This is a large update that modifies every .entry.json file and fixes
many others. The changes of every .entry.json file are as follows:
- change 'entry source' to 'entry source code' [0]
- change 'original source' to 'original source code' [0]
- change 'directory path from top directory' to 'directory path from top
level directory'
[0] This is for consistency purposes. Other options were pondered but as
the index.html files refer to 'Alternate code' this was the simplest way
to go about it and it also feels more natural. A question was whether to
have 'entry code' and 'original entry code' or to have the word 'source'
added to it but I decided upon including the word 'source'. Another
question has occurred to me is whether or not 'original source code'
should instead be 'original entry source code' but that can be decided
upon later as that occurred to me after much of the files were already
rebuilt. The consistency that this commit has made is for the README.md
sections and in particular 'Alternate code'. One might wonder if that
should be changed to 'Alternate source code' as now the manifest
includes 'source' in the 'entry code' and 'original code' but the
manifest itself is what was actually updated and having 'source' feels
more natural for submitted files. After all not all entries have
alternate code. These questions can be decided on when looking at the
index.html files that have been rebuilt.
Changed 'alt code' to 'alternate code' where this was not already done
(in the manifest). It is questionable whether this should be done in
markdown files or not (in the README.md files section it already is done
but not necessarily in other places).
Many files had incorrect descriptions that have been checked.
Renamed 2020/endoh2/spoiler/spoiler.{md,html} to index.{md,html} so one
can go to just 2020/endoh2/spoiler and see the web page. Although the
manifest of 2 020/endoh2/index.html will link to it and that's probably
how most people will notice it it seems useful especially as the web
page links to the different files in spoiler/ or at least refers to
them, giving a description (kind of like the manifest in
2020/endoh2/index.html).
Due to the above changes all the entries had their index.html files
regenerated too.
There were likely other changes and fixes as well.
What has NOT been done is a check over all items, typos or otherwise,
though some typos have been fixed. Nonetheless this commit goes a long
way to resolving issue #1933.
Updated thanks file both with a missing <div> id and added a manifest
improvements section as the manifest is quite important.
711 lines
30 KiB
HTML
711 lines
30 KiB
HTML
<!DOCTYPE html>
|
||
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
|
||
<!-- START: two lines up starts content from: inc/top.default.html -->
|
||
|
||
<!-- END: this line ends content from: inc/top.default.html -->
|
||
<!-- START: this line starts content from: inc/head.default.html -->
|
||
|
||
<head>
|
||
<link rel="stylesheet" href="../../ioccc.css">
|
||
<link href="https://fonts.googleapis.com/css2?family=Outfit:wght@100..900&display=swap" rel="stylesheet">
|
||
<meta charset="utf-8">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
|
||
<title>2005/sykes - Best Emulator</title>
|
||
<link rel="icon" type="image/x-icon" href="../../favicon.ico">
|
||
<meta name="description" content="2005 IOCCC entry sykes - Best Emulator">
|
||
<meta name="keywords" content="IOCCC, 2005, IOCCC 2005, IOCCC entry, sykes, Best Emulator">
|
||
</head>
|
||
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
|
||
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
|
||
<!-- !!! DO NOT MODIFY THIS FILE - This file is generated by a tool !!! -->
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
|
||
<!-- END: this line ends content from: inc/head.default.html -->
|
||
|
||
<!-- -->
|
||
<!-- This web page was formed via the tool: bin/readme2index.sh -->
|
||
<!-- The content of main section of this web page came from: 2005/sykes/README.md -->
|
||
<!-- -->
|
||
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
<!-- !!! Do not modify this web page, instead modify the file: 2005/sykes/README.md !!! -->
|
||
<!-- !!! Do not modify this web page, instead modify the file: 2005/sykes/README.md !!! -->
|
||
<!-- !!! Do not modify this web page, instead modify the file: 2005/sykes/README.md !!! -->
|
||
<!-- !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! -->
|
||
|
||
<!-- Markdown content was converted into HTML via the tool: bin/md2html.sh -->
|
||
|
||
<!-- START: this line starts content from: inc/body.default.html -->
|
||
|
||
<body>
|
||
|
||
<!-- END: this line ends content from: inc/body.default.html -->
|
||
<!-- START: this line starts content from: inc/topbar.default.html -->
|
||
|
||
<div class="theader">
|
||
<nav class="topbar">
|
||
<div class="container">
|
||
<div class="logo">
|
||
<a href="../../index.html" class="logo-link">
|
||
IOCCC
|
||
</a>
|
||
</div>
|
||
|
||
<div class="topbar-items">
|
||
<div class="item">
|
||
<span class="item-header">
|
||
Entries
|
||
</span>
|
||
|
||
<div class="sub-item">
|
||
<div class="outfit-font">
|
||
<a href="../../years.html" class="sub-item-link">
|
||
Winning Entries
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../authors.html" class="sub-item-link">
|
||
People who have won
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../location.html" class="sub-item-link">
|
||
Location of authors
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../bugs.html" class="sub-item-link">
|
||
Bugs & (Mis)features
|
||
</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="item">
|
||
<span class="item-header">
|
||
Status
|
||
</span>
|
||
|
||
<div class="sub-item">
|
||
<div class="outfit-font">
|
||
<a href="../../news.html" class="sub-item-link">
|
||
IOCCC News
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../status.html" class="sub-item-link">
|
||
Contest status
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../next/index.html" class="sub-item-link">
|
||
Rules & Guidelines
|
||
</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="item">
|
||
<span class="item-header">
|
||
FAQ
|
||
</span>
|
||
|
||
<div class="sub-item">
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html" class="sub-item-link">
|
||
FAQ
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html#submit" class="sub-item-link">
|
||
How to enter the IOCCC
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html#fix_an_entry" class="sub-item-link">
|
||
Fixing IOCCC entries
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html#fix_web_site" class="sub-item-link">
|
||
Fixing the web site
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../faq.html#fix_author" class="sub-item-link">
|
||
Fixing author info
|
||
</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="item">
|
||
<span class="item-header">
|
||
About
|
||
</span>
|
||
|
||
<div class="sub-item">
|
||
<div class="outfit-font">
|
||
<a href="../../index.html" class="sub-item-link">
|
||
IOCCC Home
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../judges.html" class="sub-item-link">
|
||
The IOCCC Judges
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../contact.html" class="sub-item-link">
|
||
Contacting the IOCCC
|
||
</a>
|
||
</div>
|
||
|
||
<div class="outfit-font">
|
||
<a href="../../thanks-for-help.html" class="sub-item-link">
|
||
Thanks for the help
|
||
</a>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</nav>
|
||
|
||
<div class="header-mobile-menu">
|
||
<noscript>
|
||
<a href="../../nojs-menu.html" class="topbar-js-label">
|
||
Please Enable JavaScript
|
||
</a>
|
||
</noscript>
|
||
|
||
<button id="header-open-menu-button" class="topbar-mobile-menu">
|
||
<img
|
||
src="../../png/hamburger-icon-open.png"
|
||
alt="hamburger style menu icon - open state"
|
||
width=48
|
||
height=48>
|
||
</button>
|
||
|
||
<button id="header-close-menu-button" class="hide-content">
|
||
<img
|
||
src="../../png/hamburger-icon-closed.png"
|
||
alt="hamburger style menu icon - closed state"
|
||
width=48
|
||
height=48>
|
||
</button>
|
||
|
||
<div id="mobile-menu-panel" class="hide-content">
|
||
<div class="mobile-menu-container">
|
||
|
||
<div class="mobile-menu-wrapper">
|
||
<div class="mobile-menu-item">
|
||
Entries
|
||
</div>
|
||
<div class="mobile-submenu-wrapper">
|
||
|
||
<a class="mobile-submenu-item" href="../../years.html">
|
||
Winning Entries
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../authors.html">
|
||
People who have won
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../location.html">
|
||
Location of authors
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../bugs.html">
|
||
Bugs & (Mis)features
|
||
</a>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="mobile-menu-wrapper">
|
||
|
||
<div class="mobile-menu-item">
|
||
Status
|
||
</div>
|
||
<div class="mobile-submenu-wrapper">
|
||
|
||
<a class="mobile-submenu-item" href="../../status.html">
|
||
Contest status
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../next/index.html">
|
||
Rules & Guidelines
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../news.html">
|
||
IOCCC News
|
||
</a>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="mobile-menu-wrapper">
|
||
<div class="mobile-menu-item">
|
||
FAQ
|
||
</div>
|
||
<div class="mobile-submenu-wrapper">
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html">
|
||
Frequently Asked Questions
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html#submit">
|
||
How to enter the IOCCC
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html#fix_an_entry">
|
||
Fixing IOCCC entries
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html#fix_web_site">
|
||
Fixing the web site
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../faq.html#fix_author">
|
||
Fixing author info
|
||
</a>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
<div class="mobile-menu-wrapper">
|
||
<div class="mobile-menu-item">
|
||
About
|
||
</div>
|
||
<div class="mobile-submenu-wrapper">
|
||
|
||
<a class="mobile-submenu-item" href="../../index.html">
|
||
IOCCC Home
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../judges.html">
|
||
The IOCCC Judges
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../contact.html">
|
||
Contacting the IOCCC
|
||
</a>
|
||
|
||
<a class="mobile-submenu-item" href="../../thanks-for-help.html">
|
||
Thanks for the help
|
||
</a>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
</div>
|
||
</div>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
<script>
|
||
var headerOpenMenuButton = document.getElementById("header-open-menu-button");
|
||
var headerCloseMenuButton = document.getElementById("header-close-menu-button");
|
||
var mobileMenuPanel = document.getElementById("mobile-menu-panel");
|
||
|
||
headerOpenMenuButton.addEventListener("click", () => {
|
||
headerOpenMenuButton.classList.remove("topbar-mobile-menu");
|
||
headerOpenMenuButton.classList.add("hide-content");
|
||
|
||
headerCloseMenuButton.classList.remove("hide-content");
|
||
headerCloseMenuButton.classList.add("topbar-mobile-menu");
|
||
|
||
mobileMenuPanel.classList.remove("hide-content");
|
||
mobileMenuPanel.classList.add("topbar-mobile-panel");
|
||
});
|
||
|
||
headerCloseMenuButton.addEventListener("click", () => {
|
||
headerCloseMenuButton.classList.remove("topbar-mobile-menu");
|
||
headerCloseMenuButton.classList.add("hide-content");
|
||
|
||
mobileMenuPanel.classList.add("hide-content");
|
||
mobileMenuPanel.classList.remove("topbar-mobile-panel");
|
||
|
||
headerOpenMenuButton.classList.add("topbar-mobile-menu");
|
||
headerOpenMenuButton.classList.remove("hide-content");
|
||
});
|
||
</script>
|
||
|
||
<!-- END: this line ends content from: inc/topbar.default.html -->
|
||
<!-- START: this line starts content from: inc/header.default.html -->
|
||
|
||
<div class="header">
|
||
<a href="../../2011/zucker/index.html">
|
||
<img src="../../png/ioccc.png"
|
||
alt="IOCCC image by Matt Zucker"
|
||
width=300
|
||
height=110>
|
||
</a>
|
||
<h1>The International Obfuscated C Code Contest</h1>
|
||
<h2>2005/sykes - Best Emulator</h2>
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/header.default.html -->
|
||
<!-- START: this line starts content from: inc/navbar.mid.html -->
|
||
|
||
<div class="navbar">
|
||
<a class="Left" href="../persano/index.html">← persano</a>
|
||
<a class="Left" href="../index.html">↑ 2005 ↑</a>
|
||
<a class="Left" href="../timwi/index.html">timwi →</a>
|
||
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/sykes.c">C code</a>
|
||
<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/Makefile">Makefile</a>
|
||
<a class="Right" href="#inventory">Inventory</a>
|
||
<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2005%2Fsykes%2Findex.html">✓</a>
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/navbar.mid.html -->
|
||
<!-- START: this line starts content from: inc/before-content.default.html -->
|
||
|
||
<div class="content" id="content">
|
||
|
||
<!-- END: this line ends content from: inc/before-content.default.html -->
|
||
<!-- START: this line starts content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-author.sh -->
|
||
|
||
<h2 id="author">Author:</h2>
|
||
<ul>
|
||
<li>Name: <a href="../../authors.html#Stephen_Sykes">Stephen Sykes</a><br>
|
||
Location: <a href="../../location.html#FI">FI</a> - <em>Republic of Finland </em> (<em>Finland</em>)</li>
|
||
</ul>
|
||
|
||
<!-- END: next line ends content generated by: bin/output-index-author.sh -->
|
||
|
||
<!-- END: this line ends content for HTML phase 20 by: bin/output-index-author.sh via bin/md2html.sh -->
|
||
<!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
|
||
|
||
<!-- BEFORE: 1st line of markdown file: 2005/sykes/README.md -->
|
||
<h2 id="to-build">To build:</h2>
|
||
<pre><code> make</code></pre>
|
||
<h3 id="bugs-and-misfeatures">Bugs and (Mis)features:</h3>
|
||
<p>The current status of this entry is:</p>
|
||
<pre><code> STATUS: INABIAF - please **DO NOT** fix</code></pre>
|
||
<p>For more detailed information see <a href="../../bugs.html#2005_sykes">2005/sykes in bugs.html</a>.</p>
|
||
<h2 id="to-use">To use:</h2>
|
||
<pre><code> ./sykes binary_file</code></pre>
|
||
<h2 id="try">Try:</h2>
|
||
<pre><code> ./try.sh</code></pre>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>For those who fondly remember their first
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a>, this entry will start you
|
||
down memory lane … starting with <code>$C000</code> of course!</p>
|
||
<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
|
||
56</a>,
|
||
after the C pre-processor gets finished with it!</p>
|
||
<p>We downloaded the <a href="https://en.wikipedia.org/wiki/ROM_image">ROM</a> contents to use
|
||
the <a href="https://en.wikipedia.org/wiki/Emulator">emulator</a> in
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> mode as follows:</p>
|
||
<pre><code> wget http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/basic-2-c000.901465-01.bin
|
||
wget http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/basic-2-d000.901465-02.bin
|
||
wget http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/edit-2-n.901447-24.bin
|
||
wget http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/pet/kernal-2.901465-03.bin</code></pre>
|
||
<p>We then created:</p>
|
||
<pre><code> dd bs=2k count=1 if=/dev/zero of=nullfill.bin</code></pre>
|
||
<p>For your convenience, we have added the above mentioned files to this entry directory.
|
||
They were used to form the <code>pet.rom</code> file.</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<p>This program is not only a complete <a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">Motorola 6502
|
||
processor</a>
|
||
<a href="https://en.wikipedia.org/wiki/Emulator">emulator</a>, but also an emulation of the
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">Commodore PET 2001</a>.</p>
|
||
<p>This is the second version of the same entry, but this one takes care to
|
||
not include any possibly copyrighted items in the info files, to be sure
|
||
to not infringe the rules.</p>
|
||
<h3 id="test">Test</h3>
|
||
<p>Compile the program, then test 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> like this:</p>
|
||
<pre><code> ./sykes 6502test</code></pre>
|
||
<p>A basic test is done for each instruction and addressing mode, all tests
|
||
should pass. At the end of the tests, it loops forever - break out with
|
||
control-C.</p>
|
||
<h3 id="pet-emulation">PET EMULATION</h3>
|
||
<p>Cast your mind back to 1977… a little company called
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_International">Commodore</a> introduced
|
||
the <a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a>, the Personal Electronic
|
||
Transactor.</p>
|
||
<p>The <a href="https://en.wikipedia.org/wiki/Computer">machine</a> was a hit, and
|
||
<a href="https://en.wikipedia.org/wiki/History">history</a> was made.</p>
|
||
<p>Now you can relive those wonderful times with this
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> emulator!</p>
|
||
<p>Make sure you have a <a href="https://en.wikipedia.org/wiki/Terminal_emulator">terminal
|
||
window</a> of 40x25 chars or
|
||
bigger, and then run the emulator like this:</p>
|
||
<pre><code> ./sykes pet.rom</code></pre>
|
||
<p>You should see the startup message. Try typing in some
|
||
<a href="https://en.wikipedia.org/wiki/BASIC">BASIC</a> - for instance:</p>
|
||
<pre><code> PRINT "HELLO, WORLD"</code></pre>
|
||
<p>There is an optional numeric parameter, which controls the speed. For a
|
||
slower cursor blink, try</p>
|
||
<pre><code> ./sykes pet.rom 6</code></pre>
|
||
<p>and for faster</p>
|
||
<pre><code> ./sykes pet.rom 2</code></pre>
|
||
<p>The default is 4.</p>
|
||
<p>The control keys are as follows:</p>
|
||
<pre><code> ^A HOME
|
||
^L CLR
|
||
^R RVS
|
||
^E OFF
|
||
^Y INST
|
||
^X STOP (break)
|
||
^F cursor forward
|
||
^B cursor back
|
||
^N cursor down</code></pre>
|
||
<p>Supplied also is a short demo program written in
|
||
<a href="https://en.wikipedia.org/wiki/BASIC">BASIC</a>. Try typing</p>
|
||
<pre><code> LOAD "DEMO"
|
||
RUN</code></pre>
|
||
<p>Many other old programs will run in this emulator too. Files with a <code>.PRG</code>
|
||
extension should work. Look, for instance, here:</p>
|
||
<p><a href="http://www.zimmers.net/anonftp/pub/cbm/pet/ALLFILES.html">http://www.zimmers.net/anonftp/pub/cbm/pet/ALLFILES.html</a></p>
|
||
<p>or try this one:</p>
|
||
<p><a href="http://www.zimmers.net/anonftp/pub/cbm/pet/games/english/dungeon.prg">http://www.zimmers.net/anonftp/pub/cbm/pet/games/english/dungeon.prg</a></p>
|
||
<p>The filenames must be upper case in order to be loaded by the emulator.</p>
|
||
<p>You can save programs too - try</p>
|
||
<pre><code> 10 PRINT "HELLO!"
|
||
SAVE "HELLO"
|
||
NEW
|
||
|
||
LOAD "HELLO"
|
||
RUN</code></pre>
|
||
<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>
|
||
<pre><code> WAIT 6502,12</code></pre>
|
||
<h3 id="emulation">6502 EMULATION</h3>
|
||
<p>The program is basically a
|
||
<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
|
||
<a href="https://en.wikipedia.org/wiki/Emulator">emulator</a>, and it does NOT need the
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">Commodore</a>
|
||
<a href="https://en.wikipedia.org/wiki/ROM_image">ROM</a> to work.</p>
|
||
<p>Supplied as a demonstration is a
|
||
compiled-for-<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
|
||
version a chess program (heh, I found a use for a previous losing entry :) ). Try:</p>
|
||
<pre><code> ./sykes chess</code></pre>
|
||
<p>It works as you would expect (it plays very badly). There’s no castling
|
||
or en-passant, and to win you must actually take the opponent’s king.</p>
|
||
<p>You can write your own programs too, any <a href="https://en.wikibooks.org/wiki/6502_Assembly">6502
|
||
assembler</a> should work.</p>
|
||
<p>The <a href="https://en.wikipedia.org/wiki/Emulator">emulator</a> loads the supplied file
|
||
at <code>$C000</code>, and starts execution from that address also (the reset vector is
|
||
ignored).</p>
|
||
<p>The screen memory begins at <code>$8000</code>, and is <code>40 columns * 25 rows</code>.
|
||
Key presses appear when they occur in memory location <code>$A2</code>, and are
|
||
<a href="https://en.wikipedia.org/wiki/Bitwise_operation#OR">OR</a>ed
|
||
with <code>$80</code> - this is a way of indicating a fresh character. The program
|
||
can frequently check this byte, and when it sees a new character, it can
|
||
<a href="https://en.wikipedia.org/wiki/Bitwise_operation#AND">AND</a> it with <code>$7F</code> to
|
||
indicate that it has been read.</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">emulator</a> receives an interrupt 60
|
||
times a second or so, you may want to disable interrupts (with the <code>SEI</code>
|
||
instruction) if you do not need this.</p>
|
||
<p>In
|
||
<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
|
||
<a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> mode the special
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> character codes are not used and
|
||
the screen understands normal
|
||
<a href="https://en.wikipedia.org/wiki/ASCII#Character_set">ASCII</a>.</p>
|
||
<p>Lastly, before <a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> starts,
|
||
the low byte from a <code>time(3)</code> call is placed at address 0 - this can be used as a
|
||
random seed.</p>
|
||
<h3 id="technical-description">Technical description</h3>
|
||
<p>Most of the program comprises the
|
||
<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
|
||
<a href="https://en.wikipedia.org/wiki/Emulator">emulator</a>. <code>curses</code> is used for the
|
||
screen and keyboard handling.</p>
|
||
<p>Much of the obfuscation comes from the need to squeeze in 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> as well as faking enough of
|
||
the <a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> hardware for it to work.</p>
|
||
<p>If the supplied file is exactly 16384 bytes, the
|
||
<a href="https://en.wikipedia.org/wiki/Emulator">emulator</a> assumes it is a
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a>
|
||
<a href="https://en.wikipedia.org/wiki/ROM_image">ROM</a>, and goes into PET emulation
|
||
mode. Otherwise some PET specific features are skipped during normal
|
||
<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
|
||
<a href="https://en.wikipedia.org/wiki/Emulator">emulation</a>.</p>
|
||
<p>The main processing all happens in a heroic expression containing no
|
||
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
|
||
56</a>.
|
||
This decodes the
|
||
<a href="https://en.wikipedia.org/wiki/MOS_Technology_6502#Technical_description">6502</a>
|
||
instructions according to a table and executes them.</p>
|
||
<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
|
||
53</a>.</p>
|
||
<h3 id="bugs">Bugs</h3>
|
||
<p>The machine emulated is an older 40 column
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a>, so 80 column programs
|
||
will not show correctly.</p>
|
||
<p>There is no <a href="https://en.wikipedia.org/wiki/Emulator">emulation</a> of
|
||
<a href="https://en.wikipedia.org/wiki/Commodore_PET">PET</a> graphics characters.</p>
|
||
<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>
|
||
<pre><code> ./sykes pet.rom -1</code></pre>
|
||
<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/
|
||
|
||
-->
|
||
<!-- AFTER: last line of markdown file: 2005/sykes/README.md -->
|
||
|
||
<!-- END: this line ends content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
|
||
<!-- START: this line starts content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-2005sykes">Inventory for 2005/sykes</h1>
|
||
</div>
|
||
<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 code</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 code</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> - script to try entry</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2005_sykes.tar.bz2">2005_sykes.tar.bz2</a> - download entry tarball</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 this web page</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> - entry summary and manifest 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="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2005/sykes/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
|
||
|
||
<!-- END: next line ends content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<!-- END: this line ends content for HTML phase 22 by: bin/output-index-inventory.sh via bin/md2html.sh -->
|
||
<!-- START: this line starts content from: inc/after-content.default.html -->
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||
<!-- 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">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2024 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>This work is licensed by Landon Curt Noll under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"></p>
|
||
<p>You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.</p>
|
||
<p>You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>.</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2005%2Fsykes%2Findex.html" rel="nofollow">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>
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/footer.default.html -->
|
||
<!-- START: this line starts content from: inc/bottom.default.html -->
|
||
|
||
</body>
|
||
</html>
|
||
|
||
<!-- END: this line ends content from: inc/bottom.default.html -->
|