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   Serial Protocols Compared
TIA/EIA-232-F (typically referred to as RS-232) is a common interface that can be found on almost every personal computer. RS-232 is a complete standard, not only including electrical characteristics, but physical and mechanical characteristics as well, such as connection hardware, pin-outs, and signal names.
   Introduction to Interrupts
When a device asserts its interrupt request signal, it must be processed in an orderly fashion. All CPUs, and many devices, have some mechanism for enabling/disabling interrupt recognition and processing:
   Synergy cross-computer keyboard/mouse use
Synergy is FOSS that lets you easily share a single mouse and keyboard between multiple computers with different operating systems, without special hardware. All you need is a LAN connection. It's intended for users with multiple computers, where each system uses its own display.

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