Vintage Sharp EL-5500III 3 Scientific Computer Complete w/Manual & Textbook EUC

Description

Vintage Sharp EL-5500III 3 Scientific Computer Complete w/Manual & Textbook EUC. Pre-owned, calculator is in excellent condition, fully tested and working great. Box is worn all around and has damage. The manual and textbook covers have wear and stains but all the pages inside are perfect. Please check all pictures as they are a part of the description and condition of this item.
From the web:
The Sharp EL-5500III is a programmable calculator with 12 digits precision and formula input logic. It has 77 keys, and an LCD (liquid crystal) display. It operates in two main modes:  CALC (calculator) and BASIC (programming mode).  The CALC mode has two additional sub-modes:  Matrices and Statistics (Linear Regression).   You can also convert numbers between Decimal (base 10) and Hexadecimal (base 16).
The matrix mode uses RAM and has two matrices in storage: X and Y.  Thankfully, Sharp printed matrix operations on their hard case, includes arithmetic, scalar arithmetic, inverse, squaring, transpose, and determinant.  Given how the EL-5500 III has was released over 30 years ago, I image someone has come up with a good program to find eigenvalues.   X not only serves an input matrix but an output. With the one line screen, elements are shown one at a time.
In CALC mode, calculations are in AOS mode (algebraic, with the one-variable argument functions such as the logarithmic and trig functions are executed after the number is entered), and the equals key ( [ = ] ) completes operations.  However, in BASIC mode, calculations are entered the way they are written, and they are completed when the [ ENTER ] key is pressed.
Feature—Value
Type—Programmable
Keys—77
Precision—12
Logic—Formula
Display type—LCD
Length—6.75”
Width—2.75”
Thickness—3/8”
Power Source 2x3V cell
Year introduced 1985
Year discontinued 1999
Will ship USPS Priority Mail
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