Calculated Industries 44080
From Wiki
Calculated Industries Model 44080 Construction Master Pro Desktop
- Type: Semi-Algebraic Electronic Calculator with Construction Application Features
- Size: 6.5 x 9 inches / 16 x 23 cm
- Date of Manufacture: May 2004
In point-of-sale box, with manual and CDROM tutorial in English and Spanish. (The CDROM says it needs Windows, but the tutorial sections are all Flash animations and are accessible to Macintosh OS X users.)
This is CI's biggest offering for professional contractors. It does dimensional arithmetic and unit conversions, area and volume calculations, masonry and lumber estimations, figuring out how to run stairs and frame roofs and joists. See the webpage for more information.
[edit] Basic Forensic Data
The Model 44080 is an 8-digit LCD display calculator. Calculations are done to 12 digits, fractions and exponents are supported. Fractions are always binary; entering 2/5 returns 13/32. The maximum denominator is user-selectable, that is if you want all results rounded to the nearest 1/8 inch, you can select that. (If you do, 2/5 becomes 3/8). Exponents range from -51 to 76, suggesting a 7-bit biased binary exponent. Angular values are only available in degrees.
The LCD display includes seven large seven-segment digits, one large two-segment digit (for a leading 1), four smaller seven-segment digits on the right hand end, used for exponents and fraction displays (the latter with two segments reserved for the fraction bar). Four HP-41C-style 16-segment letter positions are on the left, and there are several custom annunciators for displaying the current unit of measurement and other adminisitrivia.
This is one of CI's three calculators that include trig functions so we can apply Mike Sebastian's Calculator Forensics algorithm, asin(acos(atan(tan(cos(sin(9 degrees)))))), to get the result 9.0100557868.
The circuit board indicates that the processor is called MS85231, but no reference material seems available through Google. The chip itself is surface mounted directly to the circuit board and covered with a dollop of epoxy. The reverse of the circuit board has just the keypad contacts.
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