OTRONA ATTACHE Series Manual page 43

calculator
The
RETURN
key will indicate a new set of values that are being used
independently of the previous calculations and move existing values up
the stack.
The function keys (add, subtract, multiply, and divide) will perform
opera tions on the val ues in the X and Y Regi ster s, r esul ting in val ues
moving back down the stack as
X
and
Y
become a single new value that is
the result of the current operation •
.%be L-
.e...
~ B....
.s...
.and
.7 Registers
Directly above the X and Y Registers on the calculator display are a
series of registers labelled
Z, P, Q, R,
S, and T.
T. REX;. 0.00
s.
REG. 0.00
R. REG.
0.00
Q.
REG. 0.00
P. Rffi.
0.00
Z. REG. 0.00
Y. REG. 0.00
X. REG. 0.00
These registers are also in the "stack." When a calculation requires
storing intermediate results in addition to those stored in the X and Y
registers, values are stacked in ascending order in these registers and
then retrieved on a last-in first-out basis as calculations are made.
Continuing with the example on the previous pages, the X Register now
displays 500 (which is the result of 100 + 50 x 10 / 3).
Y. REG.
x.
Rffi.
0.00
500
(cleared)
(the result of the calculation 1500 / 3)
A more complex calculation will require storing values for retrieval and
inclusion in the calculation at a later time. Suppose that the total
problem is as follows:
(100
+
50)
x
10 / 3
(5
x
30)
------------------- x
25
2
So far, the top half of the left side of the problem (100
+
50 x 10 / 3)
has been calculated and the result (SOD) is stored in the X Register. The
next step is to divide this value by 25.
6-7
I