INES Mapper 088: Difference between revisions
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(This is really a dupe of 206) |
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A possible way to implement this would be to mask the CHR ROM 1K bank output from the mapper by ANDing with $3F, and then OR it with $40 if the PPU address was >= $1000. | A possible way to implement this would be to mask the CHR ROM 1K bank output from the mapper by ANDing with $3F, and then OR it with $40 if the PPU address was >= $1000. | ||
If the CHR ROM is | If the CHR ROM is 64K or smaller, it is identical to mapper 206. | ||
Example Games: | Example Games: | ||
Revision as of 18:36, 28 June 2014
iNES Mapper 088 is the same as mapper 206 with the following exception:
- CHR support is increased to 128KB by connecting PPU's A12 line to the CHR ROM's A16 line.
Consequently, CHR is split into two halves. $0xxx can only have CHR from the first 64K, $1xxx can only have CHR from the second 64K.
A possible way to implement this would be to mask the CHR ROM 1K bank output from the mapper by ANDing with $3F, and then OR it with $40 if the PPU address was >= $1000.
If the CHR ROM is 64K or smaller, it is identical to mapper 206.
Example Games: -------------------------- Quinty (J) Namcot Mahjong 3 Dragon Spirit - Aratanaru Densetsu
