HP HP12C hp 12c_user's guide_English_E_HDPMBF12E44.pdf - Page 172

172 Appendix A: The Automatic Memory Stack 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 E, V 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. File name: hp 12c_user's guide_English_HDPMBF12E44 Printered Date: 2005/7/29 Page: 172 of 209 Dimension: 14.8 cm x 21 cm