Calculator apparatus with annuity switch for performing begin-and end-period annuity calculations
AssigneeHewlett-Packard Company
InventorsLynn W. Tillman, Kent R. Henscheid, Larry D. Smith
Life of this patent
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Abstract
A programmable electronic calculator is provided having a manually operable annuity switch with begin- and end-position settings, enabling a user to specify the type of annuity calculation to be performed. When the switch is set to the begin position, the annuity calculation is performed with payments due at the beginning of each payment period; when the switch is set to the end position, the annuity calculation is performed with payments due at the end of each payment period. The annuity calculation is performed under control of a routine stored in a read-only-memory (ROM) of a data processing unit.
Claims4
An apparatus for performing annuity calculations with payments due at one of the beginning and end of each payment period, said apparatus comprising:
- switch means manually settable to one of a first and second positions;
- and
- processing means coupled to said switch means and coupled to receive input data for performing selected annuity calculations with payment due at one of the beginning and end of each payment period, calculations with payment due at the beginning of each payment period being performed by automatically converting the input data to produce substitute data and mathematically manipulating the substitute data in response to the switch means being set to the first position, and calculations with payment due at the end of each payment period being performed by mathematically manipulating the input data in response to the switch means being set to the second position.
Dependencies are inferred from the claim text.