Texas Instruments TI-10 Profit Guide

Date of introduction:  1986 Display technology:  LCD
New price:   Display size:  10
Size:  4.8" x 2.5" x 0.35"
 121 x 65 x 9 mm3
Weight:  1.9 ounces, 54 grams 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 Profit Manager missing the clock module.

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

Dismantling the featured TI-10 Profit Guide manufactured in July 1986 by Inventec Corporation in Taiwan reveals a typical design of OEM (Original Equipment Manufacturer) calculators developed in the 80s. Unfortunately the calculator chip is soldered in reverse on the printed circuit board (PCB) but we suspect it is the Sharp LI3163 used with the BA-20 Profit Manager, too.

Inspecting the PCB of this TI-10 Profit Guide calculator brought our attention to a small mark reading IOTI10-02A, we spotted similar PCB-Marks already with the TI-1796 and TI-1798 manufactured in 1986, too. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

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.