Casio fx-7000G
Brief History
Researching of the liquid crystal display defined the direction of development in the calculator industry. Together with appearing of the full dot-matrix LCDs, new equipments were born in the 1980s: pocket computers, electronic dictionaries, diaries, quartz games etc. A brand new pocket computer was introduced to the Sharp-dominated market in 1983: the Casio PB-700 was the first to use graphic-oriented BASIC language. The next milestone was the fx-7000G in 1985: the world's first graphic calculator allowed to display user-entered functions on the rectangular coordinate system, or analyze these. Otherwise, this calculator was an extended version of the easy-to-use fx-4000P programmable calculator. Later, a full spectrum of graphic models were developed at Casio, ensured its domination in this segment of the calculator market for the next years.
| Manufacturer: | CASIO Computer Co., Ltd. (Japan) |
| Mfg. date: | 1985-89 |
| Size: | 8,3×16,5×1,3 cm |
| Weight (ready for operate): | n.a. |
| Type: | programmable scientific |
| Capacity: | 10/10+2 digits (input/display) 13+2 digits (internal precision) |
| Operating logic: | formula-interpreting |
| CPU: | NEC D1007G 008 |
| Registers: | 8 standard (with saving the pending operation) 20 bracket (with saving the pending operation) maximum of 78 memory (with aritmetic) |
| Features: | +/-change sign (direct entry of negative numbers) Ffloating-point notation Fixfixed-point notation: the listed decimals can be chosen (0-9) Sciscientific (exponential) notation Engengineering notation BSbackspace (right-shift) function Sqrsquare root x2square 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) DMS-DDconversion of decimal and sexagesimal numbers logexponential and logarithmical functions (10- and e-base) yxraising to power SDone variable statistics: calculating mean and standard deviation LRtwo-variable statistics: linear regression P-Rconverting coordinates between rectangular and polar systems n!factorial |
| Display: | 96×64 digit dot-matrix LCD |
| Power: | 3×CR2032 cells |
| Programming method: | merged keystroke-programmable |
| Program capacity: | maximum of 422 steps |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.00000029128 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00680420639E-70 |
Mode display of the fx-7000G
Inside of the fx-7000G with the main CPU and the memory chip
Inside of the fx-7000G: the keyboard and display control circuits
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