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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
See Also: AH=06h"INPUT" - AX=4406h
Category: DOS Kernel - Int 21h - D
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