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dalek · 27 July 2018, 08:20

I think all those mouse port pins are active low - so e.g. pressing a button drags the signal to ground. Same with the pulsing for movement I think - move the mouse while checking and you should get approx half the voltage when measuring (or check with a scope).

What are you using to power your regulator (-12V? from the ATX?) and did you add the capacitors like in the datasheet? Ian's ATX adaptor uses the same regulator and has the necessary caps.

27 July 2018, 08:20	#21
dalek Registered User Join Date: Nov 2014 Location: NSW/Australia Posts: 462	I think all those mouse port pins are active low - so e.g. pressing a button drags the signal to ground. Same with the pulsing for movement I think - move the mouse while checking and you should get approx half the voltage when measuring (or check with a scope). What are you using to power your regulator (-12V? from the ATX?) and did you add the capacitors like in the datasheet? Ian's ATX adaptor uses the same regulator and has the necessary caps.