I was looking at an HP-42S ROM image today, and in the section with all the messages (starting at byte offset 0x7656 in the rev. C ROM), I noticed the message "No Variables".
Just curious - does anyone know when this message is used? I know about "No Menu Variables", "No Real Variables", "No Complex Variables", and "No Matrix Variables", but I don't recall ever having seen "No Variables".
I also noticed "Global Span", which I'd never seen my 42S utter in anger, either. Took me a moment to figure that one out. :-)
- Thomas