Tp4 haz 2x ergodox on 2 diff main'puters.
Tp4 has over 30 operational computers in all, 50+ in parts..
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So you use something other than an Ergodox, with a PS/2 interface? Seems implausible.
What are we considering PS/2? Straight up pure PS/2, or with the use of adapters? I haven't used a desktop at work at all since they took my old one away, so very few systems I use at work even have that interface baked in and I sometimes have significant irritation trying to get PS/2 actually functioning in modern iterations of Windows (seemingly depending on the hardware involved). Linux usually seems pretty plug and play.
It is always nice just being able to use PS/2 to free up USB ports and give the bus a break. I don't know that I have ever noticed anything more about it other than the novelty of using a nearly dead interface, which is inherently entertaining.