Here is a something that could work. It has a real serial port and you could add more ethernet controllers, uses very little power and cost only $60. www.newegg.com/.... <https://www.newegg.com/Product/Product.aspx?Item=N82E16813157497&cm_re=j1900-_-13-157-497-_-Product>
There are other boards like this that use the same J1900 CPU. I'm thinking about using this as th machine tool (milling machine) controller. On Tue, Feb 14, 2017 at 4:26 AM, Bob Camp <kb...@n1k.org> wrote: > Hi > > A direct port might be a +/- 100 ns sort of thing most of the time and a > +/-10 us > thing every so often under some OS’s. Most desktop operating systems are > not > designed to prioritize random pin interrupts. A dirt cheap MCU coded with > a few > (hundred) lines of assembly code may be a better option than a typical > desktop. > Complicating this further is the degree to which some OS’s can be directly > or > indirectly optimized. Install *this* package and it all goes nuts. Install > that package > and not much happens …. > > Bob > > > On Feb 13, 2017, at 11:07 AM, Ruslan Nabioullin <rnabioul...@gmail.com> > wrote: > > > > Hi, generally speaking, what are the performance differences between the > following: 1. direct RS-232 (i.e., what I believe is a standard PCI card > offering RS-232---essentially UARTs interfaced more-or-less directly to the > PCI bus); 2. RS-232 via USB; 3. PPS decoding PCI cards (which might also > have an IRIG input or even an onboard GNSS receiver). > > > > Thanks in advance, > > Ruslan > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > -- Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.