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AH = 06h DL = FFh
Return:
ZF set if no character available AL = 00h ZF clear if character available AL = character read
Notes: ^C/^Break are NOT checked. If the returned character is 00h, the user pressed a key with an extended keycode, which will be returned by the next call of this function. This function reads from standard input, which is always the keyboard under DOS 1.x, but may be redirected under DOS 2+. Although the return of AL=00h when no characters are available is not documented, some programs rely on this behavior
See Also: AH=0Bh
Category: DOS Kernel - Int 21h - D
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