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Texas Instruments TI-10 Profit Guide

The TI-10
Profit Guide looks familiar to us and seems to be a mix of the basic TI-1746
with the calculating functions of a BA-20 missing
the clock module.

Dismantling
the TI-10 Profit Guide reveals the typical construction of OEM calculators
developed in the 80's. Unfortunately the calculator chip is soldered reverse on
the printed circuit board (PCB) but we could identify Inventec
Corporation from the date code as
manufacturer of the calculator.

Three special percentage calculations are implemented with six extra keys:

Calculation of cost limit for given selling-price and a
targeted margin: ( CST column of extra keys)<selling-price> SEL <target margin> MAR => cost
limit | |

Calculation of required selling-price for given cost and a
targeted margin: ( SEL column of extra keys)<cost> CST <target margin> MAR => required
selling-price | |

Calculation of achieved marging for given selling-price and cost: ( MAR column of extra keys)<cost> CST <selling-price> SEL => achieved margin |

The designation TI-10 was used in 2002 again for a scientific calculator.

If you have additions to the above article please email: joerg@datamath.org.

© Joerg Woerner, June 9, 2004. No reprints without written permission.