> I would think that USB is not inherently worse than a
> hardware RS232. Both have some interrupt latency, but it's
> small in both cases. USB has to handle audio reliably
> at no worse than 8kHz sampling rate.
Using isochronous USB enpoints, yes. USB-to-serial converters and probably
whatever they put into USB GPS receivers no doubt use bulk endpoints with
slightly more non-deterministic buffering on both ends of the wire.
Randy.
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