HP HP-11C User Manual

30 Section 2: Memory Stack, LAST X, and Data Storage
write them on paper. For example, to subtract 15 from 98 you first
write 98 on paper, then write 15 underneath it, like this:
98
=I5
Then you would perform the subtraction, like this:
9%
IS
&3
The numbers are positioned in the calculator in the same way, with
the first number, the minuend, in the Y-register and the second
number, the subtrahend, in the displayed X-register. When the
subtraction function is executed, the 15 in the X-register is
subtracted from the 98 in the Y-register, and the stack drops,
leaving the result in the X-register. Here is how the entire operation
is executed (assume that the stack registers have already been
loaded with the numbers shown as the result of previous
calculations):
lost lost
T A ) 2 || 2
Z9 -~ AT =
Y -~ ~" o8 |—>| o8
/
X > 98 4 98 |15
Keys 98 15 =)
For any arithmetic function, the numbers are always positioned ir
their natural order first, then the function is executed and the stack
drops. In the above example, we subtracted 15 from 98. The sam«
number positioning would be used to add 15 to 98, multiply 98 by
15, and to divide 98 by 15, that is:

HP HP-11C Specifications

General

Brand	HP
Model	HP-11C
Category	Calculator
Language	English