Format#Front_Fareast_Super_Magic_Card_disks|Doctor Header file]]'s byte $2, and is here denoted by the NES 2.0 submapper. In its presence, instead of jumping to the game's reset vector on a hard reset, trainer offset +$000 must be JMPed to. |
| * CPU $5000-$5FFF: 4 KiB scratch RAM bank, fixed
| | Submapper Trainer load address |
| * CPU $6000-$7FFF: 8 KiB WRAM bank, switchable via register $4500 from 32 KiB total
| | 0 $7000 |
| * CPU $8000-$9FFF: 8 KiB PRG-ROM bank, switchable via register $4504 from 512 KiB total
| | 1 $5D00 |
| * CPU $A000-$BFFF: 8 KiB PRG-ROM bank, switchable via register $4505 from 512 KiB total
| | 2 $5E00 |
| * CPU $C000-$DFFF: 8 KiB PRG-ROM bank, switchable via register $4506 from 512 KiB total
| | 3 $5F00 |
| * CPU $E000-$FFFF: 8 KiB PRG-ROM bank, switchable via register $4507 from 512 KiB total
| |
| * PPU $0000-$03FF: 1 KiB CHR-RAM bank, switchable via register $4510 from 256 KiB total
| |
| * PPU $0400-$07FF: 1 KiB CHR-RAM bank, switchable via register $4511 from 256 KiB total
| |
| * PPU $0800-$0BFF: 1 KiB CHR-RAM bank, switchable via register $4512 from 256 KiB total
| |
| * PPU $0C00-$0FFF: 1 KiB CHR-RAM bank, switchable via register $4513 from 256 KiB total
| |
| * PPU $1000-$13FF: 1 KiB CHR-RAM bank, switchable via register $4514 from 256 KiB total
| |
| * PPU $1400-$17FF: 1 KiB CHR-RAM bank, switchable via register $4515 from 256 KiB total
| |
| * PPU $1800-$1BFF: 1 KiB CHR-RAM bank, switchable via register $4516 from 256 KiB total
| |
| * PPU $1C00-$1FFF: 1 KiB CHR-RAM bank, switchable via register $4517 from 256 KiB total
| |
| * PPU $2000-$23FF: 1 KiB CIRAM or CHR-RAM bank, CHR-RAM bank switchable via register $4518 from 256 KiB total
| |
| * PPU $2400-$27FF: 1 KiB CIRAM or CHR-RAM bank, CHR-RAM bank switchable via register $4519 from 256 KiB total
| |
| * PPU $2800-$2BFF: 1 KiB CIRAM or CHR-RAM bank, CHR-RAM bank switchable via register $451A from 256 KiB total
| |
| * PPU $2C00-$2FFF: 1 KiB CIRAM or CHR-RAM bank, CHR-RAM bank switchable via register $451B from 256 KiB total
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| =Registers=
| | Battery-saving of WRAM content is not supported by any Magic Card model. Hard-resetting a game while restoring previously-saved WRAM content in emulators interferes with the correct operation of the trainer's program. |
| ==PRG-"ROM" Write-protection/Mirroring ($42FC-$42FF, write)==
| |
| A~FEDC BA98 7654 3210 D~7654 3210
| |
| ------------------- ---------
| |
| 0100 0010 1111 11PM ...M ....
| |
| |+-------+------ Set nametable mirroring type
| |
| | (if CIRAM is enabled)
| |
| | 0: One-screen, page 0
| |
| | 1: One-screen, page 1
| |
| | 2: Vertical
| |
| | 3: Horizontal
| |
| +--------------- PRG-"ROM" write-protection
| |
| 0: disabled, PRG-"ROM" write-enabled
| |
| 1: enabled, PRG-"ROM" write-protected
| |
| | |
| ==Configuration Register ($4500, write)==
| |
| D~7654 3210
| |
| ---------
| |
| PMWW ImNC
| |
| |||| |||+- CHR-RAM mode
| |
| |||| ||| 0: Game-Doctor-compatible mode, do not use $4510-$4517
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| |||| ||| 1: Super Magic Card mode, use $4510-$4517
| |
| |||| ||+-- Nametable mode
| |
| |||| || 0: CHR-RAM, use $4518-$451C
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| |||| || 1: CIRAM, mirrored according to $42FC-$42FF
| |
| |||| |+--- [[MMC4]]-like Latch in Super Magic Card CHR-RAM mode
| |
| |||| | 0: Enabled (ignored when C=0)
| |
| |||| | 1: Disabled
| |
| |||| +---- IRQ source select
| |
| |||| 0: M2 rise
| |
| |||| 1: PA12 rise (unfiltered, e.g. 8 rises per scanline)
| |
| ||++------ Select 8 KiB WRAM bank at CPU $6000-$7FFF
| |
| |+-------- Select memory map
| |
| | 0: GUI/Load: $6000-$BFFF: PRG-"ROM"/WRAM
| |
| | $C000-$FFFF: BIOS
| |
| | 1: Game: $6000-$7FFF: WRAM
| |
| | $8000-$FFFF: PRG-"ROM"
| |
| +--------- Pass-through mode
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| 0: Disabled, show GUI or play game from PRG-"ROM"
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| 1: Enabled, play cartrige inserted into SMC's cartridge connector
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| | |
| ==IRQ Disable ($4501, write)==
| |
| Acknowledges IRQ and disables counting.
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| | |
| ==IRQ Counter Low Byte ($4502, write)==
| |
| This is the low byte of a '''15-bit''' (D0-D14) counter that, if nonzero, is increased on every M2/PA12 rise and raises an IRQ when the counter flips from $7FFF to $0000. Writing to this register also acknowledges the IRQ.
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| | |
| ==IRQ Counter High Byte ($4503, write)==
| |
| This is the high byte of a '''15-bit''' (D0-D14) counter that, if nonzero, is increased on every M2/PA12 rise and raises an IRQ when the counter flips from $7FFF to $0000. Writing to this register also acknowledges the IRQ and enables counting.
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| | |
| ==PRG-"ROM" Bank registers ($4504-$4507, write)==
| |
| * $4504: Set 8 KiB PRG-"ROM" bank at CPU $8000-$9FFF
| |
| * $4505: Set 8 KiB PRG-"ROM" bank at CPU $A000-$BFFF
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| * $4506: Set 8 KiB PRG-"ROM" bank at CPU $C000-$DFFF
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| * $4507: Set 8 KiB PRG-"ROM" bank at CPU $E000-$FFFF. Hard reset default: last bank.
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| | |
| ==CHR-RAM Bank registers ($4510-$451B, write)==
| |
| * $4510: Set 1 KiB CHR-RAM bank at PPU $0000-$03FF
| |
| * $4511: Set 1 KiB CHR-RAM bank at PPU $0400-$07FF
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| * $4512: Set 1 KiB CHR-RAM bank at PPU $0800-$0BFF
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| * $4513: Set 1 KiB CHR-RAM bank at PPU $0C00-$0FFF
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| * $4514: Set 1 KiB CHR-RAM bank at PPU $1000-$13FF
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| * $4515: Set 1 KiB CHR-RAM bank at PPU $1400-$17FF
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| * $4516: Set 1 KiB CHR-RAM bank at PPU $1800-$1BFF
| |
| * $4517: Set 1 KiB CHR-RAM bank at PPU $1C00-$1FFF
| |
| * $4518: Set 1 KiB CHR-RAM bank at PPU $2000-$23FF if $4500.1=0
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| * $4519: Set 1 KiB CHR-RAM bank at PPU $2400-$27FF if $4500.1=0
| |
| * $451A: Set 1 KiB CHR-RAM bank at PPU $2800-$2BFF if $4500.1=0
| |
| * $451B: Set 1 KiB CHR-RAM bank at PPU $2C00-$2FFF if $4500.1=0
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| | |
| If the MMC4-like latch is enabled ($4500.0=1 and $4500.1=1), the meaning of these registers differs:
| |
| * $4510/$4511, D3-D7: Set 4 KiB CHR-RAM bank at PPU $0000-$0FFF when latch=0
| |
| * $4512/$4513, D3-D7: Set 4 KiB CHR-RAM bank at PPU $0000-$0FFF when latch=1
| |
| * $4514/$4515, D3-D7: Set 4 KiB CHR-RAM bank at PPU $1000-$1FFF when latch=0
| |
| * $4516/$4517, D3-D7: Set 4 KiB CHR-RAM bank at PPU $1000-$1FFF when latch=1
| |
| * PPU A10 still selects between even and odd registers, so both should receive the same value.
| |
| * As on the Nintendo [[MMC4]], the latch is set to 0 when the PPU reads from $0FD8-$0FDF/$1FD8-$1FDF and to 1 when the PPU reads from $0FE8-$0FEF/$1FE8-$1FEF.
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| =Notes=
| |
| * 512-byte Trainers are loaded and initialized by JMP/JSRing to an address specified by the header of the SMC's native file format. iNES format files lack this information. Heuristically, battery-backup games load and JMP to $5D00, non-battery games with CHR-ROM load and JMP to $7000, while CHR-ROM-less games load to $7000 and JSR to $7003 before JMPing to ($FFFC).
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| * BIOS changes every game's NMI vector to a routine at $5032 that checks whether the unit's real-time save button has been pressed before passing control to the game's original NMI handler. As a result, M2-based IRQs set up in that handler will occur 75 M2 cycles later than normally.
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