My mother has used the same Canon P28 electronic calculator for 30 years. She recently received a used wifi printer from a family member and upon syncing this printer to her computer, the calculator spit out a page with 'Windows Printer Test' on it. Just to clarify, the calculator is a 120v powered desk top calculator that pre-dates wifi and Microsoft Windows itself and has no external data or radio signal connections.
Any ideas? Pictures to follow.....