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How can I rest my geller et 6600 after it's been unplugged ?

My geller et 6600 has been unplugged and lost everything, all it does is show ! And "a" with a curly tail when I press any key. I don't need a full program just want to use it as a calculater/spare till.
Appease can anyone help
Thanks
Nat x
Nat, February 2015
The ET6600 is an odd model so there isn't much information.
One of the users has the programming manual so that will have the full reset procedure:

https://the-checkout-tech.com/manuals/cashregisters/Towa_ET-6600_and_Geller_ET-6600_operating_and_programming_manual.html

Registerman, February 2015
link Click here to see other fixes for Geller.