Mainframe computers a single unit that includes the system unit, a built-in monitor, a built-in keyboard, and built-in speakers.

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Mainframe computers are typically large and powerful computers used for large-scale computing purposes like data processing, transaction processing, or scientific research. They do not typically have a built-in monitor or keyboard, and instead rely on external devices for input and output.

Mainframe Computers a Single Unit That Includes the System Unit