DATAMATH CALCULATOR MUSEUM |
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 |
Toshiba entered with the LC-810 already in 1976 the market of LCD-calculators and outdated Texas Instruments' TI-1750 about one year.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-colored 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.
If you have additions to the above article please email: joerg@datamath.org.
© Joerg Woerner, May 3, 2008. No reprints without written permission.