How to power a PS/2 keyboard without a PC?

Question

I want to power a PS/2 keyboard and be able to switch on/off the 3 led lights (caps, num, scroll) I tried to supply 5Vdc to the keyboard from an external battery or regulated power supply, but after pressing Num/Caps/Scroll led lights did not light up.

Is the status of these lights is controlled by the timing/data signals?

Any circuit design or kit or device on the market that make the keyboard led lights operate as they are connected to a PC?

(please do not ask why I want this weird application) Thank you in advance

Answer 1

The status of the lights are controlled from the computer.