Originally Posted by Jope
Loads of fake prolific chips floating around. The fakes don't handle bidirectional comms at all, throwing garbage bytes into the rx stream (from the computer's pov).
This one worked:
This one didn't and has the garbage bytes problem as verified with a terminal connection:
I could manage to get mine working for file transfers with NComm and ZMODEM transfers, but it was a special kind of hell everytime I had to transfer a big file. And I won't tell you how many times I had to retry with TYPE SER: to get NComm over first (adding some padding at the end using a tool I found).
Anyway, it's off-topic