To be frank, I had the HP-48SX, donated it and have gone back to my trust HP-15C (or reissues). For anything more sophisticated, I use a CAS on a computer, like

To be frank, I had the HP-48SX, donated it and have gone back to my trust HP-15C (or reissues). For anything more sophisticated, I use a CAS on a computer, like SymPy/Mathics or inside Jupyter.