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Texas Instruments TI-1788

Date of introduction:  1981 Display technology:  LCD
New price:   Display size:  8
Size:  3.6" x 2.3" x 0.3"
 91 x 57 x 8 mm3
   
Weight:  1.3 ounces, 38 grams Serial No:  9166539
Batteries:  2*LR43 Date of manufacture:  year 1981
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  8 Integrated circuits:  NEC uPD1032G
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

TI-1788_Wallet.jpg (190257 Byte)The TI-1788 combines the clock and alarm-time function known from the TI-1790 with a simple 4-function calculator in a very small housing but misses the stopwatch. The unusual layout of the keyboard was corrected with the TI-1788 II introduced only six month later.

The backside of the calculator reveals another unusual feature - a hidden [POWER] switch.

TI-1788_IC.jpg (199232 Byte)Dismantling the featured TI-1788 calculator manufactured in 1981 by a non-disclosed Original Equipment Manufacturer (OEM) reveals a very clean design centered around a NEC uPD1032G single-chip calculator circuit soldered on a double-sided printed circuit board (PCB) and powered by two small LR43 batteries.

Inspecting the PCB of this TI-1788 calculator brought our attention to a small mark reading CC-31 B, we noticed this mark already with both the KMC 2000 and Radio Shack EC-303 and suspect to locate it with the offspring Privileg LC 6000 and Systema LC1400, too. Similar marks could be found with the TI-1788 II and TI-1788 III, the latter manufactured probably by Cal-Comp Electronics. We started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.



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

Joerg Woerner, March 5, 2009. No reprints without written permission.