This Day in American History: The IBM PC Launches
- ForAmerica
- 6 minutes ago
- 2 min read
On this day in 1981, a beige box unveiled at a New York hotel ballroom turned personal computing from a hobbyist curiosity into something every American office, and eventually every American home, would eventually need.
By 1980, IBM had spent decades dominating room-filling mainframe computers, but William C. Lowe, director of IBM's lab in Boca Raton, Florida, saw the winds shifting toward smaller machines for small businesses and ordinary consumers. He got the green light to build one fast, and a secret engineering team working under the codename "Project Chess," led by Philip Don Estridge, delivered a finished machine in about a year -- lightning speed by IBM's usual standards.
On August 12, 1981, Estridge unveiled the result at New York's Waldorf Hotel: the IBM Model 5150, officially the IBM Personal Computer. It ran on a 4.77 MHz Intel 8088 processor, started at $1,565 with just 16 kilobytes of memory and no disk drive, and came bundled with two programs -- VisiCalc for spreadsheets and EasyWriter for word processing. Rather than build the whole system in-house, IBM outsourced the operating system to a small Seattle company called Microsoft, and made the machine's architecture openly documented rather than locking it down.
That decision to publish the specs, made mostly to get the machine to market faster, ended up being the single most consequential choice in the whole project. It meant any manufacturer could build hardware and software for the platform -- and eventually, build entire computers that ran the same software, known as "IBM compatibles" or "clones." Compaq released the first true clone in 1983, kicking off a price war that both exploded the personal computer market and slowly eroded IBM's own share of it. By the end of 1982, IBM was signing up a new retailer every week, and at the platform's peak popularity, PCs were selling at a rate of one every minute of the business day.
The 5150 itself was discontinued in 1987, but its legacy never left. Every Windows PC running on an Intel or AMD processor today is, architecturally, a direct descendant of that beige box unveiled in a hotel ballroom -- and the word "PC" became permanently synonymous with personal computing itself.
Also on this day:
1939 -- "The Wizard of Oz," starring Judy Garland, has its Hollywood premiere.
1944 -- Joseph P. Kennedy Jr., eldest son of Joseph and Rose Kennedy, is killed when his aircraft explodes during a secret WWII mission.
1990 -- Paleontologist Sue Hendrickson discovers the fossilized remains of "Sue," the most complete T. rex skeleton ever found, in South Dakota.
1994 -- Stephen Breyer is sworn in as a U.S. Supreme Court justice.
A beige box, an outsourced operating system, and an open design nobody thought twice about -- and personal computing was never the same again.
Source: IBM, Computer History Museum, Smithsonian National Museum of American History
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