HP48 card PCBs - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: General Forum (/forum-4.html) +--- Thread: HP48 card PCBs (/thread-17803.html) |
HP48 card PCBs - DavidG - 12-08-2021 08:58 AM Some years ago there were hobbyist-produced RAM cards for the HP48 line. I got my hands on one of these and I seem to have lost it. Has anyone ever documented any of these cards? I'd like to see about crafting my own. RE: HP48 card PCBs - mfleming - 12-08-2021 12:32 PM You can find one example in my github repository here https://github.com/mafleming/HP48RamCard A commercial version of a card is discussed in this thread https://www.hpmuseum.org/forum/thread-17140.html Somewhere else in the forum is a thread where a member posted a clever solution using a stack of thin PCBs to get a physically correct memory card shell. ~Mark RE: HP48 card PCBs - DavidG - 12-08-2021 11:16 PM I was thinking mainly of this design: https://www.hpcalc.org/hp48/pc/pictures/kk2048.jpg The one I lost is of this design with fewer chips populated. I think this one (https://www.hpcalc.org/hp48/pc/pictures/stolte20.jpg) is the stacked PCB design. RE: HP48 card PCBs - GreyUser - 12-15-2021 03:32 AM I have a 128kb and 512kb card of the stacked board construction shown (actual layout slightly different). It too has the glue logic chips tops sanded/scratched off but I would expect it wouldn’t be too difficult to reverse engineer them. What info are you looking for? Schematic? Other? |