DATAMATH CALCULATOR MUSEUM |
Texas Instruments TI-1756
Date of introduction: | 1981 | Display technology: | LCD |
New price: | Display size: | 8 | |
Size: | 3.9" x
2.4" x 0.25" 100 x 60 x 6 mm3 |
||
Weight: | 1.6 ounces, 44 grams | Serial No: | 8687189 |
Batteries: | 2*LR54 | Date of manufacture: | |
AC-Adapter: | Origin of manufacture: | Taiwan | |
Precision: | 8 | Integrated circuits: | Sharp LI3033MT |
Memories: | 1 | ||
Program steps: | Courtesy of: | Joerg Woerner | |
Download manual: | (EU: 2.8M Bytes) |
In 1981/1982 Texas Instruments introduced not only cheap looking calculators manufactured in Taiwan like the TI-1015 or TI-1006 but some very stylish and thin calculators.
The line covers the TI-1754 (credit card
sized), TI-1755 (golden edition), TI-1756 and
TI-1757
(Music Card). All four models
got an audible instead of a tactile feedback of the entries.
Dismantling
this TI-1756 manufactured in 1982 by a non-disclosed OEM (Original Equipment
Manufacturer) in Taiwan reveals a clean design centered around a Sharp LI3033MT
single-chip calculator circuit soldered on a double-sided printed circuit board
(PCB) and powered by two LR54 (LR1130) batteries.
Inspecting the PCB
of this TI-1756 calculator brought our attention to a small mark reading MK65-A,
we spotted this PCB-Mark already with near identical offspring like the IMA
LC
688, Novus Electronics NS220 and Unisonic
LC-7311BK and suspect to
locate it in the Technico MK-65, too. Plus the Asaflex MK 653, Benkson CAL-20, Levi MK
1652 (Fellow collector Marie Collas reported that her MK 1652 sports an
IO065A04A mark!), MBO MK65, M-Office MK650, Olympia MK 65, Privileg Senator,
Radio Shack EC-376, Satek MK 652 and Unisonic LC-7311M. Based on the PCB-Marks located with the
TI-2130 and its twin Technico
F-800 we are almost positive that
the TI-1756 and its siblings were manufactured by
Inventa Electronics Corporation
of Taipei, Taiwan. We started compiling a list
of the PCB-Marks on calculators
manufactured by OEMs for Texas Instruments.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, January 3, 2002. No reprints without written permission.