Have you seen the Psion Workabout's, have a look on the Psion web page
www.psion.com.  They can supply a Psion Workabout with 2mb memory etc.

Hope this helps

Andrew

Mark Newland wrote:

>     I have a project that stores both calibration info and data logging
> information on it.  The product will be firmly fixed inside the cab of
> 18 wheelers.  The information will only be accessed once per month.  The
> options are:
>
> 1) Run a 200 foot extention cord out to the unit once per month.  No, I
> can not leave the cord laying out accoss the middle of the parking lot
> for hundreds of trucks to run over it.
>
> 2) RF Link:  Plausible but too expensive when talking about 20-100
> trucks per fleet.
>
> 3) Have the customer buy a laptop and run it out to the truck whenever
> they need to and plug it in.  Customer said "NO!".  They would prefer a
> small handheld unit that will capture the information and can then
> download it to their PC.
>
> 4) Build my own PDA and use whatever IR communication protocals I want.
>
> 5) Buy someone else's PDA (like a Palm Pilot, Handspring, etc.) and just
> program it.
>
> The last option sounds the best but have no idea how to interface to
> it.  What is the spectrum frequency of the IR emittor and detector
> (IrDA)? What is the baud rate on the transmission? When I want to send
> the letter "A" to the PDA, what does the waveform look like?
>
> Unconfirmed info that I have found so far is that it uses 9600 baud and
> it sends a packet of 64 bytes at a time.
>
> Writing the program for the PDA is the easy thing.  What do I do on the
> PIC side to make it compatible??