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108
Function Keys
When you key a number into the display and press the
key,
each of the following operations is performed:
1. The number that you keyed into the X-register is added to the
contents of secondary storage register Rgy; (2x — Rgy).
2. The square of the number that you keyed into the X-register
is added to the contents of secondary storage register Rgs;
(2x* = Rg;).
3. The numberin the Y-register of the stack is added to the contents
of secondary storage register Rgg; (Zy — Rgg).
4. The square of the number in the Y-register ofthe stack is added
to the contents of secondary storage register Rgz; (Zy? — Rgy).
5. The numberthat you keyed into the X-register is multiplied by
the contents of the Y-register, and the product added to the
contents of storage register Rgg; (2Xy — Rgy).
6. The number 1 is added to storage register Rgy, and the total
number in Rgg then writes over the number in the displayed
X-register of the stack. The stack does not lift;
[,
X
1 .
<TR,]
The number that you keyed into the X-register is preserved in the
LAST X register, while the number in the stack Y-register remains
in the Y-register.
Thus, when you press [, the stack contents are changed...
...from this...
...to this.
T
t
T
t
Zz
z
z
z
Y
vy
Y
¥y
X
X
X
n
LAST X
x_JLAsTX
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