NES 2.0 Mapper 431: Difference between revisions
From NESdev Wiki
Jump to navigationJump to search
NewRisingSun (talk | contribs) (Created page with "'''NES 2.0 Mapper 431''' denotes the ''Realtec GN-91B'', use a multicart consisting of two UNROM games.") |
NewRisingSun (talk | contribs) No edit summary |
||
| Line 1: | Line 1: | ||
'''NES 2.0 Mapper 431''' denotes the '' | {{DEFAULTSORT:431}}[[Category:Multicart mappers]][[Category:Mappers with CHR RAM]] | ||
'''NES 2.0 Mapper 431''' denotes the Realtec '''GN-91B''', use a multicart consisting of two UNROM games. | |||
==Outer Bank Register ($8000-$BFFF)== | |||
Mask: $C000 | |||
D~7654 3210 (bus conflicts) | |||
--------- | |||
..P. ...M | |||
| +- 0: Vertical mirroring | |||
| 1: Horizontal mirroring | |||
+--- PRG A17 | |||
==Inner Bank Register ($C000-$FFFF)== | |||
Mask: $C000 | |||
D~7654 3210 (bus conflicts) | |||
--------- | |||
.... .PPP | |||
+++- PRG A16..A14 if CPU A14=0 | |||
Revision as of 14:46, 18 December 2021
NES 2.0 Mapper 431 denotes the Realtec GN-91B, use a multicart consisting of two UNROM games.
Outer Bank Register ($8000-$BFFF)
Mask: $C000
D~7654 3210 (bus conflicts)
---------
..P. ...M
| +- 0: Vertical mirroring
| 1: Horizontal mirroring
+--- PRG A17
Inner Bank Register ($C000-$FFFF)
Mask: $C000
D~7654 3210 (bus conflicts)
---------
.... .PPP
+++- PRG A16..A14 if CPU A14=0
