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     The _bios_timeofday routine uses INT 0x1A to get or set the clock
     count. The <service> argument can be either the _TIME_GETCLOCK or
     _TIME_SETCLOCK manifest constant.
 
     Return Value
 
     If the argument is _TIME_GETCLOCK, the routine returns a nonzero
     value if midnight was passed since last read, or zero if midnight
     was not passed. If the argument is _TIME_SETCLOCK, the return
     value is undefined.
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