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 ←↑↓→