HP-41C T register duplication disabling

[J-F Garnier]

(02-20-2020 06:28 PM)Ranieri Wrote:  

(02-20-2020 04:53 PM)David Hayden Wrote:  It's an interesting question. Suppose it was possible to disable T register duplication. What would you put in the T register instead?

In other words, suppose you key in
1 ENTER
2 ENTER
3 ENTER
4 +

What would you want the stack to contain?
T: ?
Z: 1
Y: 2
X: 7

Dave

Thank you for your reply, probably I would expect it to contain 0 just like the other registers.
Ranieri

That's how some other old RPN machines work. For instance on the Novus Mathematician, when you clear (drop) the x-element, the stack goes down and the top element is cleared. Almost like the RPL (although the Novus stack was *3* elements high).
Novus as a RPL precursor?

J-F