Geeze, I remember all these old computers. Fun to be reminded of them.
I still have a Commodore PET. And a Timex Sinclair 1000. A few years ago, I brought the Timex into school and put it in our engineering display cabinet. Interestingly, my boss saw it and realized he had one too. So now we have two of these things in our display cabinet.
But maybe the best computer artifact I have is one of the first transistors ever made. My office mate, Dom, is an elderly EE who retired from Bell Labs. He worked at nearby Murray Hill, NJ where the transistor was invented. In fact, he was one of the junior engineers working with Bardeeen, Brattain and Shockley when they devised the transistor (and won the Nobel Prize). After they made and tested a variety of custom prototypes, they decided to run a small production batch of about 500 in a Bell Labs production facility (in Allentown, PA). After the first batch was tested they went on to produce improved versions. That first batch was disposed of.....except of a handfull that Dom kept. He gave me one of those first production transistors a few years ago. Kinda cool.