You still have your ADM-3A!!?! Wow. I built one of my own from the kit that Lear Siegler offered, around the time I also built my Altair 8800 from kit. (I was WAY TOO POOR to just go buy assembled stuff at the time.) It was so wonderful to have that ADM-3A. I don't even know where it went, now.
Now that brings back pleasant memories. I used that thing like crazy for years. It saved my life when writing programs under CP/M, for example. Or using Microsoft's paper tape BASIC. (Hmm... I bet I still have a Persei drive maybe and maybe also some old 8" floppies with Microsoft's BASIC on them.....)
hehe. The mechanisms aren't as impressive as the 35. But it's nice to see that. I never used or saw a 28, though. Thanks!
I still have my old DECtapes in plastic cases around here -- no tape drive for them, though. So there they sit.
I'm going to build another tape reader and tape punch, though. The reader is easy. It's the punch dies for the tape punch that will set me back, time wise. I think to think about the design some more. But I want to design, make, and build that project. My son would benefit from it and I'd enjoy it.