program overlay for samsung er-650?

You can just make one. There should be a picture of it in the manual, so just cut a piece of paper to the keyboard size, rule out the squares on it, then copy the layout of the sheet onto it from the manual
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If anyone needs a Samsung / Sam4s ER-650 manual,
try here:

http://the-checkout-tech.com/manuals/cashregisters/samsung1.php

Many more available http://the-checkout-tech.com

Mark
March 2010