>For a "bottom-end" wand scanner (for example,
> http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2004/mtf23/BarcodeScanner/index.htm
>ATMega based, not PIC based -- sorry!) or a CueCat, the scan
>is assumed to be linear (the movement of your hand), with very
>simple mechanical and processing requirements.  Thus, relative
>time is directly translated into bar width / spacing.

For those who haven't looked into doing this, there is an extremely good 
description of how to handle decoding a barcode from a hand held wand, in 
the original Motorola 6800 Application Manual (issued late 60's, early 
70's), where they 'design' a POS terminal to illustrate various applications 
a micro can be put to. The section in that on barcodes was my introduction 
to them, and still is deemed a useful reference manual. 

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