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As with any electronic equipment, it is good idea to make sure it is compatible with whatever you are going to attach it to. Scanners often need a USB cable to attach to the computer case. Some scanners can attach using FireWire, SCSI, or a parallel port. Usually older scanners will have only the ability to attach through a parallel port. Therefore, it is possible to see the different problems that can arise with an old computer without USB and a USB scanner, or a new computer with USB and an old scanner with only parallel port attachment. This is why it is necessary to check the interface before buying your new scanner.