* R0 = 0
R1 = non-zero to disconnect immediately
* Registers preserved
This call closes any active connection and ends use of the configured block driver. This allows other programs to use the serial port. It is equivalent to using *PsiFSDisable.
If R1 is set to a non-zero value then PsiFS does not wait for data to be flushed, so may result in data being lost. It should only be used as a last resort.
No action is taken if the block driver is already disabled.
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