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sales tax change from 7% to 6.875%?

I have a JCM GOLD-2250 electronic cash register how do I change the sales tax from 7% to 6.875%
Village Hardware, January 2017
You may find help here:

https://the-checkout-tech.com/manuals/cashregisters/JCM1.php

XXX, January 2017
link Click here to see other fixes for JCM.