I'm trying to find a way to read/write Altair tapes on the Altair-Duino (an Arduino Duo-based clone). Since the Clone's cassette board already produces tones in the correct frequencies, I was hoping to use it. I can't find details of the interface to that board. Is a detailed schematic available? Any description of the interface would help above what is in the ACR manual on the Clone website.
Thanks for your time!