DATAMATH CALCULATOR MUSEUM
Texas Instruments TI-508
|Date of introduction:||1991||Display technology:||LCD|
|New price:||Display size:||8|
|Size:||4.9" x 4.2" x 0.9"|
|Weight:||3.0 ounces||Serial No:|
|Batteries:||n.a.||Date of manufacture:||mth 07 year 1992|
|AC-Adapter:||Origin of manufacture:||Thailand (C)|
|Precision:||8||Integrated circuits:||Sharp LI3135MR|
|Program steps:||Courtesy of:||Joerg Woerner|
Production of the TI-508 and its twin TI-1795 was shifted in 1991 from Taiwan to Thailand. The leading "C" in the Date code reveals Cal-Comp Electronics as manufacturer of these small desktop calculators.
this TI-508 manufactured in July 1992 by Compal
Electronics , an OEM (Original Equipment Manufacturer) in Thailand, reveals a
clean design centered around a Sharp LI3135 single-chip calculator circuit
soldered on a double-sided printed circuit board (PCB) and powered by solar
cells. We known this chip already from the TI-502.
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.
Within a few month the TI-508 PLUS replaced the TI-508.
If you have additions to the above article please email: firstname.lastname@example.org.
© Joerg Woerner, December 5, 2001. No reprints without written permission.