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How can I work acad r13 on a new vista machine than has only usb port yet acadr13 is looking for the serial or parallel ports
Sorry - there is a long history (10 versions) between the old AutoCAD R13 and the newest OS. There is no compatibility.
Either downgrade your OS or upgrade your AutoCAD.
Thank you ,I'll think on upgrade
You could buy a parallel port card from your local computer store and install it into a PCI slot on your computers motherboard.