3 ms·
I can confirm, the 28C actually shows the 4 (viewable) registries of the stack, numbered on the left as: 4: 3: 2: 1: So, if you input 4 [ENTER], 3 [ENTER],
by jaclaz 4y ago
I can confirm, the 28C actually shows the 4 (viewable) registries of the stack, numbered on the left as:
4:
3:
2:
1:
So, if you input 4 [ENTER], 3 [ENTER], 2 [ENTER], 1 [ENTER] you have:
4:4
3:3
2:2
1:1
But if you input 4 [ENTER], 3 [ENTER], 2 [ENTER], 1 you have:
3:4
2:3
1:2
1
if you then press +, you get 3 in both cases, which is the sum of the bottom two lines in the display.
Those are either the same as the "old" x and y registers or the sum of last input and the bottom register, same as the old x.