It is very difficult to find information on the Sharp ER-1911 now. I don't have error notes for this model. All I can suggest is an online manual such as here:
http://the-checkout-tech.com/manuals/cashregisters/Sharp_ER-1911_operating_manual.html
what ia sharp er1911 prog manual
http://office.manualsonline.com/manuals/device/personal_computer.html
personal computer manuals
there is an alphabetical list
hope this helps
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