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30
H
KEYO R
CON RO
KE S
z
~Y
X
z
z
y
/ "
Y
X
.../
X
'Rolls'
the display down without losing information:
·
sh~fts
the contents of Z to the Y register;
sh1fts the contents of Y to the X register;
shifts the contents of X to the Z register.
hint: ROLL
t
has the same effect as ROLL
~,
Step-saving
ROLLt·
EXAMPLE:
SWITCH:
PRESS:
PRESS:
DISPLAY:
J
J
FIXED POINT
CLEAR
t
ROLL
3. 142
0.
9
t
ROLL
~z
~y
9.
~
X
t
ROLL
TT
steps can be saved by
using
the ROLL
~
key
PRESS:
TT
ROLL
t
9
CLEAR
•
Exchanges the contents of the X and Y registers.
The contents of Z remain unchanged.
EXAMPLE:
20
3+2==
4
th1s example was used on Page
10
to illustrate the
use of the Z register for temporary storage. 0Jscount-
lng the CLEAR instruction (wh1ch JS not always neces-
sary) nine steps were required. By us1ng the
X
:_y
key only e1ght steps are required.
SWITCH:
FIXED POINT
SET: OECIMAL DIGITS to
2
PRESS:
3
t
PR-ESS:
2
0
DI
SPLAY:
4
.
00
~
Y
2
+
•
-
•
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