[time-nuts] Re: Ryzen mobos with serial port for Garmin GPS?

[Bill Dailey]

There is significant jitter using USB for timing.  Has been done poorly for a long time.  Well known.

Bill Dailey

Negativity always wins the short game. But positivity wins the long game. - Gary Vaynerchuk

Don’t be easy to understand, 
Be impossible to misunderstand 
- Steve Sims

> On Nov 5, 2021, at 1:33 PM, Andy Talbot <andy.g4jnt at gmail.com> wrote:
> 
> Use FTDI USB serial ports - you can't go wrong with them.
> https://ftdichip.com/
> 
> I have, at the last count, used something like 200 of their FT232 device in
> one form or another on the shack PC.   I know that, because device manager
> has registered up to COM200.  Every time a new one is plugged in, a new COM
> port is set up.
> 
> Andy
> www.g4jnt.com
> 
> 
> 
>> On Fri, 5 Nov 2021 at 18:26, Alec Teal <alec at unifiedmathematics.com> wrote:
>> 
>> A friend of mine who lives and breaths this stuff (I wont tell you what
>> he does - but suffice to say he's authoritative) basically said to me on
>> something about serial ports that you can't go wrong with USB stuff,
>> even on Linux.
>> 
>> Would that work?
>> 
>> Serial ports certainly are getting scarce! You'd get 2 to a board an
>> embarrassingly long time ago!
>> 
>>> On 05/11/2021 06:10, Darren Freeman wrote:
>>> On Thu, 2021-11-04 at 22:36 -0700, Rich Wales wrote:
>>>> However, mobos with a serial port are becoming harder to find.
>>> That's not really been my experience, they just moved it to a header.
>>> You will need to supply a DE9 to ribbon cable, say on a bracket, or
>>> installed in a cutout elsewhere in the case.
>>> 
>>> This is the first one that I checked, and it has such a port labelled
>>> COMA, along the left/bottom edge.
>>> https://www.gigabyte.com/Motherboard/B450-AORUS-M-rev-1x/sp#sp
>>> 
>>> Also note that the Linux PPS driver supports the standard PC parallel
>>> port, which you can usually find as a header. If you are having
>>> performance issues with one, try the other. (But you may need to supply
>>> negative-going edges to the parallel port.)
>>> 
>>> 
>>> Have fun,
>>> Darren
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