PS2 controller

Is PS2 controller protocol standard for all the manufacturers? I have interfaced SONY PS2 with ATmel controller, now want to use Logitech PS2.
I have referred following tutorial for SONY PS2 controller and it works...
https://store.curiousinventor.com/guides/PS2/

Will the same protocol applie to any other PS2 controller?

does the Logitech work on the playstation?

i think when Logitech says ps2 they may be talking about the keyboard/mouse plug on the back of a PC which is way different: https://en.wikipedia.org/wiki/PS/2_connector

ultimately im pretty sure if a controller has the funny playstation plug on it, it will follow playstation protocol...

yup.. one of my friends has logitech playstation.....
so you mean to say the same protocol should work for logitech playstation as well?

yes, if the plug is the same shape