I/O Ports read upper byte

For hardware talk only (please avoid ROM dumper stuff)
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mickagame
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I/O Ports read upper byte

Post by mickagame » Sun Jun 07, 2015 6:34 pm

Does anyone knows what happens when reading higher byte of I/O ports?
In doc they said that in case of byte access only lower byte is meaningful (mean odd adress).

notaz
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Post by notaz » Wed Jun 10, 2015 4:44 pm

IIRC it's just mirrored, it's also documented in gen-hw.txt

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