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Texas Instruments Collegiate

Date of introduction:  1988 Display technology:  LCD
New price:  $60.00 (SRP 1988) Display size:  10 + 2
Size:  5.7" x 6.1" x 0.40"
 146 x 155 x 10 mm3
   
Weight:  5.5 ounces, 155 grams Serial No:  A001
Batteries:  2*LR44 Date of manufacture:  mth 09 year 1988
AC-Adapter:   Origin of manufacture:  Taiwan (I)
Precision:  10 Integrated circuits:  
Memories:  5    
Program steps:   Courtesy of:  Joerg Woerner
    Download manuals:   (US: 12.1 MByte)
  (US-QR: 0.2 MByte)

The Collegiate doesn't look like a calculator developed by Texas Instruments.

Collegiate_1.jpg (473447 Byte)Collegiate_2.jpg (201863 Byte)The calculator uses a remarkable foldable keyboard with two different function layers.  You can either view the 15 built-in constants and 30 English-Metric conversions or the Two-variable statistics.



Dismantling this Coolegiate calculator manufactured in September 1988 by Inventec Corporation in Taiwan reveals a well-engineered design centered around an unknown Toshiba single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and connected with two flexible connectors to a second PCB for the additional keys.
Running Mike Sebastian's "Calculator forensics" shows a pretty common result of 8.99999863704 - proving Toshiba as supplier of the chip.

Inspecting the PCB of this Collegiate calculator brought our attention to a small mark reading IOSC10-21B, we noticed similar marks already with other calculators manufactured by Inventec Corporation and started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

In other countries an identical calculator was distributed as SC-10 while Radio Shack sold the very similar EC-4025.  

Don't miss the Personal Banker, one of the best calculators developed ever.

Interested in foldable calculators? Canon introduced already in 1980 with the Canon card F-72 a remarkable product.



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

Joerg Woerner, September 10, 2008. No reprints without written permission.