INES Mapper 101: Difference between revisions
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(Clean up article and update some info) |
m (→Bank Select ($6000-$7FFF): Formatting.) |
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|||| |||+- (Normal) Low CHR bit | |||| |||+- (Normal) Low CHR bit | ||
|||| ||+-- (Normal) High CHR bit | |||| ||+-- (Normal) High CHR bit | ||
++++-++ | ++++-++--- (Oversize only) Extra CHR bits | ||
This is the same as J87 but with the bits in order, and so has a better defined [[oversize]] extension; or the same as [[CNROM]] without bus conflicts. | This is the same as J87 but with the bits in order, and so has a better defined [[oversize]] extension; or the same as [[CNROM]] without bus conflicts. | ||
Latest revision as of 10:17, 25 October 2023
This mapper was allocated for a naïve misdumping of the JF-10 board that contains Urusei Yatsura - Lum no Wedding Bell, which assumed the bank bits were reversed. Otherwise, it is entirely identical to J87.
Registers
Bank Select ($6000-$7FFF)
This will select an 8 KB CHR ROM bank for PPU $0000-$1FFF.
7 bit 0 ---- ---- CCCC CCHL |||| |||| |||| |||+- (Normal) Low CHR bit |||| ||+-- (Normal) High CHR bit ++++-++--- (Oversize only) Extra CHR bits
This is the same as J87 but with the bits in order, and so has a better defined oversize extension; or the same as CNROM without bus conflicts.
