Oops! hp42s Mohr's Cicle Program

[Jean-Marc]

Aha! that's what's happening, thank for the clarification. Correct me if I am wrong:-

CLST resets stack T Y X to zero
STO M stores 0 from stack
STO N stores 0
INPUT M brings back the M stored 0 before entering 70,000
INPUT N brings back the N stored 0 before entering -30,000

HP 35s calculator behaves differently the stored number will need a recall command first for this to happen. INPUT places the number on the stack, that's probably why T=0 in this case.

PS: Checked my android version again and got the same answer as the T5. Difference is only between 35s & 42s apparently. Maybe you can try other models Hp32sii 33s etc...