DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1200 (Version 2)
|Date of introduction:||August 1975||Display technology:||LED-stick|
|New price:||$24.95||Display size:||8|
|Size:|| 5.5" x 2.8" x 1.4"
138 x 70 x 35 mm3
|Weight:||3.9 ounces, 110 grams||Serial No:||1081178|
|Batteries:||9V||Date of manufacture:||wk 48 year 1975|
|AC-Adapter:||AC9180||Origin of manufacture:||USA (LTA)|
|Program steps:||Courtesy of:||Joerg Woerner|
(US: 1.3M Bytes)
(EU: 3.5M Bytes)
design of the TI-1200 was only manufactured for a few months, Texas
Instruments changed the PCB slightly to accommodate four additional 330Ω resistors
to pull down the four keymatrix input lines of the
TMS0952 Chip to VDD.
Dismantling the featured TI-1200 with Date code 4875 LTA and manufactured in November 1975 in Lubbock, Texas reveals a very efficient and cost-optimized design with a single-sided printed circuit board (PCB) centered around a TMS0952 single-chip calculator circuit based on the TMS1000, the World's first Microcomputer.
Early calculators of the TI-1200 and TI-1400 family use a
keyboard with a 6*4 matrix having only 5 key-dome rows populated for a total of 20 keys. The unused key
hidden with the metal faceplate and removing it would add the missing [CS] or
Later the keyboard was cost-optimized to a 5*4 matrix. Find two of them in the Speak
& Spell introduced in the year 1976.
The TMS0952 was soon replaced with the TMS0972, a pin-compatible design dropping the additional resistors and capacitor and further reducing the manufacturing costs of the TI-1200 series.
Learn more about the
evolution of the TI-1200 between March 1975 and its discontinuation in 1977.
Learn more about the different Product Labels used with the TI-1200 - here at the Datamath Calculator Museum we classify the featured TI-1200 as Hardware Version 2, PCB Type 2 and Product Label Style 2, 7-Digit.
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© Joerg Woerner, May 29, 2021. No reprints without written permission.