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spjewkes / jrnz

A work-in-progress ZX Spectrum emulator
MIT License
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The function impl_sub() seems to be setting the overflow according to the carry bit #10

Closed spjewkes closed 3 months ago

spjewkes commented 7 years ago

This looks like a bug that should be checking the overflow rather than the carry. We need to check if the logic itself is correct too.

spjewkes commented 3 months ago

Closing this. I believe we've resolved this issue (based on testing z80doc)