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Question about general BIOS behavior regarding register usage

by Edevaldo on 15-01-2019, 02:32
Score: 170.24 %, Type: Forum topic , Comments: 1 comment
I was looking into the Technical Reference manual and Red Book regarding register usage in some of the BIOS routines. Taking BEEP (0x00C0) as an example, documentation says all registers are clobbered. Disassembling the function I noticed IX,IY return intact (and SP off course), as is expected from a BIOS ...

MU-01 MSX Yamaha mouse fix

by Edevaldo on 07-01-2019, 08:43
Score: 177.18 %, Type: Forum topic , Comments: 12 comments
position is critical, I would think. It has to accurately point to the wheel so even a 0.5mm offset would ... to the wheel so even a 0.5mm offset would be problematic, no? I don't think. This is not like ...
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