the calculator home page

Casio CFX-9800G (Color Power Graphic)

Casio CFX-9800G

The Casio CFX-9800G is a graphing calculator with 10 digits precision and formula input logic. It has 58 keys, and LCD colour display. The power source is 2xAAA + CR2032 3V. The calculator was manufactured in China. ​The calculator has a bulky feel to it. The case is quite thick and is not really one of the most elegent designs Casio have produced. The toy-like quality is further reinforced by the fake rivets on the silver-painted surround of the display. The display itself is one of the early colour LCD displays. In fact all it can really do is add red green and blue in addition to black. There is no back-light or gradation of the colour components. This limits the usefulness of the colour display to just the ability to present a graph containing multiple identifiable curves. Note: Main battery cover has a pin that must engage for calculator to work. A sample of this calculator is held in the collection.

Facts at a glance:

Display typeLCD colour
Display size126
Power Consumption0.100000W
Power Source2xAAA + CR2032 3V
Year introduced2000
Year discontinued2005


Note that diagnostic tests generally delete any data on the calculator. Be sure to back up any important information held in the calculator before running these tests.

Switch calculator off, then hold down F6 and fraction (a b/c) keys and press AC. Choose from the test menu, or 0 to reset and exit. Use the EXE key to step through each test. For the keypad test, press each key indicated on screen. If stuck in a test, try EXE, AC or EXIT keys to escape.


If you have a Casio CFX-9800G that is no longer working, you can first try replacing the 2xAAA + CR2032 3V batteries. If that doesn't solve the problem, then you can consider replacing the calculator with a modern equivalent. We suggest the following current model as a replacement:

See other calculators by Casio