Expects: AX    5306H
Returns: CY    clear (always succeeds)
Info: This function informs the BIOS that processing should continue at
full speed.

You may access this service via INT 15H or by using the APM entry
address obtained via INT 15H 5302H or INT 15H 5303H (protected
mode connect).

The BIOS will usually be able to tell when it should switch back
to full-speed operation, but it is possible that an interrupt has
been hooked which keeps the BIOS uninformed.  In that case, you
may wish to use this call once or twice per second to tell the
BIOS to keep the CPU awake.

See Also: APM API
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INT 15H 5306H: CPU Busy