DATAMATH CALCULATOR MUSEUM
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DATAMATH CALCULATOR MUSEUM |
Texas Instruments Spelling B
| Date of introduction: | 1980 | Display technology: | Fluorescent |
| New price: | $30.00 | Display size: | 8 alphanumeric |
| Size: | 6.1" x 3.4" x 1.1" | ||
| Weight: | 5.5 ounces | Serial No: | |
| Batteries: | 9V | Date of manufacture: | wk 13 year 1980 |
| AC-Adapter: | Origin of manufacture: | USA (ATA) | |
| Precision: | Integrated circuits: | TMC0274, TMC0355 (CD2602) | |
| Memories: | |||
| Program steps: | Courtesy of: | Joerg Woerner | |
| Download manual: | 
(EUR: 6.375 kB)
(EUR: 3.650 kB) |
About
two years after the introduction of
the original Spelling B appeared this slightly
enhanced version. At first glance you"ll notice the note symbol printed on
the display bezel as a short hint to the added buzzer.
Dismantling
the 2nd generation of the Spelling B reveals a big surprise! The
original design based on two
TMS1000 series microcontrollers was replaced with a TMC0274 microcontroller
and
TMC0355, known as " 128kBit Speech-ROM" of the Speak & Spell
family.
Please notice the two red wires on the left of the pictured printed circuit
board (PCB), the small piezo buzzer is connected to them.
An identical product was sold in United Kingdom with the Spelling
ABC, while the Spelling ABC introduced in
Germany makes use of another language ROM.
All models were later replaced with a product using a LC-display. View it here.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, June 6, 2008. No reprints without written permission.