USB spec (was Re: Serial interfaces (was Re: Any former Psion 5 owners

Tony Duell ard at
Tue Jul 27 14:54:59 CDT 2010

> The complete USB 2.0 and 3.0 specs are available on
> I think it contains all electrical and protocol specifications.

Thanks... I've skimmed the USB 2.0 spec, and to be honest it does appear 
to be ridiculously over-complicated for anything I need to do. I suspect 
this comes from making a 'universal' interface that could handle 
everything from keyboards to mass storage devices to printers to ... 
(which IMHO was a mistake...)
But anyway, I'll remember where the docs are in case I have ever to work 
with it..


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