[RWebb]

ok, old story ...

in the late 1970s, I had a 67 with the magnetic card reader and had it programmed with all sorts of equations for my field work, but had to read the cards to load the programs and process the data.

IF it got cold, it would not run the mag cards thru.

You may have heard of skiers and winter campers having to warm up their tiny stoves under their arms or in their crotch to cook.

I had to do that plus warm up the caclulator (or rpn based hand computer) the same way to use it.