Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Int 21h Function 2Ch
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     This function's register format is the same as that required for
     Int 21h Function 2Dh (Set Time).
 
     On most IBM PC-compatible systems, the real-time clock does not
     have a resolution of single hundredths of seconds. On such
     machines, the values returned by this function in register DL are
     discontinuous.
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