I've been working on reproducing the MITS 88-UIO board. This board provides one serial I/O port and an ACR cassette interface. Deramp has produced a few video's demonstrating this board (link below). The board is a nice solution for adding a terminal and cassette to the Altair 8800 but is quite rare, so I decided to reproduce the board. I am nearing the finish line with the board design and will be ordering a prototype to verify the design. If it goes well, I could order a batch of production quality boards for sale. Depending on how many I order I will sell them for $40-$50 USD.
I would like to get an idea of the interest level so please respond if you might be interested in buying a board.
Mikes 88-UIO demonstration:
https://www.youtube.com/watch?v=1edCOd68iGI
Thanks!
Perry