Texas Instruments Mathe-Fix

Date of introduction:  1986 Display technology:  
New price:   Display size:  n.a.
Size:  4.3" x 6.9" x  1.25" 
 108 x 176 x 32 mm3
Weight:  7.7 ounces, 219 grams Serial No:  
Batteries:  4*AA cells Date of manufacture:  wk 24 year 1989
AC-Adapter:   Origin of manufacture:  Italy
Precision:   Integrated circuits:  TMP50C40A (CD54170)
Program steps:   Courtesy of:  Joerg Woerner

Think about a Speak & Math without the fluorescent display trimmed to German language. 

A slightly more powerful version was sold in other countries with the:

France: le Calcul magique
Italy: Dotto Conta-Parla
United Kingdom: Maths marvel

Dismantling the Mathe-Fix manufactured in June 1989 by Texas Instruments in their Rieti, Italy facility reveals a small surprise: The printed circuit board (PCB) of the educational toy is centered around a TMS50C40A standard Voice Synthesis Processor (VSP) chip. We know this technology already from the Little Maestro and its siblings Speak & Music, La Musique Magique and Fonillo Suonaparla introduced in 1986, too.

The single-sided PCB is of the Mathe-Fix is labeled "MINI-MATH", obviously a reference to the original Speak & Math introduced by Texas Instruments already in 1980 and not related to the Minimath calculator developed in 1971.

The compact design of the PCB is centered around just one Integrated Circuits

TMP50C40A/CD54170: TSP50C50 VSP (Voice Synthesis Processor) with 8-bit microcontroller and 8k Bytes Mask ROM for both program and voice and 32 Bytes RAM

The Mathe-Fix is featured in the Texas Instruments Deutschland GmbH leaflet Spielen macht schlau dated 1991.

If you have additions to the above article please email:

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