DATAMATH CALCULATOR MUSEUM
Texas Instruments Speak & Maths (Type 1)
|Date of introduction:||1980||Display technology:||Fluorescent|
|New price:||Display size:||9 alphanumeric|
|Size:|| 10.0" x 7.0" x 1.3"
254 x 177 x 34 mm3
|Weight:||16.7 ounces, 474 grams||Serial No:|
|Batteries:||4*C cells||Date of manufacture:||wk 36 year 1981|
|AC-Adapter:||AC9199||Origin of manufacture:||Italy|
|Precision:||Integrated circuits:||TMC0270/CD2704, TMC0280/CD2801, CD2392, CD2393|
|Program steps:||Courtesy of:||Joerg Woerner|
Did you already noticed the small difference? This Speak & Maths sold in the United Kingdom is 100% identical to the Speak & Math sold in the United States of America.
Please notice the gold lettered "Texas Instruments" on the display screen and the large "TI" logo on the keyboard. The original products changed the logo in the year 1986. Compare yourself with a newer US Speak & Math.
Dismantling this Speak & Maths manufactured in September 1981 by Texas Instruments in their Rieti, Italy facility for the British market reveals a design identical to the US version and centered around four Integrated Circuits:
TMC0270/CD2704: 4-bit microcontroller with 2k*9 Bits ROM and 9*64 Bits RAM
• TMC0280/CD2801: TMS5100 VSP (Voice Synthesis Processor)
• TMC0350/CD2392, TMC0350/CD2393: TMS6100 VSM (Voice Synthesis Memory) with 128k Bits, each
The Speech-ROMs of the Speak & Math vary depending on the production date. Starting in 1981 the overall capacity was significantly reduced, differences in the word list and voice tunes are not known:
• 1980: TMC0350/CD2392 + TMC0350/CD2393 for a combined 256k Bits
• 1981: TMC0350/CD2381 + TMC0355/CD2614 for a combined 160k Bits
An inside view of some dismantled Speak & Spell products could be found here.
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© Joerg Woerner, December 21, 2001. No reprints without written permission.