![]() Both speeds can be connected to a single USB bus.Īh, the bus. Devices like keyboards and mice will use the slower speed devices like Zip drives, printers, and scanners will use the faster speed. In comparison, the Mac's serial ports max out at 230.4 Kbps, and ADB at just over 1 Kbps. USB devices can talk to the computer at two speeds: 1.5 Mbps or 12 Mbps (that's millions of bits per second, and remember, there are 8 bits per byte if you want to translate to bytes per second). Given that USB is intended to replace the parallel port as well as lower-speed serial ports, and to do it all at once, it's pretty speedy. ![]() Keep in mind that on a PC, the parallel port is used not just for printers but also for other devices such as Zip drives, tape drives, scanners, and even some modems. This includes not only the serial ports but also keyboard ports, mouse ports (which, on a PC, are basically another serial port), and parallel ports. USB is intended to replace all the various types of low-to-medium-speed data ports hanging off the back of a PC (although most current PCs with USB also have at least some of the old-style ports). But that's no worse than how Windows plug-and-play often works.) (Bill Gates's widely reported COMDEX crash occurred as he was connecting a USB scanner to a PC running Windows 98. Most late-model PCs have at least one USB port, and Windows 98 introduces plug-and-play support for devices attached to the USB port. ![]() What Is USB? USB stands for "Universal Serial Bus" and is a special kind of serial port that's growing in popularity in the Windows world. Why is Apple moving to USB? What was wrong with serial ports and what's good about USB ports? Gone were our familiar ADB ports and modem ports and printer ports, not to mention SCSI. With the announcement of the iMac we started hearing a totally new abbreviation in the Macintosh world - USB. ![]()
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