HP HP-25 - Page 48

emory Stack
the X- and Y-registers. It happened in the above example, but
let’s do the problems differently to see this feature more clearly.
First press [€E] to clear the X-register. Now, again solve 16 +
30+ 11+17=7
Stack Contents
0.00
0.00
0.00
|_16.
0.00
0.00
16.00
Press
16
16.00
0.00
0.00
16.00
30.
30
0.00
16.00
30.00
30.00
0.00
16.00
30.00
11.
16.00
30.00
11.00
11.00
16.00
30.00
11.00
17.
17
X <
N4 X<
NH-+H
><<N—;I
X<N-H
X<N-H
X<N- X<N-
16 is keyed into the displayed
X-register.
16 is copied into Y.
30 is written over the 16 in X.
30is entered into Y. 16 is
lifted up to Z.
11is keyed into the displayed
register.
11is copied into Y. 16 and 30
are lifted upto T and Z
respectively.
17 is written over the 11 in X.