[GreenKeys] Usb adapter

[Harold Hallikainen]

>From the schematic, it looked like it was originally a PIC chip (port
names, ICSP, etc.).

On Xon/Xoff, is it possible that it does eventually work, but there is a
delay? I've seen some systems respond to Xoff by stopping putting stuff in
the transmit FIFO, but the FIFO continues to be transmitted. Then there
were the early UART chips (I think the AY5-1013 and 6402 did this) where
CTS going false immediately stopped transmission, including in the middle
of a character.

Nice work!

Harold
https://w6iwi.org