DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-508
|Date of introduction:||1989||Display technology:||LCD|
|New price:||Display size:||8|
|Size:|| 4.7" x 4.1" x
120 x 106 x 25 mm3
|Weight:||3.0 ounces, 86 grams||Serial No:|
|Batteries:||n.a.||Date of manufacture:||mth 06 year 1990 (B)|
|AC-Adapter:||Origin of manufacture:||Taiwan (C)|
|Precision:||8||Integrated circuits:||Sharp LI3135|
|Program steps:||Courtesy of:||Joerg Woerner|
Nevertheless the identification number TI-508 points to a handheld calculator, it could be called a "small desktop" machine. The calculator is based on the earlier TI-502.
this TI-508 manufactured in June 1990 by Compal
Electronics , an OEM (Original Equipment Manufacturer) in Taiwan, reveals a
clean design centered around Sharp LI3135 single-chip calculator circuit
soldered on a double-sided printed circuit board (PCB) and powered by solar
Inspecting the PCB of this TI-508 calculator brought our attention to a small mark reading SD9T-10, most likely a reference to Type Small Desktop 9, Texas Instruments and Revision 1.0 of the design (schematics and layout). We spotted this PCB-Mark already with the first TI-1795 and its near identical offspring Radio Shack EC-2006A and started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.
An identical calculator was sold as TI-1795 in the Americas, an identification number clearly borrowed from the desktop line.
Production of the TI-508 and its twin TI-1795 was shifted in 1991 from Taiwan to Thailand, just before the slightly redesigned TI-508 PLUS was introduced.
Don't miss the odd TI-808 and the TI-510.
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© Joerg Woerner, December 5, 2001. No reprints without written permission.