INT 78 - AutoCAD 10 ADI for Plotters
        AX = function
            0001h initialize comm port and reset plotter
                BX = ??? (comm port?)
            0002h close plotter
            0003h move (pen up)
                BX = new X position
                CX = new Y position
            0004h move (pen down)
                BX = new X position
                CX = new Y position
            0005h select pen
                BX = pen number
            0006h select drawing speed
                BX = drawing speed N
            0007h select line style
                BX = line style N
            0008h return pen to pen carrier??? (called before change-pen cmd)
Return: ???
SeeAlso: INT 7B"AutoCAD"