it may well have come with an adapter for a 9-pin RS232 serial port. Those mice from a decade or more ago would have contained the software to recognise the interface into which they were plugged ...

Old Macs used the serial port for printers. Also known as an RS-232 port, serial ports provide very slow speeds and have been superseded by USB on desktop computers. USB-to-serial adapters are ...

Works for console port this USB to rj45 console cable Replaces COM port RS232 (DB-25/DB-9) serial port perfectly ... 3com compatibly. The pinout names Cisco usb console cable USB2.0 ...