Perhaps of limited interest, but I was interested in the fact that a computer science guy wouldn't go straight to ASCII instead of Baudot. I think some have already done this with a Pi, but here's a different approach. Page 200 (PDF page count 205) https://drive.google.com/file/d/1wxgSuDSox444BmtaV2UNkyy4EYu6UfEO/view -- John, W9DDD