HP HP-65 - Additional Stack Operations

The following operations destroy R,.
[siN] (trigonometric functions and their inverses)
(relational tests)
Calculating in Addressable Registers
Thus far, all calculations have involved the X-register or the X
and Y-registers to produce a result in X. In the-case of addressable
register arithmetic, the result is left in the addressable register and
X is unchanged.
Subtraction. To subtract x from r,, press sT0 = [n]
Addition. To add x to 1,,, press sto [+ [n]
Multiplication. To multiply x and r,,,press §10 % [n]
Division. To divide x into r,,, press st0 + [n]
For example, store 6 in register R, and then increment it by 2.
Press See Displayed Comment
6 'st0 [1] B3 Stores 6 in R;.
2 870 # 1) 2.00 Adds 2 toT,.
RCL (1] B Confirms that r,
equals 8.
Now, subtract 5 from the contents of R;.
5 sT0 = (1]
RCL (1]
Confirms that r, has
been reduced to 3.
Finally, multiply the remaining contents of R, by 2:
2 st0 % [1] -
ReL 3] 2
Confirms that r, has
been increased to 6.
Additional Stack Operations
You already know that, except for the case of the storage register
arithmetic just described, all calculations are done in the stack.
You simply put the problem numbers into place and press the
appropriate function key. You already know of the possibility of