On a friend's recommendation, I recently bought the Altair 8800 Pro Emulator Kit, the Altair Duino, and assembled it. This video demonstrates using the assembled Altair Duino, with my Tandy 4825 SX running OS/2 serving as a terminal.
I also provide an overview of the kit itself, describe the build process, and show pictures of the kit while I was building it.
Jump to 5:36 to skip the overview and see the thing in action. Jump to 11:37 to see some pictures of the build. The camera's auto focus started to go nuts around the 9:00 mark; I apologize for this.
You can find more information on the kit, as well as buy it, at Adwater & Stir:
https://www.adwaterandstir.com/altair/