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<!DOCTYPE HTML>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="author" content="Matt Godbolt">
<meta name="description" content="A Javascript BBC Micro emulator">
<title>JSBeeb - Javascript BBC Micro emulator</title>
<link rel="stylesheet" href="lib/bootstrap.min.css" type="text/css">
<link rel="stylesheet" href="jsbeeb.css" type="text/css">
<link rel="shortcut icon" href="/favicon.ico">
<script type="text/javascript" src="lib/require.js"></script>
<script type="text/javascript">
require(['requirejs-common'], function() {
require(['main']);
});
</script>
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-55180-8', 'godbolt.org');
ga('send', 'pageview');
</script>
<script type="text/javascript">
(function() {
var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
po.src = 'https://apis.google.com/js/plusone.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
})();
</script>
</head>
<body>
<div class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">jsbeeb - a Javascript BBC micro emulator</a>
</div>
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="dropdown btn-group">
<button type="button" href="#" class="btn btn-default navbar-btn dropdown-toggle" data-toggle="dropdown"><span id="bbc-model">BBC B</span><span class="caret"></span></button>
<ul class="dropdown-menu" role="menu" id="model-menu">
<li><a href="#" data-target="B">BBC B</a></li>
<li><a href="#" data-target="Master">BBC Master 128</a></li>
</ul>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Discs<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="#sth" class="sth" data-id="discs" data-toggle="modal" data-target="#sth">From STH archive</a></li>
<li class="hidden-unless-db-enabled"><a href="#dropbox" data-toggle="modal"
data-target="#dropbox">From Dropbox</a></li>
<li><a href="#discs" data-toggle="modal" data-target="#discs">From examples or local</a>
</li>
</ul>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Tapes<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="#sth" class="sth" data-toggle="modal" data-id="tapes" data-target="#sth">From STH archive</a></li>
<li><a href="#discs" data-toggle="modal" data-target="#tapes">From local file</a>
</li>
</ul>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Share<b class="caret"></b></a>
<ul class="dropdown-menu">
<li class="social">
<g:plusone annotation="inline" width="150"></g:plusone>
</li>
<li class="social"><a href="https://twitter.com/share" class="twitter-share-button"
data-via="mattgodbolt">Tweet</a>
<script>!function (d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (!d.getElementById(id)) {
js = d.createElement(s);
js.id = id;
js.src = "//platform.twitter.com/widgets.js";
fjs.parentNode.insertBefore(js, fjs);
}
}(document, "script", "twitter-wjs");</script>
</li>
</ul>
</li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown">Contact<b class="caret"></b></a>
<ul class="dropdown-menu">
<li><a href="https://plus.google.com/105166465490735292917" rel="author">About Matt</a></li>
<li><a href="mailto:matt@godbolt.org">Contact Matt</a></li>
</ul>
</li>
<li><a href="#help" data-toggle="modal" data-target="#help">Help</a></li>
<li><a href="#about" data-toggle="modal" data-target="#info">About</a></li>
</ul>
</div>
<!--/.nav-collapse -->
</div>
</div>
<div class="container">
<canvas id="screen" width="699" height="567"></canvas>
<div id="leds">
<table>
<thead>
<tr>
<th>cassette<br>motor</th>
<th>caps<br>lock</th>
<th>shift<br>lock</th>
<th>drive<br>0/2</th>
<th>drive<br>1/3</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<div class="red led" id="motorlight"></div>
</td>
<td>
<div class="red led" id="capslight"></div>
</td>
<td>
<div class="red led" id="shiftlight"></div>
</td>
<td>
<div class="yellow led" id="drive0"></div>
</td>
<td>
<div class="yellow led" id="drive1"></div>
</td>
</tr>
</tbody>
</table>
</div>
<div id="debug" class="initially-hidden">
<div class="debug-container">
<form class="form-inline" role="form" id="goto-mem-addr-form">
<div class="form-group">
<label accesskey="m" class="control-label"><span class="accesskey">M</span>em
addr:</label>
<input type="text" class="form-control input-sm goto-addr" placeholder="$0000">
</div>
</form>
<div id="memory">
<div class="template"><span class="dis_addr">0000</span><span class="mem_bytes">11 22 33 44 55 66 77 88</span><span
class="mem_asc">ABCDEFG</span></div>
</div>
</div>
<div class="debug-container">
<form class="form-inline" role="form" id="goto-dis-addr-form">
<div class="form-group">
<label accesskey="a" class="control-label"><span class="accesskey">A</span>ddr:</label>
<input type="text" class="form-control input-sm goto-addr" placeholder="$0000">
</div>
</form>
<div id="disassembly">
<div class="template"><span class="dis_addr">0000</span><span
class="instr_bytes">11 22 33</span><span class="instr_asc">ABC</span><span
class="disassembly">LDA (&70), X</span></div>
</div>
</div>
<div id="registers">
<div>
<span class="flag" id="cpu6502_flag_c">C</span><span class="flag" id="cpu6502_flag_z">Z</span><span
class="flag" id="cpu6502_flag_i">I</span><span class="flag" id="cpu6502_flag_d">D</span><span
class="flag" id="cpu6502_flag_v">V</span><span class="flag" id="cpu6502_flag_n">N</span>
</div>
<div><span class="register">A</span>: <span id="cpu6502_a">00</span></div>
<div><span class="register">X</span>: <span id="cpu6502_x">00</span></div>
<div><span class="register">Y</span>: <span id="cpu6502_y">00</span></div>
<div><span class="register">S</span>: <span id="cpu6502_s">00</span></div>
<div><span class="register">PC</span>: <span id="cpu6502_pc">0000</span></div>
</div>
</div>
<div id="hardware_debug" class="initially-hidden">
<div class="via_regs" id="sysvia">
<h6>System VIA</h6>
<table>
<tbody>
<tr class="template">
<th><span class="register"></span>:</th>
<td class="value"></td>
</tr>
</tbody>
</table>
</div>
<div class="via_regs" id="uservia">
<h6>User VIA</h6>
<table>
<tbody>
<tr class="template">
<th><span class="register"></span>:</th>
<td class="value"></td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="modal fade" id="info">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">About jsbeeb</h4>
</div>
<div class="modal-body">
<div>By <a href="http://xania.org/">Matt Godbolt</a>. Based on Tom Walker's <a
href="http://b-em.bbcmicro.com/">b-em</a> emulator. Huge thanks to him for open sourcing his
code. Big thanks too to Richard Talbot-Watkins for his help and support. The disc loaded up by
default is the amazing Elite (thanks to <a href="http://www.iancgbell.clara.net/elite/bbc/">Ian
Bell</a> for making it available).
</div>
<div>Source is on <a href="https://github.com/mattgodbolt/jsbeeb">GitHub</a>. Works best in Chrome
or Firefox. Still very much work in progress: keep coming back for bugfixes and more features!
</div>
<div>Cycle-accurate emulation greatly helped by the fantastic <a href="http://www.visual6502.org/">Visual
6502</a> Project. Consider donating to them if you enjoy this stuff as much as I do!
</div>
<div>If you're looking for more information on the BBC or to find like-minded people to chat about
the hardware or software, check out the <a href="http://www.stardot.org.uk/forums/">StarDot
forums</a>.
</div>
</div>
<!-- model-body -->
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
<div class="modal fade" id="help">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Help</h4>
</div>
<div class="modal-body">
<div>This is an emulator for the <a href="http://en.wikipedia.org/wiki/Bbc_micro">BBC Micro</a>
Model B, a popular home computer in the UK in the 1980s.
</div>
<div>The default disc image is Elite - a pioneering 3D space trading game. To boot discs on the BBC,
one would press <span class="key">SHIFT</span> and <span class="key">BREAK</span>. The keyboard
of the BBC is slightly different from a modern PC, notably in the placement of the symbol
characters. Also, the current keyboard layout is optimized for a US keyboard; I am working on
improving this situation.
</div>
<h5>Handy key mappings</h5>
<table class="keymap">
<tr>
<th>BBC</th>
<th>PC</th>
<th>OSX</th>
</tr>
<tr>
<td><span class="function key">F0</span></td>
<td><span class="key">F10</span></td>
<td><span class="key">F10</span></td>
</tr>
<tr>
<td><span class="key">BREAK</span></td>
<td><span class="key">F12</span></td>
<td><span class="key">Right ⌘</span> + <span class="key">F12</span></td>
</tr>
<tr>
<td><span class="key">COPY</span></td>
<td><span class="key">End</span></td>
<td><span class="key">Right ⌘</span> + <span class="key">F11</span></td>
</tr>
<tr>
<td>
<div class="dbl key">*<br>:</span>
</td>
<td>TODO</td>
<td>TODO</td>
</tr>
<tr>
<td>Debug</td>
<td><span class="key">Home</span></td>
<td>TODO</td>
</tr>
</table>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
<div class="modal fade" id="discs">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Load disc image</h4>
</div>
<div class="modal-body">
<ul id="disc-list">
<li class="template"><a href="#"><span class="name"></span></a> - <span
class="description"></span></li>
</ul>
To load a custom disc image, get an SSD file and load it below. Search the web, or check somewhere
like <a href="http://www.bbcmicrogames.com/GettingStarted.html">here</a> for these. Be aware the
images are usually stored in a ZIP file, and you'll need to unzip first.
<div class="disc">
<label>Load local SSD file: <input type="file" id="disc_load"
accept=".ssd,image/*"></input></label>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
<div class="modal fade" id="tapes">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Load tape image</h4>
</div>
<div class="modal-body">
To load a custom tape image, get a UEF file and load it below.
<div class="tape">
<label>Load local UEF file: <input type="file" id="tape_load"
accept=".uef,image/*"></input></label>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
<div class="modal fade" id="dropbox">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Load or create disc from your <a href="https://www.dropbox.com/">Dropbox</a>
account</h4>
<div class="loading">Loading...</div>
</div>
<div class="modal-body">
<ul id="dropbox-list">
<li class="template"><a href="#"><span class="name"></span></a></li>
</ul>
<div>
<form class="form-horizontal well" role="form" action="#">
<input type="text" placeholder="Create disc..." autofocus id="db-disc-name">
<button type="submit" class="btn btn-default create-button">Create</button>
</form>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn" data-dismiss="modal">Close</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
<div class="modal fade" id="loading-dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-body">
<h4 class="modal-title loading"></h4>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
<div class="modal fade" id="sth">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Load from <a href="http://www.stairwaytohell.com/">Stairway to Hell</a>
archive</h4>
<div class="loading">Loading catalog from STH archive...</div>
<div class="filter">
<input type="text" placeholder="Filter..." autofocus id="sth-filter">
</div>
</div>
<div class="modal-body">
<ul id="sth-list">
<li class="template"><a href="#"><span class="name"></span></a></li>
</ul>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
<div class="modal fade" id="error-dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">An error occurred - sorry!</h4>
<div>While <span class="context"></span>:</div>
<div class="error"></div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
<div class="modal fade" id="are-you-sure">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal" aria-hidden="true">×</button>
<h4 class="modal-title">Are you sure?</h4>
<div class="context"></div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default ays-no" data-dismiss="modal">No</button>
<button type="button" class="btn ays-yes">Yes</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
</body>
</html>