Sears 58770
Brief History
Sears had broaden its product range with pocket calculators in 1972. Rockwell started its calculator assembly business after encouraging the success of Bowmar calculators, and provided a wide variety of basic, scientific and some special purpose models for OEMs. Sears offered some more complex models with the outline of the Sears Tower on the top of the stylish black housing. The scientific version was represented by the 58770 "Electronic Slide Rule" in 1974, which has an unusual feature: the used Rockwell A4002 IC provides the m+x2 function, which can accumulate the square of the displayed numbers.
| Manufacturer: | Sears, Roebuck and Co. (USA) |
| OEM: | Rockwell International (USA) |
| OEM model: | n.a. |
| Mfg. date: | 1974 |
| Size: | 8,9×15,4×3,3 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8 digits (input/display) 8 digits (internal precision) |
| Operating logic: | semi-arithmetic (Rockwell) |
| CPU: | Rockwell A4002 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | +/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Ffloating-point notation Sqrsquare root pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) logexponential and logarithmical functions (10- and e-base) yxraising to power |
| Display: | 8 digit VFD (ISE DP89A) |
| Power: | 4×AA-type battery 6V adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 62.57928 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 - |
Sears 58770
Display made by ISE and circuit of the 58770
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