INES Mapper 060: Difference between revisions
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1: CPU $8000-$FFFF returns Jumper/DIP switch value | 1: CPU $8000-$FFFF returns Jumper/DIP switch value | ||
==Jumper Value ($8000-$FFFF, read)== | ==Jumper Value ($8000-$FFFF, read)== | ||
Mask: | Mask: $8000 | ||
D~7654 3210 | D~7654 3210 | ||
| Line 50: | Line 50: | ||
|||| ||++- Current jumper value, selecting menu variants with different game counts | |||| ||++- Current jumper value, selecting menu variants with different game counts | ||
++++-++--- Open bus | ++++-++--- Open bus | ||
==Similar Mappers== | ==Similar Mappers== | ||
[[INES Mapper 059]] is almost identical to D1038/VT5201 right down to the Jumper Read Control, the only difference being that the PRG-ROM size is always 32 KiB, and the 32 KiB PRG-ROM bank is directly selected via CPU A4-A6 instead of A5-A6. | [[INES Mapper 059]] is almost identical to D1038/VT5201 right down to the Jumper Read Control, the only difference being that the PRG-ROM size is always 32 KiB, and the 32 KiB PRG-ROM bank is directly selected via CPU A4-A6 instead of A5-A6. | ||
Revision as of 08:47, 1 June 2018
iNES Mapper 60 is used for two very different multicarts. In the absence of a submapper proposal, the PRG-ROM size can be used to differentiate between the Reset-based 4-in-1 (PRG-ROM size up to 64 KiB) and D1038/VT5201 (PRG_ROM size 128 KiB and more).
Reset-based NROM-128 4-in-1
Here are Disch's original notes: ======================== = Mapper 060 = ======================== Example Game: -------------------------- Reset Based 4-in-1 Notes: --------------------------- This mapper is very, very unique. It's a multicart that consists of four NROM games, each with 16k PRG (put at $8000 and $C000) and 8k CHR. The current block that is selected is determined by an internal register that can only be incremented by a soft reset! I would assume the register is 2 bits wide? Don't know for sure.
D1038/VT5201
FCEUX and several emulators emulate a completely unreleated multicart with the UNIF board name BMC-D1038 under Mapper 060:
Address Latch ($8000-$FFFF, write)
Mask: $8000
A~FEDC BA98 7654 3210
---------------------
1... ...D SPPp MCCC
| |||| |+++- Select 8 KiB CHR-ROM bank at PPU $0000-$1FFF
| |||| +---- Select nametable mirroring type
| |||| 0: Vertical
| |||| 1: Horizontal
| |+++------ Select 16 KiB PRG-ROM bank at CPU $8000-$BFFF/$C000-$FFFF
| +--------- Select PRG A14 behavior
| 0: Substitute b with CPU A14 (NROM-256, 32 KiB PRG-ROM)
| 1: Leave b unchanged (NROM-128, 16 KiB PRG-ROM)
+----------- Jumper Read Control
0: CPU $8000-$FFFF returns PRG-ROM content
1: CPU $8000-$FFFF returns Jumper/DIP switch value
Jumper Value ($8000-$FFFF, read)
Mask: $8000 D~7654 3210 --------- OOOO OOJJ |||| ||++- Current jumper value, selecting menu variants with different game counts ++++-++--- Open bus
Similar Mappers
INES Mapper 059 is almost identical to D1038/VT5201 right down to the Jumper Read Control, the only difference being that the PRG-ROM size is always 32 KiB, and the 32 KiB PRG-ROM bank is directly selected via CPU A4-A6 instead of A5-A6.
