INES Mapper 087: Difference between revisions
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(m101 doesn't exist, so shouldn't be preferred.) |
("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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| Line 28: | Line 28: | ||
CHR, so the 'H' bit is usually unused. | CHR, so the 'H' bit is usually unused. | ||
[[iNES Mapper 101]] | [[iNES Mapper 101]] refers to the exact same board, but the banks are stored in the ROM image in logical order. | ||
[[CNROM]] (which postdates mapper 87) is the same but with the bits in order and bus conflicts. | |||
Revision as of 00:13, 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 refers to the exact same board, but the banks are stored in the ROM image in logical order. CNROM (which postdates mapper 87) is the same but with the bits in order and bus conflicts.
