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Saturday, August 17, 2013

RPN Scientific Calculator: Tweaks

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Recently I was able to get some new components and took the chance to make a few tweaks to the calculator. First of all, I hooked up a new ...
Monday, July 29, 2013

RPN Scientific Calculator: More CORDIC Routines

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After finishing the CORDIC routine for logarithms I started on the CORDIC routine for trig functions. For this I needed a different look up...
Wednesday, July 10, 2013

RPN Scientific Calculator: Division and Logarithms

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After rewriting the multiplication function I started on the division routine. There are several ways to do this. I used the subtract and ...
Wednesday, June 12, 2013

RPN Scientific Calculator: Software Update

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Work continues on my calculator. Each byte of a BCD number now holds only one digit instead of two. This eliminates the functions that were...
Friday, May 31, 2013

RPN Scientific Calculator: External RAM

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The last part of the hardware needed to complete the calculator is external RAM. Even if it does not have any programming capabilities, it ...
Thursday, May 30, 2013

RPN Scientific Calculator: Keypad

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The next step of the hardware for my calculator is a keypad. I finished this several weeks ago but I haven't posted anything about it b...
Saturday, May 18, 2013

RPN Scientific Calculator: Multiplication

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The next step of the software for my calculator is multiplication. In Binary Coded Decimal (BCD) this is fairly straightforward. Every deci...