Hi, Olaf;
I finally found my printed version of Wickes' "Synthetic Programming on the HP41C" and then I see what happens. (Yeap, I have a copy of it in the MoHPC CD/DVD set, but I do not like reading 'on screen' text...)
A bit of history: I remember once when a friend borrowed my HP41 and was completely frightened when taking it back to me because he thought he broke it. He was working with summations and pressed [Sigma-] many times while in USER mode, and the calculator crashed in a way it didn't turn on anymore.
I clearly remember having the Bite Grabber ("byte jumper", at that time) assigned to [Sigma-] instead og the suggested [Sigma+} so I had it in a safer, shifted key. Not any safe as long as USER was on, thought!
I had no difficult changing the Byte Jumper position in the keyboard when following the instructions in Wickes' book, and I wrongly assumed it would be easy as well with the ones found in the MoHPC section. Surely the instructions to create the byte grabber in the MoHPC page are easier and shorter than the ones found in Wickes' book, and I'll look at them closer to see how one can change the key where the byte grabber is assigned to.
A brief comment: IIRC, when assigned to the [Sigma-] the byte jumper forced 'XROM 00,08' to be shown in the display when the [Sigma-] key was held long enough it could show its assignment.
Best regards.
Luiz (Brazil)
Edited: 3 Sept 2006, 10:47 p.m.