Black model of the CFX-9850GB PLUS with protective slide cover, showing the menu-based interface on its screen. |
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| Type | Programmable Graphing |
|---|---|
| Manufacturer | Casio |
| Introduced | 1996 |
| Calculator | |
| Entry mode | Infix |
| Display Type | LCD Dot-matrix |
| Display Size | 128×64 dots |
| Programming | |
| Programming language(s) | BASIC-like |
| User Memory | 32 kibibyte |
| Other | |
| Power supply | four AAA alkaline batteries |
| Weight | 190 gram |
The Casio 9850 series (sometimes called 9x50 series) is a series of Casio graphic calculators.
Contents |
First made in the year 1996, there have been numerous variations of the CFX-9850G. The 9850 series models have 3-color screens apart from the 9750 versions which are black and white. The 9950G has 64k memory compared to the 32k of the original 9850G. The 9970G has symbolic algebra. Later versions such as Ga, GB and GC models fixed some bugs from the original G model and added some stats and finance features. The GB models have a built-in software library.
There are French versions where the ab/c and EXP buttons are labelled differently. (French versions: 9750=Graph 30,35,fx-8930GT; 9850,9950=Graph 60,65,CFX-9930GT,9940,9960; 9970=Graph 80)
The calculators weigh about 190 grams including batteries, and measure about 19.7 mm x 83 mm x 176 mm. Features include scientific calculations, including calculus, graphing and programming, statistics and matrix operations.
The back of the device shows a slightly protruding battery case cover, which slides out to reveal the compartment for the four AAA alkaline batteries used for primary power, and a CR2032 lithium button cell used for memory backup when primary power is down or being changed. The device consumes power at the rate of 0.06W, and turns itself off automatically after about 6 minutes of time spent without any keypad activity. Battery life for the primary power cells ranges from 240 hours to 150 hours, depending on the kind of battery being used. Backup cells last up to about 2 years each.
The screen's graphics resolution is 128 dots by 64 dots (the first row and column of dots are unusable in graphing), and its character resolution is 21 columns by 8 lines. The bottom line is reserved for function key menu tips, and the rest is available for the graphics and character display.
The screen is capable of three colors: orange, blue and green, apart from the 9750 models which have a black and white display. The colors are handled separately on three planes (orange is "above" blue which is "above" green), allowing to add or remove orange graphics without affecting the image below.
The calculators come with 32 or 64 kibibytes of inbuilt memory depending on the model. This is flexibly divided among storage blocks for programs, statistics, matrices, lists, static and dynamic graphs and their associated settings, functions, recursions, equations, financial data, and variables (all of which are global). These can be cleared individually or completely in the MEM menu.
The device can link up via specialized cables to a computer (FA-122 interface unit and cables) or to another calculator (SB-62 cable) to transfer data, such as programs, equations, graphs etc. It can also connect to a Casio label printer (SB-62 cable). Transmission speed is stated as 9600 byte/s.
The serial link cable was designed and U.S. patented (5504864) by Larry Berg of Purple Computing. It was manufactured by Traveling Software (AKA Laplink.com) and later by Purple Computing for Casio. The common name for the cable used by the companies was "PC-Link". It has a 2.5mm stereo phono plug on one end, the patented electronic circuit inside the plastic bump and a DB9F (standard 9 pin serial plug) on the other for connecting to the serial port of a PC. The circuit converts low voltage low power signals of the handheld device to be compatible with the levels and power of a PC's RS232 serial port. Versions of the circuit were used by many companies from the early 1990s to bridge the RS232/TTL voltage/power gap.
The CFX-9850GB PLUS and CFX-9950GB PLUS models have a built-in software library, consisting of programs that perform complicated calculations and data processing. For example, operations on differential equations, digital caliper measurements, capacitor charge curves, figure rotations and Riemann sums. These are organized into six sub-libraries, five of them for mathematical computations, and one for scientific instrumentation.
Graphs can be drawn with split-screen viewing of graphs as well as tables or zooms. Graphed areas can be shaded in customizable colors. The graph viewport can be resized and shifted (these settings can be saved for later retrieval), and points along the graph curves can be traced. Graph solver tools can also be used to find useful points, such as maxima/minima and intersection points. The calculator also has a special section for advanced conic section graphing. Dynamic graphing provides all the functionality of regular graphing, but allows the binding of a variable in the graph equation to time over a value range.
Up to 36 lists can be stored and manipulated in various ways in the list manager. The lists can be also be used to feed data into inbuilt statistics operations, producing various statistical figures, performing regression analysis, and generating graphs like scatter and box and whisker plots, among others. Tables can be generated from functions, recursive series can be generated, and equations can be solved - both simultaneous and polynomial.
A number of financial operations such as interest compounding and amortization are also provided.
According to the BogoMips mini-Howto, the calculator scores at 0.000027 BogoMips. [1]
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