Vaughan Pratt wrote:
>
> >Let's be honest.. most wearables are built with desktop technology
> >scaled down to at minimum pc/104 scale..
>
> PC/104 was the scale of several years ago. One can make a wearable a lot
> smaller than pc/104 these days, e.g. if you don't insist on a blazing
> fast Pentium then the Matchbox PC (http://wearables.stanford.edu/)
> including 340 MB hard drive is 2.8" x 1.8" x .9".
>
> >but with such vast power requirements for hard drives, fast processors,
> >and displays that half your weight is batteries.
>
> About right. The Matchbox PC including 340 MB drive weighs 3 oz. and the
> full-function port expander adds another 1.8 oz (less for an expander
> that omits parallel and floppy ports). It runs for 5.2 hours on a pair
> of Sony NP-FM50 batteries each weighing 2.2 oz. The volume of the two
> batteries is a few percent more than that of the PC itself not counting
> the port expander. A pair of the considerably bigger Sony NP-FM950
> batteries runs it for at least 17 hours, I haven't yet flattened these.
Okay, you got me there, except:
This 7 oz box (3oz main board + 1.8 oz expansion + 2.2oz batteries)
doesn't include wireless network connectivity, or a display.. both of
which will likely at least double your power requirements, therefore
also doubling your battery requirements for just 5 hours of use.. making
it closer to 14 oz (or significantly more) by the time you get done,
even assuming a low power passive LCD arm mounted display.
Also, you can't buy one of these yet. :)
-Paul
--
R. Paul McCarty / 
/ x52059
317 Lattimore Hall, University of Rochester, Rochester, NY 14627
Life is nothing if you're not obsessed. -Pecker
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