The purple/violet was usually the color to refer to the keyboard, whereas green was code for 'mouse'. As I recall you had the usb to ps/2 adapters for attatchi

The purple/violet was usually the color to refer to the keyboard, whereas green was code for 'mouse'. As I recall you had the usb to ps/2 adapters for attatching legacy peripherals, but those usually came with two female ps/2 leads, a green one and a purple one, connecting to the one male usb-A.