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<title>2005/sykes - Best Emulator</title>
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<div class="header">
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2005/sykes - Best Emulator</h2>
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<a class="Left" href="../persano/index.html">← persano</a>
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<a class="Left" href="../index.html">↑ 2005 ↑</a>
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<a class="Left" href="../timwi/index.html">timwi →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/2005/sykes/sykes.c">C code</a>
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<h2 id="author"><a name="author"></a>Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Stephen_Sykes">Stephen Sykes</a><br>
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Location: <a href="../../location.html#FI">FI</a> - <em>Republic of Finland </em> (<em>Finland</em>)
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<br><br></li>
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<h2 id="to-build">To build:</h2>
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<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span></span></code></pre></div>
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<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
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<p>The current status of this entry is:</p>
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<pre><code>STATUS: INABIAF - please **DO NOT** fix</code></pre>
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<p>For more detailed information see <a href="../../bugs.html#2005_sykes">2005 sykes bugs</a>.</p>
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<h2 id="to-use">To use:</h2>
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<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./sykes</span> binary_file</span></code></pre></div>
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<h2 id="try">Try:</h2>
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<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>For those who fondly remember their first
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<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a>, this entry will start you
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down memory lane … starting with <code>$C000</code> of course!</p>
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<p>We encourage you to try and grok the obfuscated expression on <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/sykes.c#L56">line
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56</a>,
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after the C pre-processor gets finished with it!</p>
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<p>We downloaded the <a href="https://en.wikipedia.org/wiki/ROM_image">ROM</a> contents to use
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the <a href="https://en.wikipedia.org/wiki/Emulator">emulator</a> in
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<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> mode as follows:</p>
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<div class="sourceCode" id="cb5"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb5-1"><a href="#cb5-1" aria-hidden="true" tabindex="-1"></a><span class="fu">wget</span> http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/basic-2-c000.901465-01.bin</span>
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<span id="cb5-2"><a href="#cb5-2" aria-hidden="true" tabindex="-1"></a><span class="fu">wget</span> http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/basic-2-d000.901465-02.bin</span>
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<span id="cb5-3"><a href="#cb5-3" aria-hidden="true" tabindex="-1"></a><span class="fu">wget</span> http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/edit-2-n.901447-24.bin</span>
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<span id="cb5-4"><a href="#cb5-4" aria-hidden="true" tabindex="-1"></a><span class="fu">wget</span> http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/kernal-2.901465-03.bin</span></code></pre></div>
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<p>We then created:</p>
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<div class="sourceCode" id="cb6"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb6-1"><a href="#cb6-1" aria-hidden="true" tabindex="-1"></a><span class="fu">dd</span> bs=2k count=1 if=/dev/zero of=nullfill.bin</span></code></pre></div>
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<p>For your convenience, we have added the above mentioned files to this entry directory.
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They were used to form the <code>pet.rom</code> file.</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<p>This program is not only a complete <a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">Motorola 6502
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processor</a>
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<a href="https://en.wikipedia.org/wiki/Emulator">emulator</a>, but also an emulation of the
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<a href="https://en.wikipedia.org/wiki/Commodore_PET">Commodore PET 2001</a>.</p>
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<p>This is the second version of the same entry, but this one takes care to
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not include any possibly copyrighted items in the info files, to be sure
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to not infringe the rules.</p>
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<h3 id="test">Test</h3>
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<p>Compile the program, then test the
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<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
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<a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> like this:</p>
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<div class="sourceCode" id="cb7"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb7-1"><a href="#cb7-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./sykes</span> 6502test</span></code></pre></div>
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<p>A basic test is done for each instruction and addressing mode, all tests
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should pass. At the end of the tests, it loops forever - break out with
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control-C.</p>
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<h3 id="pet-emulation">PET EMULATION</h3>
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<p>Cast your mind back to 1977… a little company called
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<a href="https://en.wikipedia.org/wiki/Commodore_International">Commodore</a> introduced
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the <a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a>, the Personal Electronic
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Transactor.</p>
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<p>The <a href="https://en.wikipedia.org/wiki/Computer">machine</a> was a hit, and
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<a href="https://en.wikipedia.org/wiki/History">history</a> was made.</p>
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<p>Now you can relive those wonderful times with this
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<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> emulator!</p>
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<p>Make sure you have a <a href="https://en.wikipedia.org/wiki/Terminal_emulator">terminal
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window</a> of 40x25 chars or
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bigger, and then run the emulator like this:</p>
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<div class="sourceCode" id="cb8"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb8-1"><a href="#cb8-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./sykes</span> pet.rom</span></code></pre></div>
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<p>You should see the startup message. Try typing in some
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<a href="https://en.wikipedia.org/wiki/BASIC">BASIC</a> - for instance:</p>
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<pre><code>PRINT "HELLO, WORLD"</code></pre>
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<p>There is an optional numeric parameter, which controls the speed. For a
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slower cursor blink, try</p>
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<div class="sourceCode" id="cb10"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb10-1"><a href="#cb10-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./sykes</span> pet.rom 6</span></code></pre></div>
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<p>and for faster</p>
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<div class="sourceCode" id="cb11"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb11-1"><a href="#cb11-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./sykes</span> pet.rom 2</span></code></pre></div>
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<p>The default is 4.</p>
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<p>The control keys are as follows:</p>
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<pre><code>^A HOME
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^L CLR
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^R RVS
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^E OFF
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^Y INST
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^X STOP (break)
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^F cursor forward
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^B cursor back
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^N cursor down</code></pre>
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<p>Supplied also is a short demo program written in
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<a href="https://en.wikipedia.org/wiki/BASIC">BASIC</a>. Try typing</p>
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<pre><code>LOAD "DEMO"
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RUN</code></pre>
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<p>Many other old programs will run in this emulator too. Files with a <code>.PRG</code>
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extension should work. (Look, for instance, here:
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<a href="http://www.zimmers.net/anonftp/pub/cbm/pet/ALLFILES.html" class="uri">http://www.zimmers.net/anonftp/pub/cbm/pet/ALLFILES.html</a>,<br />
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or try this one: <a href="http://www.zimmers.net/anonftp/pub/cbm/pet/games/english/dungeon.prg" class="uri">http://www.zimmers.net/anonftp/pub/cbm/pet/games/english/dungeon.prg</a>)<br />
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The filenames must be upper case in order to be loaded by the emulator.</p>
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<p>You can save programs too - try</p>
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<pre><code>10 PRINT "HELLO!"
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SAVE "HELLO"
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NEW
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LOAD "HELLO"
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RUN</code></pre>
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<p>You also might try typing this to see an ancient <a href="https://en.wikipedia.org/wiki/Easter_egg_(media)#Software">Easter egg</a>:</p>
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<pre><code>WAIT 6502,12</code></pre>
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<h3 id="emulation">6502 EMULATION</h3>
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<p>The program is basically a
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<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
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<a href="https://en.wikipedia.org/wiki/Emulator">emulator</a>, and it does NOT need the
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<a href="https://en.wikipedia.org/wiki/Commodore_PET">Commodore</a>
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<a href="https://en.wikipedia.org/wiki/ROM_image">ROM</a> to work.</p>
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<p>Supplied as a demonstration is a
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compiled-for-<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
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version a chess program (heh, I found a use for a previous losing entry :) ). Try:</p>
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<div class="sourceCode" id="cb16"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb16-1"><a href="#cb16-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./sykes</span> chess</span></code></pre></div>
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<p>It works as you would expect (it plays very badly). There’s no castling
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or en-passant, and to win you must actually take the opponent’s king.</p>
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<p>You can write your own programs too, any <a href="https://en.wikibooks.org/wiki/6502_Assembly">6502
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assembler</a> should work.</p>
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<p>The <a href="https://en.wikipedia.org/wiki/Emulator">emulator</a> loads the supplied file
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at <code>$C000</code>, and starts execution from that address also (the reset vector is
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ignored).</p>
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<p>The screen memory begins at <code>$8000</code>, and is <code>40 columns * 25 rows</code>.
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Key presses appear when they occur in memory location <code>$A2</code>, and are
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<a href="https://en.wikipedia.org/wiki/Bitwise_operation#OR">OR</a>ed
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with <code>$80</code> - this is a way of indicating a fresh character. The program
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can frequently check this byte, and when it sees a new character, it can
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<a href="https://en.wikipedia.org/wiki/Bitwise_operation#AND">AND</a> it with <code>$7F</code> to
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indicate that it has been read.</p>
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<p>The
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<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
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<a href="https://en.wikipedia.org/wiki/Emulator">emulator</a> receives an interrupt 60
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times a second or so, you may want to disable interrupts (with the <code>SEI</code>
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instruction) if you do not need this.</p>
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<p>In
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<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
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<a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> mode the special
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<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> character codes are not used and
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the screen understands normal
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<a href="https://en.wikipedia.org/wiki/ASCII#Character_set">ASCII</a>.</p>
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<p>Lastly, before <a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> starts,
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the low byte from a <code>time(3)</code> call is placed at address 0 - this can be used as a
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random seed.</p>
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<h3 id="technical-description">Technical description</h3>
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<p>Most of the program comprises the
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<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
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<a href="https://en.wikipedia.org/wiki/Emulator">emulator</a>. <code>curses</code> is used for the
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screen and keyboard handling.</p>
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<p>Much of the obfuscation comes from the need to squeeze in the
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<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
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<a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> as well as faking enough of
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the <a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> hardware for it to work.</p>
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<p>If the supplied file is exactly 16384 bytes, the
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<a href="https://en.wikipedia.org/wiki/Emulator">emulator</a> assumes it is a
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<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a>
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<a href="https://en.wikipedia.org/wiki/ROM_image">ROM</a>, and goes into PET emulation
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mode. Otherwise some PET specific features are skipped during normal
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<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
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<a href="https://en.wikipedia.org/wiki/Emulator">emulation</a>.</p>
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<p>The main processing all happens in a heroic expression containing no
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less than 64 ternary operators (after <code>cpp</code>) starting on <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/sykes.c#L56">line
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56</a>.
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This decodes the
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<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
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instructions according to a table and executes them.</p>
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<p>The addressing mode is decoded in a similar expression starting on <a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/sykes.c#L53">line
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53</a>.</p>
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<h3 id="bugs">Bugs</h3>
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<p>The machine emulated is an older 40 column
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<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a>, so 80 column programs
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will not show correctly.</p>
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<p>There is no <a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> of
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<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> graphics characters.</p>
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<p>The parameter controls the speed of the 60Hz “jiffy clock”, and not the
|
||
processor speed. This means many games may run too fast to be usable -
|
||
it really depends on the speed of your machine.</p>
|
||
<p>Although the PET <a href="https://en.wikipedia.org/wiki/Emulator">emulator</a> can do <code>LOAD</code>
|
||
and <code>SAVE</code>, it cannot <code>VERIFY</code> or <code>OPEN</code> and <code>CLOSE</code> files.</p>
|
||
<p>The <a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> hardware
|
||
<a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> is not at all complete -
|
||
features such as the hardware timers are completely missing. Some programs will
|
||
not run correctly.</p>
|
||
<p>The
|
||
<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
|
||
<a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> does not include the seldom
|
||
used decimal mode, or any of the “undocumented” instructions.</p>
|
||
<h3 id="important-note">IMPORTANT NOTE</h3>
|
||
<p>I think it is great fun to run the
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a>
|
||
<a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> and mess around with
|
||
<a href="https://en.wikipedia.org/wiki/Microsoft">Microsoft</a>
|
||
<a href="https://en.wikipedia.org/wiki/BASIC">BASIC</a>. However, this obviously needs the
|
||
<a href="https://en.wikipedia.org/wiki/ROM_image">ROM</a> file to work. My
|
||
program is original and completely free of any copyright, but, of
|
||
course, the <code>pet.rom</code> is not my work. So I ask the user to download it
|
||
from the Internet. This is to avoid directly infringing any copyright.</p>
|
||
<h3 id="finally">Finally</h3>
|
||
<p>What does this do?</p>
|
||
<div class="sourceCode" id="cb17"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb17-1"><a href="#cb17-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./sykes</span> pet.rom <span class="at">-1</span></span></code></pre></div>
|
||
<p>Have fun!</p>
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
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|
||
|
||
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|
||
|
||
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|
||
|
||
<h1 id="inventory-for-2005sykes"><a name="inventory"></a>Inventory for 2005/sykes</h1>
|
||
<p><a href="#top">Jump to top</a></p>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/sykes.c">sykes.c</a> - entry source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/sykes.orig.c">sykes.orig.c</a> - original source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/test.sh">test.sh</a> - test tool</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/try.sh">try.sh</a> - how to run</li>
|
||
<li><a href="2005_sykes.tar.bz2">2005_sykes.tar.bz2</a> - download entry source</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="index.html">index.html</a> - entry home page</li>
|
||
<li><a href="6502test">6502test</a> - 6502 test utility</li>
|
||
<li><a href="DEMO">DEMO</a> - demo for Commodore PET</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/PET">PET</a> - Commodore PET emulator</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/README.md">README.md</a> - markdown source for index.html</li>
|
||
<li><a href="basic-2-c000.901465-01.bin">basic-2-c000.901465-01.bin</a> - BASIC binary for Commodore PET</li>
|
||
<li><a href="basic-2-d000.901465-02.bin">basic-2-d000.901465-02.bin</a> - BASIC binary for Commodore PET</li>
|
||
<li><a href="chess">chess</a> - chess program for Commodore PET</li>
|
||
<li><a href="edit-2-n.901447-24.bin">edit-2-n.901447-24.bin</a> - editor for Commodore PET</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/.entry.json">.entry.json</a> - description of entry in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="kernel-2.901465-03.bin">kernel-2.901465-03.bin</a> - Commodore PET kernel</li>
|
||
<li><a href="nullfill.bin">nullfill.bin</a> - block of binary zeros</li>
|
||
<li><a href=".path">.path</a> - directory path from top directory</li>
|
||
</ul>
|
||
|
||
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</div>
|
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|
||
</div>
|
||
|
||
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|
||
<!-- START: this line starts content from: inc/footer.default.html -->
|
||
|
||
<!--
|
||
|
||
Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
<h2>Copyright and CC BY-SA 4.0 License</h2>
|
||
<p>This file and web page is:</p>
|
||
<blockquote><b>Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></p></blockquote>
|
||
<p>You are free to share and adapt this file under the terms of this license:</p>
|
||
<blockquote><b>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</b></blockquote>
|
||
<p>For more information, see:</p>
|
||
<blockquote><a
|
||
href="https://creativecommons.org/licenses/by-sa/4.0/">https://creativecommons.org/licenses/by-sa/4.0/</a></blockquote>
|
||
<h2>Coda</h2>
|
||
<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2005%2Fsykes%2Findex.html">Nu HTML check this web page</a></p>
|
||
<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
|
||
</div>
|
||
|
||
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|
||
</body>
|
||
</html>
|
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|
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