DATAMATH CALCULATOR MUSEUM
|Date of introduction:||1976||Display technology:||LCD (yellow)|
|New price:||Display size:||8|
|Size:|| 5.2" x 2.7" x
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|
|Program steps:||Courtesy of:||Joerg Woerner|
Toshiba entered with the LC-810 already in 1976 the market of LCD-calculators and outdated Texas Instruments' TI-1750 about one year.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.
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.
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.
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© Joerg Woerner, May 3, 2008. No reprints without written permission.