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| [[Category:INES Mappers|186]] {{DEFAULTSORT:186}} [[category:Mappers using $4020-$5FFF]] [[Category:Mappers with large PRG RAM]]
| | {{DEFAULTSORT:186}}[[Category:Bad iNES Mappers]][[Category:INES Mappers]] |
| | | '''iNES Mapper 186''' was originally assigned for the BIOS of the [[Fukutake Study Box]]. The only emulators that emulate this device, Mesen and NintendulatorNRS, both require the BIOS image as a headerless .BIN file however, making this mapper assignment useless. |
| [[iNES Mapper 186]] is used for Fukutake Shoten's Japanese edutainment game ''Study Box''. This information is currently identical to FCEUX's source and should NOT be treated as any more authoritative.
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| Write mask: $FE03
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| $4200 write: [RR.. ....] - select one of four 8 KiB PRG-RAM banks at $6000
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| $4201 write: [.... PPPP] - select one of sixteen 16 KiB PRG-ROM banks at $8000
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| $4202 write: unknown
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| $4203 write: unknown
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| TCRF claims that there's a printer interface.
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| Read mask: $FFFF
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| $4200, $4201, $4203 read: returns $00
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| $4202 read: returns $40
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| $4204-$43FF read: returns $FF
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| The readable ports may have something to do with what Санчез describes as an "Audio Tape reader" and "power supply condition". TCRF additionally mentions a touchpad interface.
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| Memory locations:
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| $4400-$4FFF: 3 KiB PRG-RAM
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| $6000-$7FFF: 8 KiB PRG-RAM bank (one of four)
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| $8000-$BFFF: 16 KiB switchable PRG-ROM bank
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| $C000-$FFFF: 16 KiB fixed PRG-ROM bank (always bank 0)
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| Having 35 KiB of PRG-RAM seems unlikely, and probable that the 3 KiB slice overlaps with some of the bankable 32 KiB of RAM. Санчез doesn't say anything more specific, unfortunately.
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| See also:
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| * http://cah4e3.shedevr.org.ru/dumping_2005.php
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| * http://sourceforge.net/p/fceultra/code/HEAD/tree/fceu/trunk/src/boards/186.cpp
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| * https://tcrf.net/StudyBox
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| * https://github.com/SourMesen/Mesen/files/2920256/studybox.org.txt
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iNES Mapper 186 was originally assigned for the BIOS of the Fukutake Study Box. The only emulators that emulate this device, Mesen and NintendulatorNRS, both require the BIOS image as a headerless .BIN file however, making this mapper assignment useless.
