Texas Instruments LETTERlogic

Date of introduction:  1980 Display technology:  Vacuum 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:  year 1980
AC-Adapter:   Origin of manufacture:  Italy
Precision:   Integrated circuits:  TMC0273, TMC0355 (CD2603)
Program steps:   Courtesy of:  Joerg Woerner

This LETTERlogic sold in the France is almost identical with its German and British siblings LETTERlogic and LETTERlogic but sports a different imprint on the keyplate.

The printed circuit boards (PCBs) of the three versions are almost 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 languaged of the three games are coded in these ROMs:

CD2601: Mr. Challenger, LETTERlogic (UK)
CD2603: LETTERlogic (France)
CD2604: LETTERlogic (Germany)

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If you have additions to the above article please email:

Joerg Woerner, August 1, 2012. No reprints without written permission.