HP-41C disk drive.

[geologie]

I have some questions about re-learning the operations of my beloves HP-41 claculator and accessories. I just restart the HP-IL disk drive but...

1- I can list the programs i made decades ago on some of the disks and i can copy programs individually on the calculator but there is also some type of backup files i'm interest in but can't find the command in the drive user manuel. Where are the commands description of that disk as the manual is really thin about them, no backup and restore options in the original manual...

2- Some of my disk are mark, by myself, as LIF and other are NON-LIF. I can read and copy from them without difference, why did i wrote that on my disk in bold black?

3- At the time i use that calculator, i had a 8-bit XT computer HI-IL interface card but can't find any computer that will accept it anymore. I also read on this forum that there is a kind of USB gadget that can be use insted of this old card, where can i have info on that USB interface?

Thanks!