SAVE and LOAD observations
Do this: SAVE RESET LOAD and there seems to be a crash (you can hardly see the message, the screen turns white, and you need EXIT to get the 43S to work again.
Variables are either not saved or not loaded - they vanish in this process. This may well be partially my fault since there is a command LOADV in the IOI, but this isn't mentioned on p. 159 of the ReM in the chapter "SAVE and LOAD". Documentation-wise, I'll take care of it.