I've an HP-41C, that was purchased in my Freshman year in engineering school. It's OLD...but, but I've grown a bit attached to it (got me through 4 years of engineering school...and now through almost 20 years of work and
kids). Still works great, and I know the system backwards and forwards.
Question: Over the past few months, the "flag" feature of the calculator has not been correct. Specifically, flags higher than 30 (31 through 55)are shown as "non-existant". Flags 00 through 30 are fine. What could be the problem, and how do I get it fixed? The calculator was purchased in December of 1983....so realize it's a bit of a "classic". Would appreciate any help that you could offer.