At the time, we suspected that some problem had occurred which was preventing it from proceeding with the plan, and I made a note to follow up on this when the relevant reports would be published in the #PDSAnalystNotebook .
@tom30519@PaulHammond51
I built a weather fax decoder with that ZX81, but the hardest part of it was getting the simple A-to-D decoder properly triggering to maintain sync. A few years later re-coded it in M68000 assembly, and then in C: