Texas Instruments Speak & Spell (Japan)

Date of introduction:  1979 Display technology:  Fluorescent
New price:   Display size:  8 alphanumeric
Size:  10.0" x 7.0" x  1.3" 
 254 x 177 x 34 mm3
Weight:  18.5 ounces, 526 grams Serial No:  J011797
Batteries:  4*C cells Date of manufacture:  wk 08 year 1980
AC-Adapter:  ? Origin of manufacture:  Japan
Precision:   Integrated circuits:  TMC0271, TMC0281, CD2321, CD2322
Program steps:   Courtesy of:  Joerg Woerner

SpeaknSpell_78_JP_Label.jpg (45249 Byte)At first glance this rare Speak & Spell manufactured in Japan could be mixed-up with the Speak & Math due to the grey housing.

SpeaknSpell_78_JP_1.jpg (65451 Byte)Dismantling this rare educational toy manufactured in February 1980 by (or for) Texas Instruments in Japan reveals a printed circuit board (PCB) identical to the original US product but with some interesting modifications:

The jack of the head phone is placed above the display.
The position of the jack for the power supply is slightly shifted.
The two TMC0351 and TMC0352 Speech ROMs are replaced with two
   TMC0350/CD2321 and TMC0350/CD2322 chips storing much simpler English words.

The Integrated Circuits (ICs) of this Speak & Spell (Japan) use 0.4 wide 28-pin SPDIP (Shrink Plastic Dual In-line Package with a 0.07 / 1.778 mm lead pitch) and a 0.6 wide 40-pin SPDIP encapsulations to safe real estate on the very clean layout of the PCB.

The design of the featured Speak & Spell (Japan) is centered around four Integrated Circuits:

TMC0271: 4-bit microcontroller with 2k*9 Bits ROM and 9*64 Bits RAM
TMC0281: TMS5100 VSP (Voice Synthesis Processor)
TMC0350/CD2321, TMC0350/CD2322: TMS6100 VSM (Voice Synthesis Memory) with 128k Bits, each

An inside view of some other dismantled Speak & Spell products could be found here.

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If you have additions to the above article please email:

Joerg Woerner, September 1, 2005. No reprints without written permission.