2013-10-10 18:03:07 +00:00
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<!-- -*- mode: HTML; indent-tabs-mode: nil -*- -->
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2016-11-22 05:17:34 +00:00
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<!-- Copyright 2010-2016 Will Scullin -->
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2013-10-10 18:03:07 +00:00
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<html>
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<base href="/apple" />
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<meta name="keywords" content="apple2,apple,ii,javascript,emulator,html5" />
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<title>About Apple ][js/Apple //jse</title>
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2016-11-22 05:17:34 +00:00
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2013-10-10 18:03:07 +00:00
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2016-11-22 05:17:34 +00:00
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2013-10-10 18:03:07 +00:00
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2016-11-22 05:17:34 +00:00
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2013-10-10 18:03:07 +00:00
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</script>
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<meta property="og:title" content="About Apple ][js" />
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<meta property="og:type" content="website" />
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<meta property="og:description" content="Apple ][js is an Apple ][ (or Apple II or Apple2) emulator written using only JavaScript and HTML5." />
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</head>
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<body id="about">
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<div style="text-align: center">
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<span class="motter" style="font-size: 2em">Apple ][js and //jse</span>
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</div>
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<div style="max-width: 800px; margin: auto">
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<h2>What is this?</h2>
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2016-11-22 05:17:34 +00:00
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<span class="motter"><a href="../apple2/">Apple ][js</a></span> and
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2013-10-10 18:03:07 +00:00
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<span class="motter"><a href="../apple//e">Apple //jse</a></span>
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are Apple ][ and Apple //e emulators written entirely in JavaScript
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and HTML5.
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<h2>Updates (2013-07-04)</h2>
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<ul>
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<li><h3>RAMFactor Emulation (//jse)</h3>
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I now simulate having a 1 Megabyte RAMFactor card in slot 2.
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<li><h3>Thunderclock Emulation (//jse)</h3>
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There is cursory emulation of the Thunderclock card, enough
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to keep ProDOS applications from asking you to enter the date
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2013-10-10 18:03:07 +00:00
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all the time. ProDOS attempts to guess the year from the month,
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the day and the day of the week, something that needs to be
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patched every 6 years. This means newer versions think it's 1996,
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older versions are stuck in the 80s.
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<li><h3>Firefox Nightly Joystick Support</h3>
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Joystick support has yet to officially land, but the latest
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nightlies support the gamepad API.
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</li>
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</ul>
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<h2>Updates (2013-03-20)</h2>
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<ul>
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<li><h3>Animation Frames</h3>
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I've switched from using setInterval() to requestAnimationFrame() where
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supported. This, in conjunction with the graphics re-write, seems
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to smooth performance and provide a more stable CPU speed.
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<li><h3>Graphics Re-Write</h3>
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This (third) re-write of the graphics system should improve performance
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with graphics intensive programs. Rather than rendering each graphics
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update as it happens, updates are rendered each animation frame.
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</li>
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</ul>
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<h2>Updates (2013-03-12)</h2>
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<ul>
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<li><h3>Apple //e</h3>
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After much flailing, and much staring at MMU emulation code in
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despair, I've finally published my Apple //e emulator. It's probably
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a little more rough than I'd hoped, but it has a lot of features
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that I really wanted to get into it, like basic double hires support,
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and it uses the enhanced Apple //e ROMs.
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</li>
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</ul>
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<h2>Updates (2013-02-25)</h2>
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<ul>
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<li><h3>Joystick Support</h3>
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Chrome only so far, the nascent gamepad API has finally allowed me
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to add basic joystick support. I can now re-live my glory days
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of Skyfox.
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</li>
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<li><h3>Re-written CPU emulator</h3>
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I finally got around to applying some of the many lessons I learned
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along the way writing my first CPU emulator in Javascript. The
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last re-working gave me about a 100% performance gain.
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</li>
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<li><h3>Finally Fixed Oregon Trail</h3>
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This seems to have been a major disappointment for many people.
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I was able to make it as a banker, but I'm embarassed to reveal my
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score.
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</li>
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<li><h3>Competition</h3>
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Now in addition to
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<a href="http://www.megidish.net/apple2js/">Gil Megidish's</a>
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Apple2JS, there's a couple of new kids on the block, including
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<a href="http://porkrind.org/a2/">David Caldwell's</a> Apple II+
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emulator where he's put a lot more thought into the graphics rendering
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than I have, and
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<a href="https://github.com/nicholasbs/appletoo">appletoo</a>,
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which I just stumbled across while looking for David's emulator and
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haven't had much time to look at.
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</li>
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</ul>
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<h2>Requirements</h2>
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<ul>
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<li><h3>A Browser with HTML5 Support</h3>
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The most recent versions of
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<a href="http://www.google.com/chrome/" target="_blank">
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Google Chrome</a>,
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<a href="http://www.apple.com/safari/" target="_blank">
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Safari</a>,
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<a href="http://www.firefox.com/" target="_blank" >
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Firefox</a>, and
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<a href="http://www.opera.com/" target="_blank">
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Opera</a>
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all seem to work reasonably well these days, although
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variations in HTML5 support pop up, and occasionally a major release
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will move things around out from under me.
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IE prior to 9 lacks canvas tag support and is unsupported.
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<a href="http://windows.microsoft.com/ie9">IE 9+</a> renders nicely on
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a modern machine.<br/>
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<br />
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In updating this section I realized just how long
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I've been doing this, since I used to have to specify Firefox 3+ and
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Google Chrome 5+, and I'm now running Chrome 23 and Firefox 19.
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</li>
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<li><h3>Basic Knowledge of the Apple ][</h3>
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If you don't know how to use an Apple ][, this won't be much fun for
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you.
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</li>
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</ul>
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<h2>Known Limitations</h2>
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<ul>
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<li><h3>Lame Audio</h3>
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<span class="motter">Apple ][js</span>
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is written entirely using HTML5 and JavaScript, so I've avoiding using
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any Flash audio plugins. Most reputable browsers
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now provide some sort of audio API, but no standard really seems to have
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emerged. I should probably add a volume control.
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</li>
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<li><h3>Poor Printer Support</h3>
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I currently only support sending text characters to a separate window.
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</li>
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</ul>
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<h2>Acknowlegements</h2>
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<ul>
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<li>
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<h3>I'm using the following libraries:</h3>
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<ul>
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<li>
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<a href="http://jquery.com">jQuery</a> and
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<a href="http://jqueryui.com">jQuery UI</a>
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</li>
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<li>
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Base64 Utilities via
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<a href="http://kevin.vanzonneveld.net/">KvZ</a>
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</li>
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<li>
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LED graphics from <a href="http://modernl.com/">Modern Life</a>.
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</li>
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</ul>
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</li>
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<li>
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<h3>I heavily referenced:</h3>
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<ul>
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<li>
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<a href="http://www.scribd.com/doc/200679/Beneath-Apple-DOS-By-Don-Worth-and-Pieter-Lechner">
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<i>Beneath Apple DOS</i>
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</a>
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by Don Worth and Pieter Lechner
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</li>
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<li>
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<i>Inside the Apple //e</i> by Gary B. Little
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</li>
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<li>
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<a href="http://apple2.org.za/gswv/a2zine/GS.WorldView/Resources/DOS.3.3.ANATOMY/">
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<i>DOS 3.3 Anatomy</i>
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</a>
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</li>
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<li>
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<a href="http://www.doc.ic.ac.uk/~ih/doc/stepper/others/example3/diskii_specs.html">
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<i>Apple II Disk Drive Article</i>
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</a>
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by Neil Parker
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</li>
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<li>
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<a href="http://6502.org/">6502.org</a>
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</li>
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<li>
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The
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<a href="http://www.faqs.org/faqs/apple2/programmerfaq/part1/">
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comp.sys.apple2.programmer
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</a>
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FAQ
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</li>
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</ul>
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</li>
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<li>
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<h3>And special thanks to:</h3>
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<ul>
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<li>
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<a href="http://adtpro.sourceforge.net/">ADTPro</a>
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for allowing me to pull some of my circa
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1980 programming efforts off some ancient floppies.
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</li>
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<li>
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<a href="http://kegs.sourceforge.net/">KEGS</a>, because at some
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point I got so tired of futzing with ADC/SBC code I just ported
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the KEGS C code for those opcodes to Javascript so I could stop
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worrying about it.
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</li>
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<li>
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<a href="http://apple2history.org/">Apple II History</a>,
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for a lovely, informative site.
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</li>
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<li>
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<a href="http://www.megidish.net/apple2js/">Gil Megidish</a>,
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for the kick in the pants to finally post my version, once I
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realized there was, in fact, another apple2js in the world.
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</li>
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</ul>
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2016-11-22 05:17:34 +00:00
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</li>
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2013-10-10 18:03:07 +00:00
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<h2>Contact</h2>
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<ul>
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<li>
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<a href="mailto:apple2js@scullinsteel.com">apple2js@scullinsteel.com</a>
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</li>
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</ul>
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</div>
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</body>
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</html>
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