> Thanks for that.  I shall study the '1938.  I hav to admit that I find it=
 very
> difficult to select microchip products.  It would be really usefull to ha=
ve a
> chart showing the evolutionary path of the various chips.

If you go into the Microchip website you can select devices to compare so y=
ou can see just how the features match up.

e.g. start here http://www.microchip.com/ParamChartSearch/chart.aspx?branch=
ID=3D1002&mid=3D10&lang=3Den&pageId=3D74 and select your desired package si=
ze in the 'pin count' column.
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