DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-1750 (3rd design)
|Date of introduction:||1978||Display technology:||LCD (yellow)|
|New price:||Display size:||8|
|Size:|| 4.5" x 2.7" x 0.35"
115 x 68 x 9 mm3
|Weight:||2.3 ounces, 65 grams||Serial No:||167773|
|Batteries:||2*LR44||Date of manufacture:||mth 02 year 1978|
|AC-Adapter:||Origin of manufacture:||Japan|
|Precision:||8||Integrated circuits:||Toshiba T3709|
|Program steps:||Courtesy of:||Joerg Woerner|
|Download manual:||(US: 0.8M Bytes)|
This TI-1750 looks identical to the 2nd version but uses an even cheaper internal construction. The connection between the LC-display to the printed circuit board (PCB) was changed from the former discrete coil springs to a zebra-stripe (an arrangement of conductive and isolation rubber pieces).
Before the TI-1750 was later replaced with the similar TI-1750-II it got a massive cost reduction. Don't miss the 4th design of the TI-1750.Read more about the history of the TI-1750 here.
|It is obvious that the 1st design used three batteries instead only two of this 3rd design.|
|The internal construction is totally different. The 1st design uses a huge 42-pin DIL (Dual In Line) plastic housing instead this 43-pin QFP (Quad Flat Pack) housing.|
|The 3rd design of the TI-1750 uses a battery holder to accommodate 3 coin batteries. One of them is blocked with a dummy battery.|
|Later models cut the battery holder down to 2 places.|
are different rumors which companies designed and manufactured the TI-1750,
usually you get Toshiba and Sharp.
Comparing the 4 versions with similar calculators manufactured by Sharp we could
reject this speculation. On the other hand we canít believe that Toshiba used
a calculator chip from competitor Sharp.
all parts for a hint to possible manufacturers gives you the Sansyu
Press the X-RAY
button and view the internals of a TI-1750.
Watch carefully and you'll notice the odd battery compartment !
(Pictures provided by Edward Soudentas)
If you have additions to the above article please email: email@example.com.
© Joerg Woerner, May 16, 2002. No reprints without written permission.