Quote:
Originally Posted by JMJ_coder
...what they are useful for, why use one, etc.
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Serial connections are good for controlling & monitoring headless systems in the absence of a network connection. Sun hardware is especially good of redirecting console output to a serial port if a keyboard & monitor are not detected at boot. In contrast, the classic Wintel hardware configuration is particularly bad at this
especially if you want to access the BIOS configuration of a headless system at boot. This is why you will find the headless Wintel world depending on KVM's which emulate keyboard/video/mouse connections -- hooking up monitors & keyboards is the only way to gain this kind of control.