INT 21 - DOS 1+ - GET STDIN STATUS AH = 0Bh Return: AL = status 00h if no character available FFh if character is available Notes: ^C/^Break are checked, and INT 23 is called if either pressed standard input is always the keyboard under DOS 1.x, but may be redirected under DOS 2+ if the interim console flag is set (see AX=6301h), this function returns AL=FFh if a partially-formed double-byte character is available SeeAlso: AH=06h"INPUT",AX=4406h