geekhack

geekhack Projects => Making Stuff Together! => Topic started by: netdudeuk on Fri, 27 May 2016, 12:41:51

Title: PS/2 keyboard signals on scope
Post by: netdudeuk on Fri, 27 May 2016, 12:41:51

Hi

I have a USB keyboard that works fine when plugged into a PC via a USB to PS/2 converter.

I'd like to analyse the PS/2 data line but there's nothing to see on the scope when either the keyboard powers up or when keys are pressed.

I doubled checked the connections.

What am I missing ?

Thanks

Title: Re: PS/2 keyboard signals on scope
Post by: netdudeuk on Fri, 27 May 2016, 13:17:42

Ok, answering my own question, you need some pull ups on the data and clock lines.

4.7K works ok.