C language functions for millisecond timing on the IBM PC - Springer

dostime() function the address ofthe start_time struc­ ture into which the dostime( ) function stores the current time. (The fix_time_of_day() function restores the time-of-dayclock by adding the elapsed milliseconds to the start time.) In line 020, a control word (36 hex) is output to port 43 hex, which prepares the 8253 timer to receive a new ................
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