44 Section 3: The Memory Stack, LAST X, and Data Storage
The number in the register is determined as follows:
For storage arithmetic,
new contents
of register
=
old contents
of register
−
×
÷
number in
display
R
0
r
T
t
R
0
r − x
T
t
Z
z
Z
z
Y
y
Y
y
X
x
X
x
Keys:
O - 0
Recall Arithmetic. Recall arithmetic allows you to perform arithmetic
with the displayed value and a stored value without lifting the stack, that
is, without losing any values from the Y-, Z, and T-registers. The
keystroke sequence is the same as for storage arithmetic using l in
place of O.
For recall arithmetic,
new display
=
old display
−
×
÷
contents of
register
R
0
r
T
t
R
0
r
T
t
Z
z
Z
z
Y
y
Y
y
X
x
X
x − r
Keys:
l - 0
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