Texas Instruments TI-5100

Date of introduction:  January 1976 Display technology:  Fluorescent
New price:  $69.95, DM 198.00
 $40 (October 1981)
Display size:  10
Size:  7.8" x 7.5" x 2.5"    
Weight:  1 pound 3 ounces or 
 2 pounds 1 ounces
Serial No:  9396085
Batteries:   Date of manufacture:  wk 50 year 1981
AC-Adapter:  AC9171, AC9900/G Origin of manufacture:  USA
Precision:  10 Integrated circuits:  TMC1073
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner
    Download manual:   (US: 3.2 MByte)

Introduced in parallel with the successful TI-5040 this non-printing desktop calculator had a rather long lifespan of roughly 5 years. A similar model with a 12 digits display was introduced one year later with the TI-5200.

TI-5100_USA_PCB.jpg (132591 Byte)The TI-5100 was manufactured both in USA and Netherlands. The European model we discovered uses different electronics. 
The TMS1073 of the famous TMS1000 Microcomputer family calculator chip inside the TI-5100 was later used with the Toshiba BC-1015.

The differences in the weight result from an "optional" metal plate inside the calculators to give a more stable feedback of the keyboard entries. 

About 8 years later we got the TI-5100 II with a much sleeker housing.

The TI-5100 is featured in the Texas Instruments Deutschland GmbH leaflet ER-1976 dated 1976.


Find here an excerpt from the Texas Instruments Incorporated leaflet CL-199J dated 1981:


An attractive, functional calculator that means business.

This versatile, quality calculator can increase calculating efficiency in the office or at home with silent, effortless operation. Adds, subtracts, multiplies, divides and features a memory to store and recall numbers. Display shows M when a number is in memory. Overflow is indicated by an arrow at the left of the display. Calculate percentages, taxes and discounts. An item count key for simplified inventory and calculation of averages. Decimal selector switch positions decimal at full floating or presets at two places. Large 10-digit green vacuum fluorescent display (with comma) for easy readability.

Texas Instruments, 1981

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If you have additions to the above article please email:

Joerg Woerner, December 5, 2001. No reprints without written permission.