HP48GX RAM card design

[mfleming]

(06-22-2017 12:15 AM)EugeneNine Wrote:  The ram looms to be only $5 so I'll order a couple next time I make a digikey order and once I have them make a board and try it in my SX.

I'd love to see if this design would work in an SX! I pulled mine from mothballs a while back, along with a TDS memory card. It had a CR2016 holder that allowed the coin cell to be replaced while the card was in the SX so that RAM content was not lost. Perhaps in lieu of programmatic bank switching, the address switches could be moved to the interior to make room for the battery?

~Mark