X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 2+ internal

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INT 21 - DOS 2+ internal - GET SWITCHAR
        AX = 3700h
Return: AL = FFh unsupported subfunction
        DL = current switch character
Notes:  documented in some OEM versions of some releases of DOS
        supported by OS/2 compatibility box
SeeAlso: AX=3701h

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