The Computers: Hardware: (Systems Hardware )

Computer systems are any set of hardware, firmware, and peripherals, designed to work together. For personal computers, PCs, a system comprises at least the following: a system unit housing hardware and, the motherboard and any related expansion boards, disk drives (hard, floppy, CD-DVD), memory; a keyboard, a mouse and a monitor. Other devices may be present, such as a printer, modem or backup tape drive. Operating systems and application software can be thought of as parts of a full computer system, but this section focuses on HARDWARE components only. The Computers-Systems section covers hardware and software systems. Systems Hardware Computers.

In the 19th century the French physicist Nicolas Léonard Sadi Carnot, who studied thermodynamics, pioneered the development of the concept of a "system" in the natural sciences. (wikipedia)