Omron 88SR
Brief History
One of Omron's calculator with least successful design: the 88SR debuted in 1975. To see what they were able to get out of the same machine a year later, compare with the very elegant 10SR model. The most interesting feature of the machines is their operation: the exponent — similarly to some machines built with Rockwell circuits — is always visible, and the switch, which sets exponential or floating point modes, only switches the normalization of the mantissa on or off: in exponential mode, the absolute value of the mantissa is always a number between 1 and 9 (normal form), but in floating-point mode, numbers less than 10 million in absolute value are displayed without normalization — as on any other standard calculator. Apart from that, it is a well-usable, albeit now ridiculously accurate, scientific calculator that can calculate hyperbolic functions and their inverses, although the latter can only be invoked by pressing the hyp and arc keys in that order. The machine was imported to the United States by Marubeni Iida (Miida) with model number MC1000.
| Manufacturer: | Omron Tateisi Electronics Co. (Japan) |
| Mfg. date: | 1975 |
| Size: | 10,1×16×2,6 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8+2 digits (input/display) 8+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Hitachi HD3689A |
| Registers: | 1 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) Sciscientific (exponential) notation Sqrsquare root pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) hyphyperbolic functions (sinh, cosh, tanh and inverses: ar sinh, ar cosh, ar tanh) logexponential and logarithmical functions (10- and e-base) yxraising to power |
| Display: | 12 digit VFD (Itron FG125A2) |
| Power: | 4×AA battery or adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 61.852094 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 0 |
88SR
Inside of the 88SR
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