1. A computer system that utilizes a microprocessor as its central control and arithmetic element. The personal computer is one form. The power and price of a microcomputer is determined partly by the speed and power of the processor and partly by the characteristics of other components of the system, i.e. the memory, the disk units, the display, the keyboard, the flexibility of the hardware, and the operating system and other software.

Memory sizes range up to several terabytes and the access speed can also vary considerably. Optical disks’ capacities lie in the hundreds of gigabyte range, as do the capacities of USB flash drives, while hard disk capacities are in the terabyte range. Microcomputer displays are generally high-definition colour monitors based on CRT and LCD technologies. LCD and plasma displays are used on laptops, notebooks, and other portable models. The flexibility of the hardware can be measured by the number and type of enhancements available. These might include extra memory, more disk drives, pointing devices, communications interfaces, and the ability to participate in networks. The operating system can be characterized by its use of memory, how much can be accessed and how well it is done, how many tasks can be run concurrently, and how it appears to the user.

2. A single integrated circuit containing all the logic elements needed for a complete computer system.