Heya and welcome here.
Also how was HP programming way back then? Did the calcs use SysRPL like some of the late 90's calcs? IIRC, you use the stack a lot with that language, so if you still remember how to do so, maybe this could be handy if you ever decide to learn assembly.
(although there are plenty of alternatives on newer calcs)
Which calc did you use by the way?