[GreenKeys] Usb adapter

[ad7i]

Re slow stop to Xoff command.

I thought that might be a problem, but in using a serial protocol monitor I
don't see that issue.  I see multiple Xoffs  going to the host computer and
in those cases when it doesn't seem to respond to Xoff, it never stalls its
output, it just goes on like it never saw an Xoff.  In cases (combo of OS
and USB-Serial bridge chip) where the XonXoff does work, the output stops
in less than 3 chars, even at 19200..

On Fri, Dec 10, 2021 at 10:03 PM Harold Hallikainen <harold at w6iwi.org>
wrote:

> 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
>
>
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