Printers from yesteryear used parallel ports. Modems used serials ports — which were available in either 9- or 25-pin varieties. High-speed devices like scanners and external drives used to connect via any number of SCSI connections. A company I used to work for even made products that let you daisy-chain two together via parallel port, and even came out with a drive that you could plug into either a parallel port or a 25-pin SCSI port. Even common devices like keyboards and mice connected through a PS/2 or other style connector. Put another way, there were just far too many kinds of ...
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