January 9th, 2010· Bug fix for area under curve calculation.
November 16th, 2009· Molecular weight calculations now available.
· Further refinements to equation solver that can solve for 'x', in a function of 'x', given a value of 'y.'
· Cash Flow calculations now repeatable by entering zero for discount rate or cash flow.
· More thorough corrections in division by zero problem.
· Ideal Gas Law equation calculation repaired.
· Protection from taking a non-integer root of a negative number.
· Curve fit calculation for user defined function repaired.
· 'Exit and Save Memory' menu item now saves the active papertape to the archive.
· Complex roots of cubic equation corrected.
November 16th, 2009· Functionality solving for 'x', in a function of 'x', given a value of 'y' has been greatly improved.
· Days between dates functionality now converts number of days to years, months and days.
· Inactive "area under user defined curve" function has been repaired.
· Magnitude limit on binary to hexadecimal conversion lifted.
· User selected options for trigonmetric functions, conversions and constants will no longer be changed by other functionality. Statistics (stat.) selection will be changed by 'Clear' function only.
· Conversion between Kelvins and degree Centigrade(Celsius) is now available.
· Exponential and Power equations now available for curve fits.
November 16th, 2009· 30 day trial available to ALL users, new and past.
· "Division by zero" protection is unreliable in versions 2.2 and 2.3. Corrected in version 2.31.
October 5th, 2009· Old memory file is now archived when new memory file is created.
· Time stamp option now available for "Post Label" function. Also records elapsed time between consecutive time stamps.
· Problem with hexadecimal arithmetic is now repaired.
September 30th, 2009· Solves for X in a function of X, given value of Y.
· Calculations involving time (hours:minutes:seconds) now available from "dec" button.
· Currency calculations have been substantially improved. Curency values are now labelled with dollar (or other) signs, commas and two decimal places on the Papertape and in memory locations. Negative currency values are represented by parentheses. "Currency" mode is accessed when two decimal places is chosen for output to the Papertape.
· Values in the ten memory locations can now be accessed when designing user defined functions. ("mX" entry. X is a digit "0" through "9".)
· Example data sets for use with calculator functionality now included in software package
April 9th, 2008· Calculation of net present value of cash flow.
· Calculation of bond prices.
· Calculation of four versions of depreciation.
· Added calandar functions include; the determination of the number of days between dates; the date determined from the number of future days; the day of the week from the date and the number of days gone in the year.
· Matrix algebra.
· Normalization factor, with user defined exponent, added to determination of curve fits.
· Trigonometric functions, Conversions and Constants now more accessible from a menu on the "equations" menu.
· Prime factorization of integers available.
· All default files saved to directory of executable files. (See readme.)
· Limits on number of data points enterable for all functions have been lifted.
· Memory demands on computer have been reduced.
· Scientific notation excluded from all business calculations.
· Reload of memory for continuing equations repaired.
December 3rd, 2007· User defined functions can be entered and solved. Instead of inputing an experession with keystrokes or button clicking, following input of a colon (:), a mathematical expression can be typed in that will be solved all at once. If the expression contains the variables 'x' or 'y' at any location in the equation, and any number of times, the calculator will prompt the user for values of these variables and solve the equation. This action is repeatable.
· External data sets can be input to be solved by the available calculator functionality.
· Curve fits of user defined or stored functions can be made to external data sets input to the calculator.
· Areas under sections of a bell curve, parabola or user defined function can be determined by numerical integration.
· Binary, octal and hexadecimal arithmetic functions are color coded for easier use.
· Archive is time stamped when calculator is opened to create a clearer record of calculator usage.
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