Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
Interrupt 21h, Record Functions
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     Interrupt 21h──Record Functions
 
     Function     Name
 
     1Ah          Set Data Transfer Area (DTA) Address
     2Fh          Get DTA Address
     3Fh          Read File or Device
     40h          Write to File or Device
     42h          Set File Pointer (current location in file)
     5Ch          Lock or Unlock Region of File
     68h          Commit File (forces buffer to be written out)
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