HP 12C Financial calculator User Manual

Page 172

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172 Appendix A: The Automatic Memory Stack

File name: hp 12c_user's guide_English_HDPMBF12E44

Page: 172 of 209

Printered Date: 2005/7/29

Dimension: 14.8 cm x 21 cm

Termination of Digit Entry

The first digit keyed in after digit entry has been terminated replaces the number
already in the displayed X-register. Digit entry is automatically terminated when
any key is pressed (except for digit entry keys — digit keys,., Þ, and É —
and prefix keys — f, g,?, :, and i).

Stack Lift

When the stack lifts, the number in each stack register is copied into the register
above, and the number formerly in the T-register is lost. The number formerly in the
X-register is then contained in both the X-register and the Y-register.

When a number is entered into the displayed X-register — either from the
keyboard, from a storage register (using :), or from the LAST X register (using
F) — the stack usually lifts first. The stack does not lift if the last key pressed
before a number is entered was one of the following: \, O, _, ^, A or
C.

*

If one of these keys was the last key pressed, the number in the displayed

X-register is replaced when a new number is entered.

Rearranging Numbers in the Stack

The

key

Pressing ~ exchanges the numbers in the X- and
Y-registers.

Certain functions (Т, П, !, E, V, Э, #, Ц, v, R, and Q)
return answers to the Y-register as well as to the displayed X-register. The ~ key,
since it exchanges the number in the Y-register with that in the displayed X-register,
is used to display the second number calculated.

The

Key

When d (roll down) is pressed the number in each
stack register is copied into the register below, and the
number formerly in the X-register is copied into the
T-register.

*

In addition, the stack does not lift when a number is entered if the last operation performed

was storing a number into a financial register. For example, the stack will not lift when a
number is entered following the sequence 100000$, but will lift when a number is entered
following the sequence 100000$M. Note also that although the stack lifts when \ is
pressed, it does not lift when a number is entered after \ is pressed.

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