HP45 stack logic problem

[rprosperi]

(04-14-2014 05:02 PM)Commie Wrote:  Again start with,

0=t
30=z
30=y
35=x

Now press 3 2ndf Y^x(hence 35^3), and the returned stack is,
30=t
30=z
30=y
answer in x

when in fact the stack should be
0=t
0=z
30=y
answer in x

I appreciated the complications and difficulties involved trying to explain this but I would be interested in any answers given.Thanks for your time.

Cheers
Commie

As Jake pointed out, when you press the '3', the stack lifts, moving 30 up into the t register (and the others lift as well). Subsequent to that, when the stack drops after the power function, the t register auto-copies (30) into z, z to y, etc. So the result is indeed what should be expected.

Why are you expecting 0's in the t and z registers? Where would the 0 come from?