Fix setting of serial port speed. A junk value was passed in AX when bioscom is called to set up serial port parameters because COMSPEED was treated as an address instead of an immediate value, causing serial port parameters to never be set.
Fix setting of serial port speed. A junk value was passed in AX when
bioscom is called to set up serial port parameters because COMSPEED
was treated as an address instead of an immediate value, causing
serial port parameters to never be set.

PR:		i386/110828
Reviewed by:	jhb
MFC after:	2 weeks

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