The calculator could print data and listings on any Centronics printer printing graphics required the Casio FP-100 plotter-printer. Heres my most recent find from last weekend, came in the original box with the original manual. Most recent thrift store find: Casio FX-880P. An optional Casio FA-6 interface board provided a cassette tape recorder connector, a Centronics printer connector and an RS-232C port. Most recent thrift store find: Casio FX-880P. The built-in 8 kB memory could be expanded using the optional Casio RP-8 (8 kB) or RP-33 (32 kB) RAM expansion modules. The calculator had a BASIC interpreter, MEMO function, a formula library. Internal slot for memory expansion (32 KB)Ĭonnector with support for RS232 and Centronics (only level converter for RS232, Centronics needed)Ģx 3V CR2032 lithium batteries as main power supplyġx 3V CR1220 lithium battery as memory backup (RAM power supply) (some indicators and a 5 digit 7-segment display)Ĩ KB RAM (FX-860P: 24 KB, FX-880P: 32 KB)ĬPU: VLSI at 1,228MHz. Remove the cover as shown in the illustration and replace the battery, taking care that its plus (+) and minus () ends are facing correctly. The calculator is equipped with a solar cell that can provide power to the device, but if the battery becomes old. To ensure that you do not accidentally turn on power while replacing the battery, slide the hard case onto the front of the calculator (fx-991ES PLUS). When I was a kid I used to see this calculator in store catalogs and magazines and always wanted to have one. The battery will need to be replaced when a dim or distorted display is noticed, or when the calculator stops working. The FX-880P, released in 1990, was (I think) the last device in this line of Casio personal computers / calculators, and was basically a FX-850P with 32KB of RAM (instead of just 8KB). The Casio FX-850P is a scientific calculator introduced in 1987 and sold until 1992. This guide demonstrates the process of replacing the battery for a Casio FX-991ES Plus calculator.
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