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Int 21 Fn 0B - DOS 1+ - Get Stdin Status [D]
AH = 0Bh
Return: AL = 00h if no character available
= FFh if character is available
Notes: 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
See Also: AH=06h"INPUT",AX=4406h
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