Collection Item 

Casio FX10 Scientific Calculator
Brand:  Casio.  
Model:  FX10 Scientific Calculator. "FX" is the mathematical designation of Function and 10 is for the number of scientific keys of this calculator.  
Origin:  Japan.  
Introduction:  May 1974.  
Type:  Handheld 10function scientific calculator operated with 4 AA batteries and external adapter.  
Functions:  4 basic functions with constant plus 10 scientific functions: Decimal and Natural Logarithm, e^x, a^n, 1/x, Sin, Cos, Tan, Square Root and Sexagesimal to Decimal conversion. Also there is a Pi constant key. Please note there is no 10^x key, no inverse trigonometric functions and the a^n key works only with integer values on n between 0 and 9. 

Display:  8 digit VFD Digitron display in one crystal tube. Each digit contains 9 segments but this calc uses only 8 segments (7 for numerals plus decimal point). This calc uses the famous "halfheight" zero used for Casio in early VFD calculators. The reason for this is unknown, but one possibility is to reduce reading confusion in case of a segment(s) failure. For example, number 1.018046 is displayed as: 

Keyboard:  29 keys in two blocks: 19 colorful big keys for basic functions including Pi Constant and 10 smaller blue keys for scientific functions. On/Off switch.  
Main chips:  Two NEC chips identified as uPD175C (E48076) and uPD179C (E48016) with no identificable datecode.  
Remarks:  This is the first handheld scientific calculator made by Casio, a reduced version (in size and functions) of the previous FX1 desktop calculator. Casio made a clone of the FX10 for Sperry Remington: The SSR8, the exact same machine but in different colors.  
Size:  5.91 x 3.74 x 1.26 in, 150 x 95 x 32 mm.  
Accesories:  This example has all accesories provided with a newbrand calculator: Original cardboard box, internal protective styrofoam, protective plastic film, leathertype soft case, User Manual in English, original Warranty and external 110v adapter with own cardboard box.  
Condition:  (8.5/10) Very Good, Mint, minimal marks on the keyboard template, full working.  
Download:  Original Casio FX10 Operator's Instruction Manual in English, click here. 
Some advertisements of the Casio FX10 I found on the web, click on the thumbnail. 
Pictures of my Casio FX10. 