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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

Geller Office Appliances, Cash Registers

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

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