qa.hlp (Table of Contents; Topic list)
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Int 21H Function 03H
   Summary  Notes  Back
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  Description:  Auxiliary Input
 
  Reads a character from the standard auxiliary device. The default is
  the first serial port (COM1).
 
  Input             Output
  ══════            ═══════════════════
  AH=03H            AL=8-bit input data
                                    -♦-