HP 48 Series -- interseries compatibility?

[rprosperi]

Even if you add in the missing commands using replacements from John Meyer's routines into your device, you will have to recompile the programs that utilized the missing commands as the saved programs you transferred have the original ROM/library addresses compiled into them, which is why they are throwing the missing XLIB error.

Look at the original source code for the programs having these errors and compare to how the code looks on the 48S where you'll see the XLIB reference where each of the missing commands should be; this will reveal which commands you need to replace. Once they are in the 48S, recall the code, edit it to change the XLIB commands to the new command name (as seen in the original code and also the new one you created) and then save the revised program to new name (to save your old one in case of errors). Once you've got them all working, you can change the program names back to the original ones.

hth