Have you used your calculator for something that was not really math related?

[EugeneNine]

I always wanted a memory card, never was able to get one, I see them on ebay or amazon but lots of $$$.

Its easy enough to make a pcb now a days I wonder if I could just make one.

Serial is not a big deal, $10 generic USB-serial adapter works fine. I use it for my tek scope too.