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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" />
<meta
http-equiv="Content-Security-Policy"
content="script-src 'self' 'unsafe-inline' 'unsafe-eval' *.google-analytics.com *.google.com;"
/>
<title>jsbeeb - Javascript BBC Micro emulator</title>
<link rel="shortcut icon" href="/favicon.ico" />
<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>
</head>
<body>
<nav id="header-bar" class="navbar navbar-dark bg-dark navbar-expand-lg not-electron" role="navigation">
<div class="container-fluid">
<a class="navbar-brand" href="https://bbc.godbolt.org/" target="_top">jsbeeb</a>
<button
class="navbar-toggler"
type="button"
data-bs-toggle="collapse"
data-bs-target="#navbarSupportedContent"
aria-controls="navbarSupportedContent"
aria-expanded="false"
aria-label="Toggle navigation"
>
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav nav mb-2 mb-lg-0">
<li class="nav-item">
<a href="#configuration" class="nav-link" data-bs-toggle="modal" data-bs-target="#configuration">
<span class="bbc-model">BBC B</span></a
>
</li>
<li class="nav-item dropdown embed-hide">
<a
href="#"
class="nav-link dropdown-toggle"
id="navbarDiscs"
role="button"
data-bs-toggle="dropdown"
aria-expanded="false"
>Discs</a
>
<ul class="dropdown-menu dropdown-menu-dark" aria-labelledby="navbarDiscs">
<li>
<a href="#sth" class="dropdown-item sth" data-id="discs" data-bs-toggle="modal" data-bs-target="#sth"
>From STH archive</a
>
</li>
<li>
<a href="#discs" class="dropdown-item" data-bs-toggle="modal" data-bs-target="#discs">
From examples or local</a
>
</li>
<li class="if-drive-available">
<a href="#google-drive" class="dropdown-item" id="open-drive-link">From Google Drive</a>
</li>
<hr />
<li>
<a href="#download-drive" class="dropdown-item" id="download-drive-link">Download drive 0 image</a>
</li>
</ul>
</li>
<li class="nav-item dropdown embed-hide">
<a
href="#"
class="nav-link dropdown-toggle"
id="navbarCassettes"
role="button"
data-bs-toggle="dropdown"
aria-expanded="false"
>Cassettes</a
>
<ul class="dropdown-menu dropdown-menu-dark" id="tape-menu" aria-labelledby="navbarCassettes">
<li>
<a href="#sth" class="dropdown-item sth" data-bs-toggle="modal" data-id="tapes" data-bs-target="#sth"
>From STH archive</a
>
</li>
<li><a data-id="rewind" class="dropdown-item">Rewind cassette</a></li>
<li>
<a href="#discs" class="dropdown-item" data-bs-toggle="modal" data-bs-target="#tapes">
From local file
</a>
</li>
</ul>
</li>
<li class="nav-item dropdown embed-hide">
<a
href="#"
class="nav-link dropdown-toggle"
id="navbarReset"
role="button"
data-bs-toggle="dropdown"
aria-expanded="false"
>Reset</a
>
<ul class="dropdown-menu dropdown-menu-dark" aria-labelledby="navbarReset">
<li><a href="#" id="soft-reset" class="dropdown-item">Soft reset</a></li>
<li><a href="#" id="hard-reset" class="dropdown-item">Hard reset</a></li>
</ul>
</li>
<li class="nav-item dropdown embed-hide">
<a
href="#"
class="nav-link dropdown-toggle"
id="navbarMore"
role="button"
data-bs-toggle="dropdown"
aria-expanded="false"
>More</a
>
<ul class="dropdown-menu dropdown-menu-dark" aria-labelledby="navbarMore">
<li><a href="#" id="fs" class="dropdown-item">Fullscreen</a></li>
<li><a href="#help" class="dropdown-item" data-bs-toggle="modal" data-bs-target="#help">Help</a></li>
<li><a href="mailto:[email protected]" class="dropdown-item">Contact the Author</a></li>
<li>
<a href="http://xania.org/MattGodbolt" class="dropdown-item" rel="author" target="_blank">
About the Author</a
>
</li>
<li>
<a href="#about" class="dropdown-item" data-bs-toggle="modal" data-bs-target="#info" id="about">
About jsbeeb</a
>
</li>
</ul>
</li>
</ul>
<span class="navbar-text m-auto">
Edit BBC BASIC interactively with Owlet at
<a href="https://bbcmic.ro/" target="_blank">bbcmic.ro</a>!
</span>
<form class="d-flex">
<input
id="paste-text"
class="form-control me-2"
type="text"
maxlength="0"
placeholder="Paste text or drop files here..."
aria-label="Search"
/>
</form>
</div>
</div>
</nav>
<div id="audio-warning" class="alert alert-warning initially-hidden">
Your browser has suspended audio -- mouse click or key press for sound.
</div>
<div>
<div id="outer">
<div id="cub-monitor">
<img
id="cub-monitor-pic"
width="896"
height="648"
src="images/cub-monitor.png"
alt="A fake CUB computer monitor"
/>
<div class="sidebar left"><img src="images/placeholder.png" alt="" /></div>
<canvas id="screen" width="896" height="600"></canvas>
<div class="sidebar right"><img src="images/placeholder.png" alt="" /></div>
<div class="sidebar bottom"><img src="images/placeholder.png" alt="" /></div>
</div>
</div>
<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>
<th id="virtual-mhz-header">virtual<br />MHz</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>
<td>
<div class="virtualMHz"></div>
</td>
</tr>
</tbody>
</table>
</div>
<div id="crtc_debug" class="initially-hidden">
<div class="crtc_state">
<h6 class="dbg">6845 state</h6>
<table>
<tbody>
<tr class="template">
<th><span class="register"></span>:</th>
<td class="value"></td>
</tr>
</tbody>
</table>
</div>
<div class="crtc_regs">
<h6 class="dbg">6845 regs</h6>
<table>
<tbody>
<tr class="template">
<th><span class="register"></span>:</th>
<td class="value"></td>
</tr>
</tbody>
</table>
</div>
</div>
<div id="debug" class="initially-hidden">
<div class="debug-container">
<form id="goto-mem-addr-form" role="form">
<div class="input-group input-group-sm">
<span accesskey="m" class="input-group-text" id="mem_addr_text">
<span class="accesskey">M</span>em addr:
</span>
<input
type="text"
class="form-control form-control-sm goto-addr"
placeholder="$0000"
aria-label="Memory address"
aria-describedby="mem_addr_text"
/>
</div>
</form>
<div id="memory">
<div class="template">
<span class="dis_addr">0000</span
><span class="mem_bytes"
><span>11</span> <span>22</span> <span>33</span> <span>44</span> <span>55</span> <span>66</span>
<span>77</span> <span>88</span></span
><span class="mem_asc"
><span>A</span><span>A</span><span>A</span><span>A</span><span>A</span><span>A</span><span>A</span
><span>A</span></span
>
</div>
</div>
</div>
<div class="debug-container">
<form role="form" id="goto-dis-addr-form">
<div class="input-group input-group-sm">
<span accesskey="a" class="input-group-text" id="dis_addr_text"
><span class="accesskey">A</span>ddr:</span
>
<input
type="text"
class="form-control form-control-sm goto-addr"
placeholder="$0000"
aria-label="Disassembly address"
aria-describedby="dis_addr_text"
/>
</div>
</form>
<div id="disassembly">
<div class="template dis_elem">
<span class="bp_gutter"></span><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 class="dbg">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 class="dbg">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" tabindex="-1" aria-labelledby="infoModalLabel" aria-hidden="true">
<div class="modal-dialog modal-lg">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="infoModalLabel">About jsbeeb</h5>
<button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
<div>
By <a href="https://xania.org/">Matt Godbolt</a>. Based on Sarah Walker's
<a href="http://b-em.bbcmicro.com/">b-em</a> emulator. Huge thanks to her for open sourcing her 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.
</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>
I f 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>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="help" tabindex="-1" aria-labelledby="helpModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="helpModalLabel">Help</h5>
<button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
<div>
This is an emulator for the <a href="https://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>
<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 />:</div>
</td>
<td>TODO</td>
<td>TODO</td>
</tr>
<tr>
<td>Debug</td>
<td><span class="key">Ctrl-Home</span></td>
<td>TODO</td>
</tr>
</table>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="discs" tabindex="-1" aria-labelledby="discModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="discModalLabel">Load disc image</h5>
<button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal" aria-label="Close"></button>
</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, DSD, ADF, ADM or ADL 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, DSD, ADF, ADM or ADL file:
<input type="file" id="disc_load" accept=".ssd,.dsd,.adf,.adm,.adl,application/binary" />
</label>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="tapes" tabindex="-1" aria-labelledby="tapeModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="tapeModalLabel">Load cassette image</h5>
<button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
To load a custom cassette 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,application/binary" />
</label>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="google-drive" tabindex="-1" aria-labelledby="google-driveModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="google-driveModalLabel">
Load or create disc from your
<a href="https://drive.google.com/">Google Drive</a>
account
</h5>
<button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
<div class="loading">Loading...</div>
<div>
<ul class="list">
<li class="template">
<a href="#"><span class="name"></span></a>
</li>
</ul>
<div>
<form class="well" role="form" action="#">
<input type="text" placeholder="Create disc..." autofocus class="disc-name" />
<button type="submit" class="btn btn-secondary create-button">Create</button>
</form>
</div>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn" data-bs-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<!-- cannot make this one fade in else our attempts to close the modal while it's still opening fail -->
<div class="modal" id="loading-dialog" tabindex="-1" aria-labelledby="loadingModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-body">
<div class="modal-header">
<h5 class="modal-title loading" id="loadingModalLabel"></h5>
<button
type="button"
class="btn-close btn-close-white"
data-bs-dismiss="modal"
aria-label="Close"
></button>
</div>
</div>
<div class="modal-body">
<div style="display: none" id="google-drive-auth">
Google Drive requires you to authorize jsbeeb to access your files by logging in.<br />
Please click Authorize to open a Google Drive pop-up to authenticate and give permission to jsbeeb.
<form class="well" role="form" action="#">
<button type="submit" class="btn btn-secondary create-button">Authorize</button>
</form>
</div>
</div>
</div>
</div>
</div>
<div class="modal fade" id="sth" tabindex="-1" aria-labelledby="sthModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="sthModalLabel">
Load from
<a href="http://www.stairwaytohell.com/">Stairway to Hell</a>
archive
</h5>
<button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
<div style="margin-bottom: 1rem">
<div class="loading">Loading catalog from STH archive...</div>
<div class="filter">
<label>Filter <input type="text" autofocus id="sth-filter" /></label>
</div>
</div>
<ul id="sth-list">
<li class="template">
<a href="#"><span class="name"></span></a>
</li>
</ul>
</div>
<div class="modal-footer">
<label class="float-xs-left checkbox-inline">
<input type="checkbox" class="autoboot" value="" />Autoboot</label
>
<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="error-dialog" tabindex="-1" aria-labelledby="errorModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="errorModalLabel">An error occurred - sorry!</h5>
</div>
<div class="modal-body">
<div>While <span class="context"></span>:</div>
<div class="error"></div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
<div class="modal fade" id="are-you-sure" tabindex="-1" aria-labelledby="aysModalLabel" aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="aysModalLabel">Are You Sure?</h5>
<button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
<div class="context"></div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary ays-no" data-bs-dismiss="modal">No</button>
<button type="button" class="btn btn-primary ays-yes">Yes</button>
</div>
</div>
</div>
</div>
<div
class="modal fade"
id="configuration"
tabindex="-1"
aria-labelledby="configurationModalLabel"
aria-hidden="true"
>
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="configurationModalLabel">Emulation Configuration</h5>
<button type="button" class="btn-close btn-close-white" data-bs-dismiss="modal" aria-label="Close"></button>
</div>
<div class="modal-body">
<div class="row align-items-center">
<div class="col-sm-6">
<label for="bbc-model-dropdown" class="col-form-label"
>Base model:<br />
<small>(including disk interface)</small>
</label>
</div>
<div class="col-sm-6 dropdown">
<button
type="button"
class="btn btn-secondary dropdown-toggle"
data-bs-toggle="dropdown"
id="bbc-model-dropdown"
>
<span class="bbc-model"></span>
</button>
<ul
class="dropdown-menu dropdown-menu-dark model-menu"
role="menu"
aria-labelledby="bbc-model-dropdown"
>
<li>
<a href="#" class="dropdown-item" data-target="B-DFS1.2">BBC B with DFS 1.2</a>
</li>
<li>
<a href="#" class="dropdown-item" data-target="B-DFS0.9">BBC B with DFS 0.9</a>
</li>
<li>
<a href="#" class="dropdown-item" data-target="B1770">BBC B with ADFS</a>
</li>
<li>
<a href="#" class="dropdown-item" data-target="Master">BBC Master 128 (DFS)</a>
</li>
<li>
<a href="#" class="dropdown-item" data-target="MasterADFS">BBC Master 128 (ADFS)</a>
</li>
</ul>
</div>
</div>
<div class="row align-items-center">
<div class="col-sm-6">
<label for="keyboardDropdown" class="col-form-label">Keyboard layout:</label>
</div>
<div class="col-sm-6 dropdown">
<button
type="button"
class="btn btn-secondary dropdown-toggle"
data-bs-toggle="dropdown"
id="keyboardDropdown"
>
<span class="keyboard-layout">Physical</span>
</button>
<ul
class="dropdown-menu dropdown-menu-dark keyboard-menu"
role="menu"
aria-labelledby="keyboardDropdown"
>
<li>
<a href="#" class="dropdown-item" data-target="physical">Physical: '*' is next to Enter/Return</a>
</li>
<li>
<a href="#" class="dropdown-item" data-target="natural">Natural: '*' is shift-8</a>
</li>
<li>
<a href="#" class="dropdown-item" data-target="gaming">Gaming: handy for games like Zalaga</a>
</li>
</ul>
</div>
</div>
<div class="align-items-center">
<div class="row">
<div class="col-sm-6">
<label for="bbc-peripherals" class="col-form-label"
>Additional peripherals:<br /><small
>(some combinations may cause compatibility issues)</small
></label
>
</div>
<div class="col-sm-6">
<div class="form-check">
<input class="form-check-input" type="checkbox" id="65c02" name="65c02" />
<label class="form-check-label" for="65c02">65c02 co-processor</label>
</div>
<div class="form-check">
<input class="form-check-input" type="checkbox" id="hasMusic5000" name="hasMusic5000" />
<label class="form-check-label" for="hasMusic5000">Music 5000 synthesiser</label>
</div>
<div class="form-check">
<input class="form-check-input" type="checkbox" id="hasTeletextAdaptor" name="hasTeletextAdaptor" />
<label class="form-check-label" for="hasTeletextAdaptor">Teletext adaptor</label>
</div>
</div>
</div>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Close</button>
</div>
</div>
</div>
</div>
</body>
</html>