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<title>Free 15C RPN Scientific Calculator</title>
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<h1>Free 15C RPN Scientific Calculator</h1>

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This is a simulator for the <a href="http://www.hpmuseum.org/hp15.htm">HP-15C</a> advanced scientific programmable calculator.
This simulator aims to include all features of the HP-15C including:
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    <li>Complex arithmetic
    <li>Matrix math
    <li>Numerical integration
    <li>Numeric equation solver
    <li>Programmability
    <li>Statistics functions
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This simulator has been developed independently and does not rely on any actual HP-15C code or ROM images.
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<h2>History</h2>

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I bought my HP-15C in 1987 as my first RPN calculator, and used it throughout university.
I still have my original one, and it continues to operate on the <em>same</em> set of batteries, after 25 years.
The form factor (horizontal layout) is the distinctive feature of this family of calculators.
There is even a <a href="http://hp15c.org">Petition to Bring Back the 15C</a>.
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This implementation was inspired by the <a href="http://www.hpmuseum.org/simulate/hp35sim/hp35sim.htm">HP-35 Calculator Simulator</a> at the Museum of HP Calculators.
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<h2>Known Issues</h2>

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The following functions are known to be incomplete or nonfunctional:
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    <li>Some rounding errors in functions like -&gt;H.MS
    <li>Numeric range checking
    <li>PSE function in a program doesn't actually pause
    <li>Indirect matrix access through I register
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<h2>Author</h2>

<p>This HP15c simulator was developed by <a href="http://hewgill.com">Greg Hewgill</a>.

<address>
Greg Hewgill <a href="mailto:greg@hewgill.com">&lt;greg@hewgill.com&gt;</a>
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