HP 9100B Operating & Programming Manual page 39

THE KEYBOARD
CONTROL KEYS
The five control keys (
t,
+ ,
ROLL
t ,
ROLL
+ ,
x :,y) are
used to reposition the contents of the display registers.
Duplicates the contents of X in the Y register.
Shifts the contents of Y to the Z register.
The contents of the Z register are lost.
EXAMPLE:
SWJTCH: FIXED POINT
PRESS:
4
t
3
t
DISPLAY:
'7 .
-+Z
3 . -+ Y
3 .
~
X
Duplicates the contents of Z in the Y register.
Shifts the contents of Y to the X register.
The contents of the X register are lost.
EXAMPLE:
SWITCH :
FIXED POINT
PRESS:
6
t
5
t
DISPLAY: 5 .
-+
z
5 .
--+
y
5 .
~
X
'Rolls' the display up without losing information:
sh!fts the contents of X to the Y register;
sh!fts the contents of Y to the Z register;
.
s~ 1fts the contents of Z to the X
register.
Step savang hant: ROLL • has the same effect as ROLL
t
ROLLt. '
EXAMPLE:
See ROLL ~
key.
Lost
z ~ z
Y -~ Y
x
..L.-.x
z
)'
.r
Lost
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