Computers were not always personal
For the first few decades of electronic computing, a computer was something an organization owned. Universities, governments and large companies ran big machines in dedicated rooms, and most users submitted work to operators and waited for the results. Even the smaller machines of the 1960s were far beyond the budget of an individual.
The idea of a computer used by one person, on their own desk, grew out of several developments that matured at roughly the same time. Chips became small and cheap enough to build into a modest machine. Hobbyists wanted to experiment. Programming languages simple enough for beginners were available. And a few companies decided that selling computers to ordinary people might be worth trying. No single moment or machine started it, and the story is better understood as a series of overlapping steps.
The 1970s: hobbyists and kits
The technical starting point was the microprocessor, a processor placed on one chip, which appeared in the early 1970s. Once such chips were on the market, electronics enthusiasts could build small computers around them. The early microprocessors were limited, but they made it possible to imagine a machine that did not need a cabinet of circuit boards.
Several groups built small computers in this period, in the United States and elsewhere, and credit is shared rather than belonging to one inventor. Magazine articles that offered build-it-yourself designs reached a wide audience of hobbyists. The Altair 8800, sold as a kit and publicized on a magazine cover in early 1975, is often remembered as the machine that set off a wave of enthusiasm. It had switches and lights rather than a screen and keyboard, so it appealed mainly to people who enjoyed electronics for its own sake.
Hobby groups mattered a great deal in this stage. Members swapped circuit ideas, traded programs and encouraged each other, which is part of why hobbyist clubs are an important thread in the story. The kits themselves, and what they could and could not do, are covered in more detail under microcomputer kits, and the chip behind them in the discussion of microprocessors.
1977: ready-made machines
The big change in the later 1970s was that complete, assembled computers went on sale. Instead of soldering parts, a buyer could take a machine home, plug it into a television or a built-in display, and start using it. Three machines launched in 1977 are often grouped together as an early milestone: the Apple II, the Commodore PET and the Tandy TRS-80. Each had a keyboard, and each could run a simple version of the BASIC language, which let owners write their own small programs.
This was a different market from the kit era. The buyers were not only electronics experts but also small businesses, schools and curious families. A machine of this kind still cost real money and did relatively little by modern standards, yet it could run games, keep simple records and teach programming. The Apple I, an earlier and much smaller hobbyist product, had a modest direct role in all this, though its symbolic importance has grown over time.
Software became a major reason to buy a computer. Programs for accounts, text and games, along with spreadsheets later in the decade, gave people practical reasons to own one beyond tinkering. Storage also changed: cassette tapes gave way, for many users, to floppy disks, which made it easier to load and share programs.
The early 1980s: a business standard and a home boom
In 1981, IBM entered the market with its own personal computer. IBM was a respected name in business computing, and its decision to sell a desktop machine signaled that the category was being taken seriously by large organizations. The design used parts from outside suppliers and left room for other companies to build add-on cards and software, an approach that later allowed many rival makers to produce compatible machines. The story of the IBM PC, including the compatibles that followed, is told in its own article.
At the same time, a separate home computer market flourished. Inexpensive machines from several manufacturers, in the United States, Britain and elsewhere, were aimed at families and at young programmers. Many connected to a television, loaded software from cassettes or cartridges, and encouraged owners to learn BASIC. The period overlaps with the era of bedroom programmers who wrote and sold their own games. These machines competed in some ways with game consoles, though a computer could also be used for learning and for writing programs.
In 1984, Apple introduced the Macintosh, which brought the graphical user interface to a mass-market machine. The ideas behind that style of interface had been developed over previous years at research labs, including Xerox PARC, and Apple was not the only company working in the area. What the Macintosh helped show was that a computer could be operated by pointing at pictures rather than typing commands.
The late 1980s and 1990s: from purchase to habit
By the later 1980s, compatible machines running a Microsoft operating system had become the dominant business platform, while the home market consolidated around fewer makers. Prices tended to fall over time even as machines became more capable, which widened the range of people who could buy one. Word processors replaced typewriters in many offices, and spreadsheets and databases became everyday tools in small firms.
In the 1990s the graphical interface spread across the compatible machines, and computers increasingly came with a modem or network connection. Dial-up services, bulletin board systems and then the web gave people a reason to turn on a home computer even if they had no programming interest. By the end of the decade, a computer in the home was common in many wealthy countries, although far from universal. The decade-by-decade picture is also summarized in the articles on 1980s computers and 1990s computers.
What the story does and does not show
It is tempting to tell the rise of the personal computer as a tale of a few brilliant founders. A more accurate view includes chip designers, magazine editors, hobby groups, retailers, software authors and ordinary buyers who took a chance on an unfamiliar machine. Many early products failed commercially, and many good ideas did not win.
It is also worth remembering that access was never even. Price, language, infrastructure and local policy meant that some communities and countries adopted computers much later than others, a gap that later became known as the digital divide. The effects on work, play and learning were real, but they depended on who had a machine, and they are discussed further in the article on the personal computer’s effect on society.
The pattern across these decades is fairly clear. Computers moved from rare institutional tools to kits for enthusiasts, then to ready-made products, then to standard equipment in offices and many homes. Each step depended on lower costs, simpler use and a growing supply of software.