Basic questions about HP-41c

[Dave Britten]

If you assign a user key to a global label (i.e. a program you've stored in memory), then the key assignment is actually saved as part of the global label, and will be written to the card. If you read the card back into memory while USER mode is activated, then the global labels in that program will be loaded with any user key assignments intact. (I don't remember if USER mode has to be activated when writing the card - I think it's only when reading it back.)

Note you can have multiple global labels each with its own key assignment within a single program space (i.e. between two ENDs), so you can write a few small programs with key assignments to a single side of a card. Assuming they are small enough to all fit together into 112 bytes, anyway!