Technico SB-806M

Date of introduction:  1987 Display technology:  LCD
New price:   Display size:  8
Size:  4.9" x 2.8" x 0.28"
 125 x 70 x 7 mm3
Weight:  2.1 ounces, 59 grams Serial No:  
Batteries:  LR54  Date of manufacture:  mth 09 year 1987
AC-Adapter:   Origin of manufacture:  Taiwan
Precision:  8  Integrated circuits:  
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

Does this Technico SB-806M calculator look familiar to you? Please compare it with the more common Radio Shack EC-423. 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.

Dismantling the featured Technico SB-806M manufactured in September 1987 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-806M calculator brought our attention to a small mark reading IOSB806-01E. We found a similar PCB-Mark reading SB806II-01C with the EC-423 and started compiling a list of the PCB-Marks on calculators manufactured by OEMs for Texas Instruments.

Texas Instruments sold in 1986-1988 with the TI-1768 and TI-605 similar looking calculators with a tiltable LC-Display but they were manufactured by Compal Electronics in Taiwan.

If you have additions to the above article please email:

Joerg Woerner, April 6, 2024. No reprints without written permission.