HP HP-67 - Page 84

80 Storing and Recalling Numbers
To clear the secondary storage registers, use the key to bring their
contents into the primary registers, then clear those registers in either
of the methods described above.
For example, to clear storage register Rg only, then to clear all primary
registers, and finally all secondary registers:
Press Display
6RO
O Ry contents have been
cleared to zero.
0 All primary registers
cleared to zero. Second-
ary registers remain
intact.
o [0
etc.
o Contents of secondary
registers exchanged with
primary registers.
o All storage registers have
now been cleared to zero.
a
M|
etc.
Notice that the stack registers remain intact when you press | (CC2EC).
To clear the displayed X-register, of course, you can press [S%3 .
To clear the entire stack, press ENED .
(Because of the automatic lift and drop of the stack, you should never
have to clear it.) When the calculator is turned ON, it ‘‘wakes up’’
with the stack and all storage registers cleared to zero, so turning the
calculator OFF, then ON clears the stack, the storage registers, and all
program information. (This also should never be necessary.)