Casio, FX-850P - Calculator - 1990-2000

Casio FX-850P programmable scientific calculator from the '80s. Integrated Scientific Library 116: The model is equipped with the scientific library containing 116 programs and mathematical/topographic/physical formulas already stored in memory and ready to use (instantly accessible by the LIB key combined with the codes on the lid).
In excellent and 100% working condition: it powers on instantly, responds perfectly to commands, and the memory has been reset. The LCD display is sharp and the contrast is perfectly adjustable via the dedicated side wheel. The internal contacts of the battery compartment are perfectly clean and free of oxidation.
The front aluminum panel and the keys are clean, without fading, discoloration, or deep scratches.
The calculator is 100% complete with its original structural parts.
Included:
The original rear metal sealing plate, intact and with factory markings clearly legible.
The main battery compartment’s metal latch.
The round screw-on cover for the backup battery.
The side plastic cap protecting the 30-pin expansion port.
Casio RP-8 Expansion Module (Included): On the back is installed the original 8K Byte RAM expansion module that extends the machine’s capabilities for programming in BASIC.
Original case: The original protective sliding cover is included, complete with its inner label reading "Scientific Library 116", perfectly legible with all the codes of the mathematical functions.
New batteries: Ready to use with freshly replaced batteries (2x Sanyo CR2032 for the main power + 1x CR1220 for backup).
NOTE: The item is sold "loose", without original box and paper manuals.