Bug in the HP-41 with R/S and stack lift

[Roland57]

(11-05-2020 05:57 PM)Didier Lachieze Wrote:  Here are the results with also what is mentioned (or not) in the manual for each calculator :
...
HP-55 5 Neutral Neutral operations Appendix B : Additional Operating Information
not described

On page 82 of the hp55 Owner’n Handbook there is an interesting statement:

“Pressing any key( even accidentally) halts program execution. If a program has been stopped by pressing a key, be careful not to restart program execution in the middle of a digit entry key sequence within the program or between a prefix key and the corresponding operation. Use BST or SST to reposition the program pointer in either of these cases” (bold typeface by me)

I think, it describes the discussed problem clearly.

Roland