X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos

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INT 21 - DOS - SET CURRENT TIME
        AH = 2Dh
        CH = hours
        CL = minutes
        DH = seconds
        DL = hundredths of seconds
Return: AL = 00h if no error
           = FFh if bad value sent to routine
Note:   DOS 3.3+ also sets CMOS clock
SeeAlso: AH=2Bh"DOS",AH=2Ch,INT 1A/AH=01h,03h,FFh

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