NES 2.0 Mapper 431: Difference between revisions
From NESdev Wiki
Jump to navigationJump to search
NewRisingSun (talk | contribs) No edit summary |
NewRisingSun (talk | contribs) mNo edit summary |
||
| Line 1: | Line 1: | ||
{{DEFAULTSORT:431}}[[Category:Multicart mappers]][[Category:Mappers with CHR RAM]] | {{DEFAULTSORT:431}}[[Category:Multicart mappers]][[Category:Mappers with CHR RAM]] | ||
'''NES 2.0 Mapper 431''' denotes the Realtec '''GN-91B''', | '''NES 2.0 Mapper 431''' denotes the Realtec '''GN-91B''', used by a multicart consisting of two UNROM games. | ||
==Outer Bank Register ($8000-$BFFF)== | ==Outer Bank Register ($8000-$BFFF)== | ||
Revision as of 14:53, 18 December 2021
NES 2.0 Mapper 431 denotes the Realtec GN-91B, used by 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
