DATAMATH CALCULATOR MUSEUM
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|
first glance this rare Speak & Spell
manufactured in Japan could be mixed-up with the Speak
& Math due to the grey housing.
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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© Joerg Woerner, September 1, 2005. No reprints without written permission.