Method and apparatus for computation stack recovery in a calcula

Details Method and apparatus for computation stack recovery in a calcula Method and apparatus for computation stack recovery in a calcula

1986-12-24

1989-04-11

Shaw, Gareth D.

Boots, shoes, and leggings

364706, 36471005, G06F 1506, G06F 1100

Patent

active

048212288

ABSTRACT:
A method and apparatus for recovery of a computation stack in a calculator is presented in accordance with a preferred embodiment of the present invention. In a calculator employing a stack for the storage of data to be utilized in a calculation, provision is made to store the contents of the stack before a calculation is performed. If, after the calculation is performed a user desires to "undo" the calculation, he may strike an "undo" key. The original state of the stack is then restored.

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patent: 4698784 (1987-10-01), Abell

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