INES Mapper 099: Difference between revisions

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m (move function table to Vs. System so that we don't have two copies of it)
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It is comparable to [[CNROM]], but without bus conflicts.
It is comparable to [[CNROM]], but without bus conflicts.


== Registers ==
The Vs. System has other ports related to coin insertion and DIP switches that must be emulated to get games to advance past [[wikipedia:Attract mode|attract mode]], and most games' palettes differ from the standard RGB NES palette used by ''Duck Hunt'' and PlayChoice games.
=== Controller and CHR ROM bank ($4016) ===
7  bit  0
---- ----
xxxx xCxS
      | |
      | +- 1 then 0: Request a report from the [[controller port registers|controller ports]]
      +--- Select 8 KB CHR ROM bank for PPU $0000-$1FFF
            Note: In case of games with 40K PRG-ROM (as found in VS Gumshoe),
                  the above bit does additionally change 8K PRG-ROM at $8000-$9FFF.
 
The Vs. System has other ports related to coin insertion and DIP switches that must be emulated to get games to advance past attract mode, and most games' palettes differ from the standard RGB NES palette used by ''Duck Hunt'' and PlayChoice games.
See [[Vs. System]] for more information.
See [[Vs. System]] for more information.

Revision as of 18:55, 7 October 2012

Mapper 99 is a simple mapper used by Vs. System games such as Vs. Super Mario Bros. It is comparable to CNROM, but without bus conflicts.

The Vs. System has other ports related to coin insertion and DIP switches that must be emulated to get games to advance past attract mode, and most games' palettes differ from the standard RGB NES palette used by Duck Hunt and PlayChoice games. See Vs. System for more information.

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