Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Interrupt 21h, Record Functions (FCB)
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     Interrupt 21h──Record Functions (FCB)
 
     You can perform all the functions below more easily with functions
     available in DOS 2.0 and later. The services below are documented
     so you can analyze code written for earlier version of DOS.
 
     Function     Name
 
     14h          Sequential Read
     15h          Sequential Write
     21h          Random Read
     22h          Random Write
     24h          Set Relative Record Number
     27h          Random Block Read
     28h          Random Block Write
 
     See also: FCB Description
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