The original IBM PC also had two identical 5 pin DIN connectors, one used for the keyboard, the second for a cassette recorder interface; the two were not interchangeable. The smaller mini-DIN connector has been variously used for the keyboard and two different kinds of mouse; older Macintosh family computers used the mini-DIN for a serial port or for a keyboard connector with different standards than the IBM-descended systems.
The original IBM PC featured two identical 5-pin DIN connectors: one for the keyboard and another for a cassette recorder. These were not interchangeable. The smaller mini-DIN connector has been used for both keyboards and different types of mice; older Macintosh computers utilized this connector for either a serial port or a keyboard connection with differing standards from IBM systems.