Casio ST-1
Brief History
Casio introduced the first combination of a calculator and a clock in 1976. The CQ-1 was a great success, so further development resulted an electronic stopwatch and a calculator combination: the ST-1 was in production from 1977. It was designed to be a stopwatch, so the start/stop button can be easily operated with thumb, the calculator keys can be protected against accidental operation by a window, and a visor can be attached to read the display even in strong sunlight. In addition to four operation modes of the stopwatch, it can perform operations with time data.
| Manufacturer: | CASIO Computer Co., Ltd. (Japan) |
| Mfg. date: | 1977 |
| Size: | 7,4×13,4×2,2 cm |
| Weight (ready for operate): | n.a. |
| Type: | four-function |
| Capacity: | 8 (7) digits (input/display) 8 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | NEC uPD579C |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | %calculation with percent Ffloating-point notation Sqrsquare root |
| Display: | 8 digit VFD (NEC LD8165A) |
| Power: | 1×AA battery |
ST-1
Inside of the ST-1
Keyboard and display of the ST-1
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