Xcas Syntax / Prime Syntax (in particular computing in Z/pZ)

[Stefan]

Thank you parisse for the %% hint!

Is it intended that the Prime converts the expression 12%%13 in the history to %%(12,13)? That's a little bit confusing, because if I copy this to the entry line it is again converted back to 12%%13. However if I type it like its in the history and execute it there is an error.

Also: I am not familiar to the HP38. How do I know whether a command is one of the "genuine HP38" commands and which not?