First IBM Personal Computer Launch

On August 12, 1981, IBM announced the IBM Personal Computer at a press conference at the Waldorf Astoria Hotel in New York. The device, built around Intel's 8088 processor and running Microsoft's MS-DOS operating system, represented Big Blue's first serious foray into personal computing—a market the company had largely dismissed until then. IBM, which had dominated mainframe computing for decades, had watched from the sidelines as Apple II and Commodore PET machines captured hobbyists and small businesses. The IBM PC changed that calculation.

The machine itself was technically conventional for its time. It featured 64 kilobytes of RAM (expandable to 640KB), a 5.25-inch floppy disk drive, and a monochrome display. The processor speed of 4.77 MHz would seem laughable by any subsequent standard. But IBM did something its competitors hadn't: it published the technical specifications and left the architecture open to third-party developers. This decision would prove more consequential than the hardware itself.

Philip Don Estridge led the project from IBM's Entry Systems Division in Boca Raton, Florida, working under a deadline that pushed IBM to outsource critical components rather than build everything in-house. Microsoft provided the operating system; Intel supplied the processor; other vendors filled in peripherals. This distributed approach meant IBM couldn't lock down the market the way it had with mainframes, but it also meant the PC ecosystem could grow rapidly without waiting for IBM's approval.

The price tag was $1,565 for the base model, roughly equivalent to $5,200 in 2024 dollars. Despite the cost, early adopters—particularly in business and financial services—snapped them up. The IBM PC wasn't the first personal computer, and it wasn't the most powerful. But it carried IBM's reputation for reliability and its sales force's ability to reach corporate purchasing departments. Within two years, IBM PCs were appearing across American offices.

The real impact came not from the original machine but from what it enabled. Clone makers like Compaq, Dell, and later countless others could build IBM-compatible machines without designing from scratch. By the late 1980s, the IBM PC architecture—by then known as the x86 standard—had become the dominant platform in personal computing. The company that invented it would eventually cede market leadership to cloners, but the architecture it unleashed still powers most computers today.