Texas Instruments LETTERlogic

Date of introduction:  1980 Display technology:  Fluorescent
New price:   Display size:  8 alphanumeric
Size:  6.2" x 3.4" x 1.1"
 157 x 86 x 29 mm3
Weight:  5.7 ounces, 163 grams Serial No:  
Batteries:  9V  Date of manufacture:  wk 03 year 1981
AC-Adapter:   Origin of manufacture:  Italy
Precision:   Integrated circuits:  TMC0273, TMC0355 (CD2604)
Program steps:   Courtesy of:  Joerg Woerner

Nothing else than the German edition of the Mr. Challenger.

Main differences are the keyplate with a German translation of the games built into the original Mr. Challenger and the Speech-ROM of the toy.

Letterlogic_PCB.jpg (85627 Byte)The printed circuit boards (PCBs) of the two versions are identical and share the TMC0273 microcontroller and a TMC0355 Voice Synthesis Memory (VSM), known as "128kBit Speech-ROM" of the Speak & Spell family. The different voices of the two games are coded in these ROMs, please notice the CD2604 (Custom Design) labeling instead the CD2601 discovered with the Mr. Challenger.

Don't miss the LETTERlogic sold in France and the LETTERlogic sold in the United Kingdom.

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If you have additions to the above article please email:

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