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Toshiba LC-810

Date of introduction:  1976 Display technology:  LCD (yellow)
New price:   Display size:  8
Size:  5.2" x 2.7" x 0.45"
 133 x 68 x 12 mm3
   
Weight:  2.8 ounces, 78 grams Serial No:  101212
Batteries:  2*LR44  Date of manufacture:  mth 10 year 1976
AC-Adapter:   Origin of manufacture:  Japan
Precision:  8 Integrated circuits:  Toshiba T3394A
Memories:  1    
Program steps:   Courtesy of:  Joerg Woerner

LC-810_BACK.jpg (168852 Byte)Toshiba entered with the LC-810 already in 1976 the market of LCD-calculators and outdated Texas Instruments' TI-1750 about one year. This LC-810 followed the BC-819, a design based on vacuum fluorescent display (VFD) technology.

Don't miss the ground breaking Sharp EL-805 sporting a silver-coloured COS-LCD display introduced already in 1973.

LC-810_PCB.jpg (305733 Byte)Dismantling the LC-810 reveals with the Toshiba T3394A a calculator circuit in a traditional dual-inline plastic housing with just 28 pins, not enough connections to scan the keyboard and drive the display direct. Toshiba preferred a serial interface with just 7 pins to a display module.

LC-810_LCD1.jpg (106818 Byte)The display module itself was manufactured by Epson, Japan and sports a driver circuit mounted on a ceramic substrate and connected to the glass frame of the liquid crystal display.  

The LC-821 manufactured only few month later used with the Toshiba T3489 calculator circuit a real single-chip design in a package with much more pins. 

 



If you have additions to the above article please email: joerg@datamath.org.

Joerg Woerner, May 3, 2008. No reprints without written permission.