MSC: unsigned _bios_timeofday( unsigned cmd, long *timeval )

	- prototype in bios.h

	- cmd	= _TIME_GETCLOCK	get real time clock  (INT 1A,0)
		= _TIME_SETCLOCK	set real time clock  (INT 1A,1)

	- returns current BIOS clock count
	- Turbo C uses biostime()
	- see  INT 1A