HP HP-65 - Page 10

preceded by the upshift [ key; the same gold symbol above a
key denotes the inverse (or complement) of the function of the
key when preceded by the [ key. To use a blue or gold function,
press the appropriate shift key (|81, [, or ) immediately be-
fore pressing the selected key. For example, you
Compute
sin (90°)=1
arc sin (.5)=30°
1/5=.2
By Pressing See Displayed
90 [l (510 1.00
5 W N 30.00]
5 @ A XN
The Operational Stack
There are four working registers in the HP-65 called X, Y, Z, and
T. They are arranged in a ‘stack’ with X on the bottom (see below).
To avoid confusion between
the name of a register and its
contents, the register is desig-
nated in this handbook by a
capital letter and the contents
Contents Location
t T
z z
y Y
X X
by a small letter. Thus x, y, z,
and t are the contents of the
X, Y, Z, and T registers.
When you key in a number, it goes into X, the displayed register.
When you press [ENTER®| , this number is also reproduced in Y.
At the same time Y is transferred to Z, z is transferred to T, and
tis lost (see below):
Press
Contents l Location
ENTER#
_/(Iost)
—
e