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r188914 Thursday 18th August, 2022 at 00:54:08 UTC by grantek
Implement SCC baud rate calculation (#10181)

- Also fix baud counter registers
Reference: http://www.zilog.com/docs/serial/ps0117.pdf

The X68000 uses the Clock Mode feature of the SCC, which multiplies the baud period by 16. Combined with a bug that read the baud counter from the wrong registers, this meant the emulator had two baud rate expiry callbacks running at some MHz.
[/branches/barcrest/src/devices/machine]8530scc.cpp 8530scc.h


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