According to Hewlett-Packard technical representatives, these new models are similar to plotters in the DraftMaster series. You can try the following settings:
DraftPro DXL
Set the plotter's DIP switches to emulate a DraftPro. Under MacPlot Configure, indicate you are using a Hewlett-Packard DraftMaster I.
DraftPro EXL
Set the plotter's DIP switches to emulate a DraftPro. Under MacPlot Configure, indicate you are using a Hewlett-Packard DraftMaster II.
Their plotters will function to spec. with one difference: the 7575A and 7576A have a larger plot area than the DM series. You must purchase MacPlot professional if you wish to take advantage of the full plotting area available to you.