X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 4.x internal - determine if character represents yes/no response

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INT 21 - DOS 4.x internal - DETERMINE IF CHARACTER REPRESENTS YES/NO RESPONSE
        AX = 6523h
        DL = character
        DH = second character of double-byte character (if applicable)
Return: CF set on error
        CF clear if successful
            AX = type
                00h no
                01h yes
                02h neither yes nor no

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