JohneL

Broke out my old HP12C to work out a ‘change date’ problem. It churned but gave me the answer I needed. Out of curiosity, bought the HP12C app then ran the same problem on my iPhone 15. The answer appeared instantaneously. Initially, I missed the ‘crib notes’ that are on back of the original calculator. I subsequently found them in the ‘Menu’ under ‘Helpful Settings’.