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sam4s er-290 cash register ?

can't get key to go to program mode. Can turn key to every position but program.
Mike, May 2014
You need a program key simple as that

Richard, July 2014
You have the wrong key. Insert the one with a 'C' written on it

Registerman, May 2014
link Click here to see other fixes for Sam4s ER-290.