X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 11

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INT 11 - BACK&FORTH API
        AX = FFFEh
        CX = FFFEh
        BX = function
            00h installation check
                Return: AX = 0001h BNFHIGH and BNFLOW both loaded
                           = 0003h only BNFHIGH loaded
                           else neither loaded
            01h ???
                Return: DX:AX -> ???
            02h ???
            03h ???
            04h ???
            05h ??? switches current PSP segment and stack if BNFLOW has not
                    yet announced itself installed
            06h ???
                Return: AX = ???

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