HP HP-65 - General Instructions; Clear Operations

Section 1
General Operations
In this section we will describe how to = perform the clear op-
erations ® control the display ® enter numbers in scientific no-
tation ® recover from wrong keystrokes using the Last X feature.
In addition, a reference block is devoted to the operation of the
Stack Lift (automatic enter).
Clear Operations
Four separate clearing operations are possible with the HP-65,
using the [l functions of the fourth row of keys.
Clearing Unwanted Prefix
E cancels the effect of a prefix so that a non-prefix
operation can be done. Let’s say you accidentally press | N B
or [@], before keying in a number. If you then press the number
key, you will get an alternate function of that key instead of the
desired number-entry operation. To prevent this from happening,
press [ to cancel the effect of the unwanted prefix
key, then key in a number. If a wrong prefix key is pressed when
another prefix is wanted, the error can be corrected by simply
pressing the correct prefix and proceeding from there.
The following keys (not yet explained) are also prefix keys:
sto ReL [ER
Clearing Stack Registers
B clears all four registers (X, Y, Z, and T) of the operational
stack. To clear only the X-register, press CLX .
Clearing Addressable Registers
] clears all nine addressable registers. (These will be de-
scribed in a later section.)
18