IBM 1401: The Mainframe
In 1959, IBM introduced the 1401, the first high-volume, stored-program, core-memory transistorized mainframe computer.
Its versatility in running enterprise applications of all kinds helped it become the most popular computer model in the world in the early 1960s.
IBM also introduced the 1403 chain printer, which launched the era of high-speed, high-volume impact printing.
The 1403 was unsurpassed in quality until the advent of the laser printer in the 1970s.
The 1401 was the first computer system in the world to reach 10,000 unit sales.