Didn't those adapters exist in both directions? Green in one and violet in the other? I have the feeling if I started to dig in my treasures I should still find some. One way to avoid e-waste is not to throw anything away...
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.
I knew that, and know most of the colours, but it's only now that I realise plugs on VGA cables are blue to match, plugs on DVI cables are white to match, and even my cheap USB-to-serial adapter has a teal RS232 plug.
