serial: RX function uses incorrect logic for external/internal clocking

deltabeard / Peanut-GB

A Game Boy (DMG) emulator single header library written in C99. Performance is prioritised over accuracy.

https://projects.deltabeard.com/peanutgb/

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Closed deltabeard closed 4 years ago

deltabeard commented 4 years ago

When external clock is selected, the SB register is not modified when no external peripheral or console is attached.