DATAMATH CALCULATOR MUSEUM |
Technico SB-847
Date of introduction: | 1985 | Display technology: | LCD |
New price: | Display size: | 8 | |
Size: | 6.4" x
4.0" x 0.45" 162 x 102 x 12 mm3 |
||
Weight: | 3.7 ounces, 105 grams | Serial No: | |
Batteries: | LR54 | Date of manufacture: | mth 09 year 1985 |
AC-Adapter: | Origin of manufacture: | Taiwan | |
Precision: | 8 | Integrated circuits: | |
Memories: | 1 | ||
Program steps: | Courtesy of: | Joerg Woerner |
Does this Technico SB-847 small desktop calculator look familiar to you? Yes, it is another variation of the SB-1027 sporting an 8-digit LC-Display and dropping the "MARK UP" functionality. Both were manufactured by Inventa Electronics Corporation of Taipei, Taiwan a leading calculator manufacturer in the Seventies and today better known as Inventec Corporation, one of the World's largest manufacturers of mobile devices and computers.
We discovered the SB-1027, and most important the SL-674CK, on our quest to learn more about the roots of the TI-1755 SLR introduced in 1983. While we found proof that TI-1754, TI-1755, TI-1756 and TI-1757 II are actually rebranded Inventa calculators, doesn't fit the TI-1755 SLR into the line. We decided for a thorough tear-down of the SL-674CK and the TI-1755 SLR to learn more about their relationship.
Dismantling
the featured Technico SB-847 manufactured in September 1985 by
Inventa Electronics Corporation in Taiwan reveals a clean design
centered around an unknown single-chip calculator circuit soldered on a
double-sided printed circuit board (PCB) and powered by
five solar cells and a small LR54 (LR1130) backup battery.
Inspecting the PCB of the
Technico SB-847 calculator brought our attention to a small mark
reading IO0847-02B. We found a similar PCB-Mark reading I074F-02B with the
LC-741CK and 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, April 6, 2024. No reprints without written permission.