INES Mapper 101: Difference between revisions

From NESdev Wiki
Jump to navigationJump to search
("erroneously"? I'm more likely to think "room for expansion")
(reorder (put warning at top); link to m140.)
Line 1: Line 1:
[[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 is used for instance by ''Urusei Yatsura - Lum no Wedding Bell'', the Famicom version of Jaleco's ''[[wikipedia:Momoko 120%|Momoko 120%]]''.
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.
Line 9: Line 9:
     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.


This mapper seems to be a naive misdumping of the [http://bootgod.dyndns.org:7777/profile.php?id=1547 JF-10] board that contains ''Urusei Yatsura''. JF-10 is identical to [http://bootgod.dyndns.org:7777/profile.php?id=3004 JF-09], which is the only 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. In any case, mapper 101 has a better defined [[oversize]] extension.
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.