Sanyo CX-8191
Brief History
Following the CX-8190, which was inspired by the pioneer Sinclair Executive, Sanyo has released several similar thin calculators. The base model was replaced by the CX-8191, which already had a Japanese chip instead of a Rockwell one: its NEC-made CPU could perform square root calculation and change sign, and its display was built from large seven-segment LED display elements manufactured by Toshiba. Due to the technology limitations of inserting and soldering the display elements into the PCB, the individual digits of the displays constructed in this way are not in line, and are often slightly skewed, so that their readout does not reflect the otherwise excellent production quality. Later, a VFD display version of this machine was made, with type designation CX-8192, which was operated by standard AAA penlight batteries instead of button cells.
| Manufacturer: | Sanyo Electric Co., Ltd. (Japan) |
| Mfg. date: | 1974-75 |
| Size: | 7,5×15×1,3 cm |
| Weight (ready for operate): | n.a. |
| Type: | four-function |
| Capacity: | 8 digits (input/display) 8 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | NEC uPD277C |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) Ffloating-point notation Sqrsquare root |
| Display: | 9 digit LED (9×Toshiba) |
| Power: | 4×LR9 button cell or rechargeable battery |
CX-8191
Inside of the CX-8191
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