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 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 $4500 = $47 ; PRG memory write-protected, two-screen mirroring $42FF = $20 | (verticalMirroring? 0x00: 0x10) ; 4M banking mode enabled $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 Doctor Header file byte $5)
The iNES header may specify a 512-byte trainer (corresponding to Doctor Header file's byte $0 bit 6 being set). The trainer must be loaded to an address originally denoted by the 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.
Submapper Trainer load address 0 $7000 1 $5D00 2 $5E00 3 $5F00
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.
Categories: Mappers with scanline IRQs, INES Mappers, Mappers with cycle IRQs, Mappers with ROM nametables