HelpPC 2.10 Quick Reference Utility Copyright 1991 David Jurgens

                    INT 21,B - Check Standard Input Status

       AH = 0B

       on return:
       AL = 00 if no character available
          = FF if character available

       - checks STDIN for available characters
       - character is not returned
       - if Ctrl-Break is detected INT 23 is executed

Esc or Alt-X to exit int 21,b Home/PgUp/PgDn/End ←↑↓→
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