The Commodore 64 was one of the most popular microcomputers of its era, and is the best-selling model of home computer of all time.[1]
computer with a microprocessor as its central processing unit. They are physically small compared to mainframe and minicomputers. Many microcomputers (when equipped with a keyboard and screen for input and output) are also personal computers (in the generic sense).[2][3]

The abbreviation "micro" was common during the 1970s and 1980s,[4] but has now fallen out of common usage.



The term "Microcomputer" came into popular use after the introduction of the minicomputer, although Isaac Asimov used the term microcomputer in his short story "The Dying Night" as early as 1956 (published in The Magazine of Fantasy and Science Fiction in July that year). Most notably, the microcomputer replaced the many separate components that made up the minicomputer's CPU with one integrated microprocessor chip. The earliest models such as the Altair 8800 were often sold as kits to be assembled by the user, and came with as little as 256 bytes of RAM, and no input/output devices other than indicator lights and switches, useful as a proof of concept to demonstrate what such a simple device could do. The term "Microcomputer" also was seriously employed for the first time designating the Micral N as the first solid state machine designed with a microprocessor. However, as microprocessors and semiconductor memory became less expensive, microcomputers in turn grew cheaper and easier to use:

  • Increasingly inexpensive logic chips such as the 7400 series allowed cheap dedicated circuitry for improved user interfaces such as keyboard input, instead of simply a row of switches to toggle bits one at a time.
  • Use of audio cassettes for inexpensive data storage replaced manual re-entry of a program every time the device was powered on.
  • Large cheap arrays of silicon logic gates in the form of Read-only memory and EPROMs allowed utility programs and self-booting kernels to be stored within microcomputers. These stored programs could automatically load further more complex software from external storage devices without user intervention, to form an inexpensive turnkey system that does not require a computer expert to understand or to use the device.
  • Random access memory became cheap enough to afford dedicating approximately 1-2 kilobytes of memory to a video display controller frame buffer, for a 40x25 or 80x25 text display or blocky color graphics on a common household television. This replaced the slow, complex, and expensive teletypewriter that was previously common as an interface to minicomputers and mainframes.

All these improvements in cost and usability resulted in an explosion in their popularity during the late 1970s and early 1980s. A large number of computer makers packaged microcomputers for use in small business applications. By 1979, many companies such as Cromemco, Processor Technology, IMSAI, Northstar, Southwest Technical Products Corporation, Ohio Scientific, Altos, Morrow Designs and others produced systems designed either for a resourceful end user or consulting firm to deliver business systems such as accounting, database management, and word processing to small businesses. This allowed businesses unable to afford leasing of a minicomputer or time-sharing service the opportunity to automate business functions, without (usually) hiring a full-time staff to operate the computers. A representative system of this era would have used an S100 bus, an 8-bit processor such as a Intel 8080 or Zilog Z80, and either CP/M or MP/M operating system. The increasing availability and power of desktop computers for personal use attracted the attention of more software developers. In time, and as the industry matured, the market for personal computers standardized around IBM PC compatibles running DOS, and later Windows. Modern desktop computers, video game consoles, laptops, tablet PCs, and many types of handheld devices, including mobile phones, pocket calculators, and industrial embedded systems, may all be considered examples of microcomputers according to the definition given above.

Colloquial use of the term

Everyday use of the expression "microcomputer" (and in particular the "micro" abbreviation) has declined significantly from the mid-1980s onwards, and is no longer commonplace. It is most commonly associated with the first wave of all-in-one 8-bit home computers and small business microcomputers (such as the Apple II, Commodore 64, BBC Micro, and TRS 80). Although, or perhaps because, an increasingly diverse range of modern microprocessor-based devices fit the definition of "microcomputer," they are no longer referred to as such in everyday speech.

In common usage, "microcomputer" has been largely supplanted by the description "personal computer" or "PC," which describes that it has been designed to be used by one person at a time. IBM first promoted the term "personal computer" to differentiate themselves from other microcomputers, often called "home computers", and also IBM's own mainframes and minicomputers. However, following its release, the IBM PC itself was widely imitated, as well as the term. The component parts were commonly available to producers and the BIOS was reverse engineered through cleanroom design techniques. IBM PC compatible "clones" became commonplace, and the terms "personal computer," and especially "PC" stuck with the general public.

Since the advent of microcontrollers (monolithic integrated circuits containing RAM, ROM and CPU all onboard), the term "micro" is more commonly used to refer to that meaning.[citation needed]


Monitors, keyboards and other devices for input and output may be integrated or separate. Computer memory in the form of RAM, and at least one other less volatile, memory storage device are usually combined with the CPU on a system bus in one unit. Other devices that make up a complete microcomputer system include batteries, a power supply unit, a keyboard and various input/output devices used to convey information to and from a human operator (printers, monitors, human interface devices). Microcomputers are designed to serve only one user at a time, although they can often be modified with software or hardware to concurrently serve more than one user. Microcomputers fit well on or under desks or tables, so that they are within easy access of users. Bigger computers like minicomputers, mainframes, and supercomputers take up large cabinets or even dedicated rooms.

A microcomputer comes equipped with at least one type of data storage, usually RAM. Although some microcomputers (particularly early 8-bit home micros) perform tasks using RAM alone, some form of secondary storage is normally desirable. In the early days of home micros, this was often a data cassette deck (in many cases as an external unit). Later, secondary storage (particularly in the form of floppy disk and hard disk drives) were built into the microcomputer case.


A collection of early microcomputers, including a Processor Technology SOL-20 (top shelf, right), an MITS Altair 8800 (second shelf, left), a TV Typewriter (third shelf, center), and an Apple I in the case at far right.

Although they contained no microprocessors but were built around transistor-transistor logic (TTL), Hewlett-Packard calculators as far back as 1968 had various levels of programmability such that they could be called microcomputers. The HP 9100B (1968) had rudimentary conditional (if) statements, statement line numbers, jump statements (go to), registers that could be used as variables, and primitive subroutines. The programming language resembled Assembly language in many ways. Later models incrementally added more features, including the BASIC programming language (HP 9830A in 1971). Some models had tape storage and small printers. However, displays were limited to one line at a time. [1] The HP 9100A was referred to as a personal computer in an advertisement in a 1968 Science magazine[5] but that advertisement was quickly dropped.[6] It is suspected[who?] that HP was reluctant to call them "computers" because it would complicate government procurement and export procedures.[citation needed]ggg

The Datapoint 2200, made by CTC in 1970, is perhaps the best candidate for the title of "first microcomputer". While it contains no microprocessor, it used the 4004 programming instruction set and its custom TTL was the basis for the Intel 8008, and for practical purposes the system behaves approximately as if it contains an 8008. This is because Intel was the contractor in charge of developing the Datapoint's CPU but ultimately CTC rejected the 8008 design because it needed 20 support chips.[7]

Another early system, the Kenbak-1, was released in 1971. Like the Datapoint 2200, it used discrete transistor–transistor logic instead of a microprocessor, but functioned like a microcomputer in most ways. It was marketed as an educational and hobbyist tool, but was not a commercial success; production ceased shortly after introduction.[2]

In 1972, for the first time is marketed a solid state computer designed with a microprocessor (the Intel 8008 8-bit microprocessor). This machine the Micral-N, was created by a Frenchman François Gernelle of the company R2E. In 1973 this machine is widely named in the entire world a "microcomputer". Since this machine, all computers designed with a microprocessor, personal computers, workstations even servers, will be called microcomputers.

In 1972, a Sacramento State University team led by Bill Pentz built the Sac State 8008 computer,[8] able to handle thousands of patients' medical records. The Sac State 8008 was designed with the Intel 8008. It had a full set of hardware and software components: a disk operating system included in a series of programmable read-only memory chips (PROMs); 8 Kilobytes of RAM; IBM's Basic Assembly Language (BAL); a hard drive; a color display; a printer output; a 150 bit/s serial interface for connecting to a mainframe; and even the world's first microcomputer front panel.[9]

Virtually all early microcomputers were essentially boxes with lights and switches; one had to read and understand binary numbers and machine language to program and use them (the Datapoint 2200 was a striking exception, bearing a modern design based on a monitor, keyboard, and tape and disk drives). Of the early "box of switches"-type microcomputers, the MITS Altair 8800 (1975) was arguably the most famous. Most of these simple, early microcomputers were sold as electronic kits--bags full of loose components which the buyer had to solder together before the system could be used.

The period from about 1971 to 1976 is sometimes called the first generation of microcomputers. These machines were for engineering development and hobbyist personal use.[10] In 1975, the Processor Technology SOL-20 was designed, which consisted of one board which included all the parts of the computer system. The SOL-20 had built-in EPROM software which eliminated the need for rows of switches and lights. The MITS Altair just mentioned played an instrumental role in sparking significant hobbyist interest, which itself eventually led to the founding and success of many well-known personal computer hardware and software companies, such as Microsoft and Apple Computer. Although the Altair itself was only a mild commercial success, it helped spark a huge industry.

By 1977, the introduction of the second generation, known as home computers, made microcomputers considerably easier to use than their predecessors because their predecessors' operation often demanded thorough familiarity with practical electronics. The ability to connect to a monitor (screen) or TV set allowed visual manipulation of text and numbers. The BASIC language, which was easier to learn and use than raw machine language, became a standard feature. These features were already common in minicomputers, with which many hobbyists and early produces were familiar.

In 1979, the launch of the VisiCalc spreadsheet (initially for the Apple II) first turned the microcomputer from a hobby for computer enthusiasts into a business tool. After the 1981 release by IBM of its IBM PC, the term personal computer became generally used for microcomputers compatible with the IBM PC architecture (PC compatible).

References and footnotes

  1. ^ Kahney, Leander. "Grandiose Price for a Modest PC". Wired. Lycos. http://www.wired.com/news/culture/0,60349-0.html. Retrieved 2006-10-25. 
  2. ^ An early use of the term "personal computer" in 1962 predates microprocessor-based designs. (See "Personal Computer: Computers at Home" reference below). A "microcomputer" used as an embedded control system may have no human-readable input and output devices. "Personal computer" may be used generically or may denote an IBM PC compatible machine.
  3. ^ "Personal Computer: Computers at Home", Wikipedia article section. Version used dated 2006-11-04, retrieved 2006-11-07.
  4. ^ Proof of "micro" as a once-common term:
    (i) Direct reference: Graham Kibble-White, "Stand by for a Data-Blast", Off the Telly. Article written December 2005, retrieved 2006-12-15.
    (ii) Usage in the titles of Christopher Evans' books "The Mighty Micro" (ISBN 0-340-25975-2) and "The Making of the Micro" (ISBN 0-575-02913-7). Other books include Usborne's "Understanding the Micro" (ISBN 0-86020-637-8), a children's guide to microcomputers.
  5. ^ http://www.hp.com/hpinfo/abouthp/histnfacts/museum/personalsystems/0021/other/0021ad.pdf
  6. ^ http://www.sciencemag.org/cgi/issue_pdf/frontmatter_pdf/162/3852.pdf
  7. ^ MicroprocessorHistory
  8. ^ http://www.digibarn.com/stories/bill-pentz-story/index.html
  9. ^ http://news.cnet.com/8301-13772_3-10429544-52.html
  10. ^ Computer Adventures. http://books.google.com/books?id=kawCnk4051wC&lpg=PA139&pg=PA154#v=onepage&q&f=false. 

See also

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