INES Mapper 101: Difference between revisions
("erroneously"? I'm more likely to think "room for expansion") |
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[[Category:iNES Mappers|101]][[Category:Discrete logic mappers|101]][[Category:Bad iNES Mappers|101]] | [[Category:iNES Mappers|101]][[Category:Discrete logic mappers|101]][[Category:Bad iNES Mappers|101]] | ||
This mapper | This mapper was allocated for a naïve misdumping of the [http://bootgod.dyndns.org:7777/profile.php?id=1547 JF-10] board that contains ''Urusei Yatsura - Lum no Wedding Bell''. JF-10 is identical to [http://bootgod.dyndns.org:7777/profile.php?id=3004 JF-09], which is the only [[iNES Mapper 087|mapper 87]] game with 32KiB CHR. Both JF-10 and JF-09 only differ from all their predecessors ([http://bootgod.dyndns.org:7777/profile.php?id=3006 JF-05], [http://bootgod.dyndns.org:7777/profile.php?id=2282 -06], [http://bootgod.dyndns.org:7777/profile.php?id=2283 -07], and [http://bootgod.dyndns.org:7777/profile.php?id=1732 -08]) by the addition of a single trace. In short, either mapper 87 should be capped to 16KiB CHR, or mapper 101 never had a hardware instantiation. | ||
Supported in r3420 BizHawk, r2696 FCEUX (probably has been supported for eons), and reportedly MESS. | Supported in r3420 BizHawk, r2696 FCEUX (probably has been supported for eons), and reportedly MESS. | ||
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C = Selects 8k CHR @ $0000 | C = Selects 8k CHR @ $0000 | ||
This is the same as [[iNES Mapper 087|mapper 87]] but with the bits in order, or the same as [[CNROM]] without bus conflicts. | This is the same as [[iNES Mapper 087|mapper 87]] but with the bits in order, and so has a better defined [[oversize]] extension; or the same as [[CNROM]] without bus conflicts. | ||
Jaleco subsequently extended the JF-09 and JF-10 boards to add the ability to bank PRG in a [[GNROM]]-like manner. That was allocated to [[iNES Mapper 140]]. | |||
Revision as of 20:09, 5 November 2013
This mapper was allocated for a naïve misdumping of the JF-10 board that contains Urusei Yatsura - Lum no Wedding Bell. JF-10 is identical to JF-09, which is the only mapper 87 game with 32KiB CHR. Both JF-10 and JF-09 only differ from all their predecessors (JF-05, -06, -07, and -08) by the addition of a single trace. In short, either mapper 87 should be capped to 16KiB CHR, or mapper 101 never had a hardware instantiation.
Supported in r3420 BizHawk, r2696 FCEUX (probably has been supported for eons), and reportedly MESS.
Registers:
---------------------------
$6000-7FFF: [CCCC CCCC]
C = Selects 8k CHR @ $0000
This is the same as mapper 87 but with the bits in order, and so has a better defined oversize extension; or the same as CNROM without bus conflicts.
Jaleco subsequently extended the JF-09 and JF-10 boards to add the ability to bank PRG in a GNROM-like manner. That was allocated to iNES Mapper 140.
