INES Mapper 087: Difference between revisions
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("misinterpreted" is a bit loaded, as it could just as easily be interpreted as the mask ROMs having a swapped pinout. In this sense 101 does exist.) |
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CHR, so the 'H' bit is usually unused. | CHR, so the 'H' bit is usually unused. | ||
[[iNES Mapper 101]] | [[iNES Mapper 101]] is the exact same board, but the bits misinterpreted as in order. [[CNROM]] (which postdates mapper 87) is the same but with the bits in order and bus conflicts. | ||
[[CNROM]] (which postdates mapper 87) is the same but with the bits in order and bus conflicts. | |||
Revision as of 01:42, 25 April 2014
Here are Disch's original notes:
========================
= Mapper 087 =
========================
Example Games:
--------------------------
Argus (J)
City Connection (J)
Ninja Jajamaru Kun
Notes:
---------------------------
Regs are at $6000-7FFF, so these games have no SRAM.
Registers:
--------------------------
$6000-7FFF: [.... ..LH]
H = High CHR Bit
L = Low CHR Bit
This reg selects 8k CHR @ $0000. Note the reversed bit orders. Most games using this mapper only have 16k
CHR, so the 'H' bit is usually unused.
iNES Mapper 101 is the exact same board, but the bits misinterpreted as in order. CNROM (which postdates mapper 87) is the same but with the bits in order and bus conflicts.
