Texas Instruments TI-10 Profit Guide

Date of introduction:  1986 Display technology:  LCD
New price:   Display size:  10
Size:  4.8" x 2.6" x 0.3"    
Weight:  1.8 ounces Serial No:  
Batteries:  n.a. Date of manufacture:  mth 07 year 1986
AC-Adapter:   Origin of manufacture:  Taiwan (I)
Precision:  10 Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual: (US: 1.5 MByte)

TI-10_Label.jpg (112516 Byte)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:

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

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If you have additions to the above article please email:

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