Sonnet’s Allegro USB 2 card is available for $30 and supports Mac OS 9 and later. Other USB PCI cards can be found through searches on Amazon and eBay and drivers can still be acquired online as needed. Floppy drives How about turning to old tech to fix the problem? Since the files on your old Mac are very likely small in size, you might want to consider getting a USB floppy drive, which costs about $20 through retailers like Newegg and Amazon, and some 3.5-inch floppy disks. Connect the floppy drive to your old Mac, copy the files to floppy disks, and then connect the drive to your current Mac and copy the files over.