I had a home brewed ram expansion board (still do actually, in a box somewhere...) I powered everything up a couple years ago when my kids found it and asked what the heck it was. Still works

My original VIC 20 machine that I had in the 80s still works as well, but a few things have been replaced along the way. I still have the same 24K expansion cart that my Dad built 40 years ago and it also still works.