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I understand the original developer used the integer math routines, instead of the math.h library, because the library plus his code was too large for the 186. With more memory, this optimization is not necessary. Using the math.h functions will make it easier to modify or extend the program, or discover errors in calculations.
However floating point math takes longer than integer math to execute, which is the main reason embedded developers avoid it ... but I wouldn't think that would be a big issue in this application. Another thing to experiment with ...
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