Casio HL-809
Brief History
Casio introduced a simple and cheap LCD calculator, HL-809 in 1980. The power switch is a simple metal spring which can directly contact with the batteries when the plastic button was pushed upwards. To reach large quantities, all of the three major japanese manufacturers provide chips: the NEC D1871C, Toshiba T6718 and Hitachi HD43111B ICs are identical, and can be found not only in the first series, but in the second series (HL-809B) built with new display.
| Manufacturer: | CASIO Computer Co., Ltd. (Japan) |
| Mfg. date: | 1980-81 |
| Size: | 7,1×11,5×1,9 cm |
| Weight (ready for operate): | n.a. |
| Type: | four-function |
| Capacity: | 8 digits (input/display) 8 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Hitachi HD43111B |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with arithmetic and auto-summation) |
| Features: | %calculation with percent Ffloating-point notation |
| Display: | 8+1 digit LCD (EPSON LD-B414) |
| Power: | 2×AA battery |
Casio HL-809
Version with NEC IC
Version with Hitachi IC
Inside of the HL-809
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