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

[hth]

I found another bug in the HP-41. It enables stack lift when starting a program which means that the following program:

Code:


8
ENTER
9

If you interrupt the program (press the R/S key) at the 9 line, you have just executed ENTER and have the stack lift disabled. If you now press R/S again to continue running, you will end up with:

Code:


8
8
9

on the stack.