INT 10 - Everex Extended Video BIOS - GET PAGING FUNCTION POINTER FOR CURR MODE
        AX = 7000h
        BX = 0004h
Return: ES:DI -> FAR paging function (call with DL = page to set)
Note:   the word preceding ES:DI is the length of the function in bytes, and
          the last byte of the function is a FAR return instruction.
SeeAlso: AX=7000h/BX=0000h,AX=7000h/BX=0005h