Might contact eBay vendor to purchase manual.
https://www.ebay.com/itm/Vintage-Casio-CQ-81-Made-Japan-Computer-Quartz-Calculator-With-Box-Not-Working-/254181294424
http://world.casio.com/wat/download/en/manual/
Use this page to download a copy of CASIO watch manuals in
PDF format.
To download a PDF file, enter the four-digit (or three-digit)
module number marked on the back cover of your watch.
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