HP48G Connectivity Method in 2022

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Late to this thread, but I can report the exact same issues as TomC with ConnKit4 on WIndows, it allows xmodem transfers with the custom XSERV library installed but does not do backups.

Instead I used HPComm a "HP 48/49 PC link kit"

https://www.hpcalc.org/details/3713

This works in Windows 11.

I am connecting a HP48G and using a CH340 based USB serial cable. (I already had installed working drivers for that) connecting to the HP serial cable.

Just ensure it connects on COM1-COM4, if it is higher you'll have to uninstall other serial devices until a lower COM port is available (then reinstall/reinsert you HP Serial cable and check in Devic Manager that it is assigned a low COM port number)


The program works with default HP Calc settings, you just press right-shift and right arrow on the HP48G to start the communications, when you do a backup it automatically switches to ASCII mode. You can also drag and drop between the PC and HP48G.