Tandy Radio Shack EC-400
| Manufacturer: | Tandy Corporation (USA) |
| OEM: | Bowmar-Ali Inc. (USA) |
| OEM model: | MX-90 |
| Mfg. date: | 1974 |
| Size: | 7,8×13,2×3,7 cm |
| Weight (ready for operate): | 202 g |
| Type: | extended four-function |
| Capacity: | 10 digits (input/display) 10 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Western Digital LC1692B |
| 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 +/-change sign (direct entry of negative numbers) Ffloating-point notation Sqrsquare root 1/xreciprocal |
| Display: | 10+1 digit LED (Bowmar Optostic R7H-172-11B) |
| Power: | 3×AA NiCd rechargeable battery (built-in) |
EC-400
Inside of the EC-400: the PCB
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