Not too far back, there was a time when it was inconceivable that a motherboard had anything other than a green or mustard colored PCB that had a few sockets for the CPU and DIMMs, maybe a hard drive connector or two, and a floppy drive connection. Keyboards and mice were typically PS/2 based, although a COM port sufficed for those still attached to their serial mice, and the list of input/output options were quite few. The late 90's brought about the rise of the Universal Serial Bus, a new standard for interfacing with devices intended to retire legacy serial and parallel ports (although that still has yet to fully come about).

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