Texas Instruments RR-2 Thesaurus / Spell Checker

Date of introduction:  1990 Display technology:  LCD dot matrix
New price:   Display size:  15 char 
Size:  3.2" x 7.0" x 0.7"    
Weight:  5.5 ounces Serial No:  501877
Batteries:  4*AAA Date of manufacture:  mth 01 year 1991
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  10 Integrated circuits:  CPU: Toshiba TMP84C02
 ROM: Toshiba TC534000
 RAM: UMC UM6116
 Display: LCD-Driver
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Texas Instruments introduced already in the year 1989 this powerful combination of a Thesaurus and a Spell-Checker. In Germany it was advertised as PS-4500.

A much smaller sibling was available with the PS-4000

What is a Thesaurus? It is a word processing feature that finds synonyms and antonyms. Type in a word and get out a list of synonyms and antonyms. If you find a word (term, expression, phrase) you like better, you can replace the original word in your sentence. The storage capacity covers 40,000 keywords to create 590,000 synonyms. 

What is a Spell-Checker? Type in a word and the Spell-Checker compares it immediately with roughly 97,000 words of its memory. 

A Spell-Checker without the Thesaurus was introduced already in 1989 with the otherwise identical RR-1. The main difference in the hardware is the size of the Read-Only-Memory - the RR-2 uses a 512k Bytes chip instead the 128k Bytes of the RR-1. 

The RR-2 Thesaurus / Spell Checker is featured in the Texas Instruments Incorporated leaflet Pocket Solutions (CL-1059) dated 1990.


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If you have additions to the above article please email:

Joerg Woerner, February 17, 2002. No reprints without written permission.