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Introduction 8
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preceded by the upshift f key; the same gold symbol above a key denotes the inverse (or complement) of the
function of the key when preceded by the f-1 key. To use a blue or gold function, press the appropriate shift
key (g, f, or f-1) immediately before pressing the selected key. For example, you
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Compute
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By Pressing
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See Displayed
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sin (90°) = 1
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90 fSIN
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arc sin (.5) = 30°
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.5 f-1SIN
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1/5 = .2
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5 g1/x
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The Operational Stack
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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).
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Contents
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Location
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t
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T
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z
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Z
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y
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Y
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x
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X
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To avoid confusion between the name of a register and its contents, the register is designated in this handbook
by a capital letter and the contents by a small letter. Thus x, y, z, and t are
the contents of the X, Y, Z, and T registers.
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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 t is lost (see below):
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Press
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Contents
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Location
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ENTER
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