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Author Topic: PS/2 keyboard signals on scope  (Read 1221 times)

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Offline netdudeuk

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PS/2 keyboard signals on scope
« 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
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Offline netdudeuk

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Re: PS/2 keyboard signals on scope
« Reply #1 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.
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