Personal computer

Lore & Background

Early personal computers, generally called microcomputers, were often sold in kit form and were of interest mostly to hobbyists and technicians. Minimal programming was done with toggle switches, and output was provided by front panel lamps. Practical use required adding peripherals such as keyboards, displays, disk drives, and printers.

Reader's Guide

Since the early 1990s, Microsoft operating systems (first with MS-DOS and then with Windows) and CPUs based on Intel's x86 architecture—collectively called Wintel—have dominated the personal computer market. Today the term PC normally refers to the ubiquitous Wintel platform, or to Windows PCs in general, to the point where software for Windows is marketed as 'for PC'. Alternatives to Windows occupy a minority share, including the Mac platform from Apple (running macOS) and free and open-source Unix-like operating systems such as Linux (including ChromeOS). Other notable platforms until the 1990s were the Amiga, Atari ST, and the PC-98 line. Personal computers are meant to be operated directly by an end user, rather than by a computer expert, administrator, company or technician. Unlike large, costly minicomputers and mainframes, time-sharing by many people at the same time is not used with personal computers. The term 'home computer' was used primarily in the late 1970s and 1980s.

Did You Know?

• The term 'PC' originally described personal computers of any brand, not just IBM-compatible machines.

From Silicon to Single-User Machines

The personal computer's story begins not in a garage but in semiconductor laboratories. These advances transformed computing from a realm of massive, expensive mainframes into something a single person could operate. By the early 1970s, academic and research settings offered single-person interactive access, though ownership by an individual remained financially out of reach.

The Hobbyist Decade and the Mother of All Demos

The 1970s marked the era when computers first became tangible objects for ordinary people, though the experience was far from polished. Early microcomputers were frequently sold as kits in small quantities, appealing primarily to hobbyists and technicians. Programming meant flipping toggle switches to enter instructions, and results appeared as patterns of glowing front-panel lamps. Making these machines genuinely useful required bolting on peripherals—keyboards, displays, disk drives, printers. The irony was that his demonstration depended on a mainframe time-sharing system and support staff, far beyond any individual's budget.

Wintel, Mac, and the Platform Wars

Since the early 1990s, the personal computer market has been overwhelmingly defined by a single pairing: Microsoft operating systems, beginning with MS-DOS and evolving into Windows, running on Intel x86-based processors. This combination, colloquially dubbed Wintel, became so dominant that the word "PC" in common usage now almost exclusively refers to a Windows-based machine, even when the underlying chip is ARM rather than x86. Software publishers routinely label their products "for PC," cementing the association. Apple's Mac platform, running macOS, and free open-source Unix-like systems such as Linux and its derivative ChromeOS hold minority market shares. Before the 1990s, the competitive landscape was broader, with the Amiga, Atari ST, and Japan's PC-98 line all carving out meaningful audiences. The terminology itself has caused confusion: while "PC" originally described any personal computer regardless of brand, the IBM Personal Computer's use of the name in its model designation led many to treat it as a brand.

Software Freedom and the End-User Revolution

In the 1960s, institutional and corporate computer owners were essentially forced to write their own programs to accomplish any useful task. The personal computer shattered that constraint. Today, the vast majority of end users simply install commercial applications or free-of-charge freeware—often built on closed, proprietary codebases—or they turn to free and open-source software whose source code is publicly available. Software is delivered in ready-to-run binary form, and it is typically developed and distributed by companies entirely independent of the hardware or operating system manufacturer. This independence stands in sharp contrast to mobile systems, where software is often restricted to a manufacturer-supported channel and end-user program development may be actively discouraged. While practically no personal computer user needs to write code to get work done, the ability to develop one's own applications remains fully feasible. The shift from a world where computing meant writing programs by hand to one where word processing, web browsing, e-mail, spreadsheets, file management, and video calling are off-the-shelf activities represents one of the most profound changes in how people interact with technology.