OTRONA ATTACHE Series Manual page 42

calculator
Note: the result of a calculation appears highlighted because that value
is now stored in the X Regi ster. Addi tional opera tions could be
performed using this result since that value is now stored in the X
Register.
When another number is keyed, the result of the previous operation
becomes the first number in the next calculation and is bumped to the Y
Register, just as the first number was bumped when the second number was
entered in the previous example.
For example,
if
you key
10
Y. REXi. 150
(the previous result becomes the new first number)
x.
REX;. 10
(the new second number)
and then press
*
Y. REXi. 0.00
(cleared)
x.
REXi. 1500
(the result of the calculation 150 x 10)
The calculation has now expanded to 100 plus 50 times 10. You could
continue chaining operations like this using only one function and two
numbers at a time.
For example, you could divide the result of the previous calculation by
three. The problem is now 100 plus 50 times 10 divided by 3.
Key 3 and press /
Y. REXi. 0.00
(cleared)
x.
REXi. 500
(the result of the calculation 1500 / 3)
The answer
500
is displayed (and stored) in the X Register.
For more complex calculations, you will still be working with only one
fUnction and two numbers at a time. Intermediate results will be moved
farther up the stack and then retrieved automatically after additional
two-number calculations have been made.
Each intermediate result will be made independent of the other
calculations and stored. Calculations will then be made on the results
of these independent operations.
The role played by the
RETURN
and function keys in moving values up and
down the stack will become clear as the sample problem is worked out on
the following pages.
6-6