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index.html
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<!doctype html>
<html lang="en-us">
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>m4</title>
<style>
body {background-color: #fff; margin: 0px;}
#top {
background-color: #fff;
padding: 25px;
}
#title {
font-family: sans-serif;
font-size: 24px;
margin-bottom: 25px;
}
#description {
width: 900px;
}
#app {background-color: #000; padding: 25px;}
.emscripten { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
textarea.emscripten { font-family: monospace; width: 80%; }
div.emscripten { text-align: center; }
div.emscripten_border { border: 1px solid black; }
/* the canvas *must not* have any border or padding, or mouse coords will be wrong */
canvas.emscripten { border: 0px none; background-color: black; }
.spinner {
height: 50px;
width: 50px;
margin: 0px auto;
-webkit-animation: rotation .8s linear infinite;
-moz-animation: rotation .8s linear infinite;
-o-animation: rotation .8s linear infinite;
animation: rotation 0.8s linear infinite;
border-left: 10px solid rgb(0,150,240);
border-right: 10px solid rgb(0,150,240);
border-bottom: 10px solid rgb(0,150,240);
border-top: 10px solid rgb(100,0,200);
border-radius: 100%;
background-color: rgb(200,100,250);
}
@-webkit-keyframes rotation {
from {-webkit-transform: rotate(0deg);}
to {-webkit-transform: rotate(360deg);}
}
@-moz-keyframes rotation {
from {-moz-transform: rotate(0deg);}
to {-moz-transform: rotate(360deg);}
}
@-o-keyframes rotation {
from {-o-transform: rotate(0deg);}
to {-o-transform: rotate(360deg);}
}
@keyframes rotation {
from {transform: rotate(0deg);}
to {transform: rotate(360deg);}
}
</style>
</head>
<body>
<div id="app">
<figure style="overflow:visible;" id="spinner"></figure>
<div class="emscripten" id="status">Downloading...</div>
<div class="emscripten">
<progress value="0" max="100" id="progress" hidden=1></progress>
</div>
<canvas class="emscripten" id="canvas" oncontextmenu="event.preventDefault()"></canvas>
</div>
<div id="top">
<div id="title">MicaSOFT Electronics & Microelectronics Tutor</div>
<div id="description">
Here's an interesting DOS program from 1992. This is the last of four programs from MicaSOFT that cover basic electronics and computing - starting with the atom and ending with a section on software.<br>
The first three programs are quite buggy but this is the most interesting one. Unfortunately a couple of the topics in this one are broken and will crash on certain pages.<br><br>
As well as the lovely diagrams and animations, there are some fun historical oddities:
<ul><li>The forthcoming <a href="https://en.wikipedia.org/wiki/P5_(microarchitecture)">"80586"</a> and <a href="https://web.archive.org/web/20190330163341/https://plus.google.com/108984290462000253857/posts/GavXzpHPKGw">65832</a> processors
<li>Photonic computing is mentioned a couple of times. Apparently it's the next great leap forward, and might be "nearer than the pessimists predict"
<li>A 16-bit encoding called Unicode could become the international standard, but a 32-bit encoding would be "excessive"
</ul>
I can't find any information about MicaSOFT, but according to an advert in PC Mag, these tutors originally cost $199 for a single user, and came on four 5.25" disks (or if you preferred, two 3.5" diskettes).<br><br>
The program is running inside <a href="https://github.com/dreamlayers/em-dosbox">an Emscripten port</a> of DOSBox.
</div>
</div>
<script type='text/javascript'>
var statusElement = document.getElementById('status');
var progressElement = document.getElementById('progress');
var spinnerElement = document.getElementById('spinner');
var Module = {
preRun: [],
postRun: [],
print: (function() {
var element = document.getElementById('output');
if (element) element.value = ''; // clear browser cache
return function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
// These replacements are necessary if you render to raw HTML
//text = text.replace(/&/g, "&");
//text = text.replace(/</g, "<");
//text = text.replace(/>/g, ">");
//text = text.replace('\n', '<br>', 'g');
console.log(text);
if (element) {
element.value += text + "\n";
element.scrollTop = element.scrollHeight; // focus on bottom
}
};
})(),
printErr: function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
if (0) { // XXX disabled for safety typeof dump == 'function') {
dump(text + '\n'); // fast, straight to the real console
} else {
console.error(text);
}
},
canvas: (function() {
var canvas = document.getElementById('canvas');
// As a default initial behavior, pop up an alert when webgl context is lost. To make your
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canvas.addEventListener("webglcontextlost", function(e) { alert('WebGL context lost. You will need to reload the page.'); e.preventDefault(); }, false);
return canvas;
})(),
setStatus: function(text) {
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if (m && now - Module.setStatus.last.time < 30) return; // if this is a progress update, skip it if too soon
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Module.setStatus.last.text = text;
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text = m[1];
progressElement.value = parseInt(m[2])*100;
progressElement.max = parseInt(m[4])*100;
progressElement.hidden = false;
spinnerElement.hidden = false;
} else {
progressElement.value = null;
progressElement.max = null;
progressElement.hidden = true;
if (!text) spinnerElement.hidden = true;
}
statusElement.innerHTML = text;
},
totalDependencies: 0,
monitorRunDependencies: function(left) {
this.totalDependencies = Math.max(this.totalDependencies, left);
Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
}
};
Module.setStatus('Downloading...');
window.onerror = function() {
Module.setStatus('Exception thrown, see JavaScript console');
spinnerElement.style.display = 'none';
Module.setStatus = function(text) {
if (text) Module.printErr('[post-exception status] ' + text);
};
};
</script>
<script type="text/javascript">
var Module = typeof Module !== 'undefined' ? Module : {};
if (!Module.expectedDataFileDownloads) {
Module.expectedDataFileDownloads = 0;
Module.finishedDataFileDownloads = 0;
}
Module.expectedDataFileDownloads++;
(function() {
var loadPackage = function(metadata) {
var PACKAGE_PATH;
if (typeof window === 'object') {
PACKAGE_PATH = window['encodeURIComponent'](window.location.pathname.toString().substring(0, window.location.pathname.toString().lastIndexOf('/')) + '/');
} else if (typeof location !== 'undefined') {
// worker
PACKAGE_PATH = encodeURIComponent(location.pathname.toString().substring(0, location.pathname.toString().lastIndexOf('/')) + '/');
} else {
throw 'using preloaded data can only be done on a web page or in a web worker';
}
var PACKAGE_NAME = '/home/kyle/dostutor/em-dosbox/src/m4.data';
var REMOTE_PACKAGE_BASE = 'm4.data';
if (typeof Module['locateFilePackage'] === 'function' && !Module['locateFile']) {
Module['locateFile'] = Module['locateFilePackage'];
err('warning: you defined Module.locateFilePackage, that has been renamed to Module.locateFile (using your locateFilePackage for now)');
}
var REMOTE_PACKAGE_NAME = Module['locateFile'] ? Module['locateFile'](REMOTE_PACKAGE_BASE, '') : REMOTE_PACKAGE_BASE;
var REMOTE_PACKAGE_SIZE = metadata.remote_package_size;
var PACKAGE_UUID = metadata.package_uuid;
function fetchRemotePackage(packageName, packageSize, callback, errback) {
var xhr = new XMLHttpRequest();
xhr.open('GET', packageName, true);
xhr.responseType = 'arraybuffer';
xhr.onprogress = function(event) {
var url = packageName;
var size = packageSize;
if (event.total) size = event.total;
if (event.loaded) {
if (!xhr.addedTotal) {
xhr.addedTotal = true;
if (!Module.dataFileDownloads) Module.dataFileDownloads = {};
Module.dataFileDownloads[url] = {
loaded: event.loaded,
total: size
};
} else {
Module.dataFileDownloads[url].loaded = event.loaded;
}
var total = 0;
var loaded = 0;
var num = 0;
for (var download in Module.dataFileDownloads) {
var data = Module.dataFileDownloads[download];
total += data.total;
loaded += data.loaded;
num++;
}
total = Math.ceil(total * Module.expectedDataFileDownloads/num);
if (Module['setStatus']) Module['setStatus']('Downloading data... (' + loaded + '/' + total + ')');
} else if (!Module.dataFileDownloads) {
if (Module['setStatus']) Module['setStatus']('Downloading data...');
}
};
xhr.onerror = function(event) {
throw new Error("NetworkError for: " + packageName);
}
xhr.onload = function(event) {
if (xhr.status == 200 || xhr.status == 304 || xhr.status == 206 || (xhr.status == 0 && xhr.response)) { // file URLs can return 0
var packageData = xhr.response;
callback(packageData);
} else {
throw new Error(xhr.statusText + " : " + xhr.responseURL);
}
};
xhr.send(null);
};
function handleError(error) {
console.error('package error:', error);
};
var fetchedCallback = null;
var fetched = Module['getPreloadedPackage'] ? Module['getPreloadedPackage'](REMOTE_PACKAGE_NAME, REMOTE_PACKAGE_SIZE) : null;
if (!fetched) fetchRemotePackage(REMOTE_PACKAGE_NAME, REMOTE_PACKAGE_SIZE, function(data) {
if (fetchedCallback) {
fetchedCallback(data);
fetchedCallback = null;
} else {
fetched = data;
}
}, handleError);
function runWithFS() {
function assert(check, msg) {
if (!check) throw msg + new Error().stack;
}
function DataRequest(start, end, audio) {
this.start = start;
this.end = end;
this.audio = audio;
}
DataRequest.prototype = {
requests: {},
open: function(mode, name) {
this.name = name;
this.requests[name] = this;
Module['addRunDependency']('fp ' + this.name);
},
send: function() {},
onload: function() {
var byteArray = this.byteArray.subarray(this.start, this.end);
this.finish(byteArray);
},
finish: function(byteArray) {
var that = this;
Module['FS_createDataFile'](this.name, null, byteArray, true, true, true); // canOwn this data in the filesystem, it is a slide into the heap that will never change
Module['removeRunDependency']('fp ' + that.name);
this.requests[this.name] = null;
}
};
var files = metadata.files;
for (var i = 0; i < files.length; ++i) {
new DataRequest(files[i].start, files[i].end, files[i].audio).open('GET', files[i].filename);
}
function processPackageData(arrayBuffer) {
Module.finishedDataFileDownloads++;
assert(arrayBuffer, 'Loading data file failed.');
assert(arrayBuffer instanceof ArrayBuffer, 'bad input to processPackageData');
var byteArray = new Uint8Array(arrayBuffer);
var curr;
// Reuse the bytearray from the XHR as the source for file reads.
DataRequest.prototype.byteArray = byteArray;
var files = metadata.files;
for (var i = 0; i < files.length; ++i) {
DataRequest.prototype.requests[files[i].filename].onload();
}
Module['removeRunDependency']('datafile_/home/kyle/dostutor/em-dosbox/src/m4.data');
};
Module['addRunDependency']('datafile_/home/kyle/dostutor/em-dosbox/src/m4.data');
if (!Module.preloadResults) Module.preloadResults = {};
Module.preloadResults[PACKAGE_NAME] = {fromCache: false};
if (fetched) {
processPackageData(fetched);
fetched = null;
} else {
fetchedCallback = processPackageData;
}
}
if (Module['calledRun']) {
runWithFS();
} else {
if (!Module['preRun']) Module['preRun'] = [];
Module["preRun"].push(runWithFS); // FS is not initialized yet, wait for it
}
}
loadPackage({"files": [{"start": 0, "audio": 0, "end": 24, "filename": "/run.bat"}, {"start": 24, "audio": 0, "end": 56, "filename": "/dosbox.conf"}, {"start": 56, "audio": 0, "end": 347214, "filename": "/m4.exe"}], "remote_package_size": 347214, "package_uuid": "24a76852-b23e-465a-a90b-2d4a4f56af48"});
})();
Module['arguments'] = [ './run.bat' ];
</script>
<script>
var ASSERTIONS = 0;
// Copyright 2017 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
// Prefix of data URIs emitted by SINGLE_FILE and related options.
var dataURIPrefix = 'data:application/octet-stream;base64,';
// Indicates whether filename is a base64 data URI.
function isDataURI(filename) {
return String.prototype.startsWith ?
filename.startsWith(dataURIPrefix) :
filename.indexOf(dataURIPrefix) === 0;
}
// Copied from https://github.com/strophe/strophejs/blob/e06d027/src/polyfills.js#L149
// This code was written by Tyler Akins and has been placed in the
// public domain. It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com
/**
* Decodes a base64 string.
* @param {String} input The string to decode.
*/
var decodeBase64 = typeof atob === 'function' ? atob : function (input) {
var keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
var output = '';
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '');
do {
enc1 = keyStr.indexOf(input.charAt(i++));
enc2 = keyStr.indexOf(input.charAt(i++));
enc3 = keyStr.indexOf(input.charAt(i++));
enc4 = keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 !== 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 !== 64) {
output = output + String.fromCharCode(chr3);
}
} while (i < input.length);
return output;
};
// Converts a string of base64 into a byte array.
// Throws error on invalid input.
function intArrayFromBase64(s) {
if (typeof ENVIRONMENT_IS_NODE === 'boolean' && ENVIRONMENT_IS_NODE) {
var buf;
try {
buf = Buffer.from(s, 'base64');
} catch (_) {
buf = new Buffer(s, 'base64');
}
return new Uint8Array(buf.buffer, buf.byteOffset, buf.byteLength);
}
try {
var decoded = decodeBase64(s);
var bytes = new Uint8Array(decoded.length);
for (var i = 0 ; i < decoded.length ; ++i) {
bytes[i] = decoded.charCodeAt(i);
}
return bytes;
} catch (_) {
throw new Error('Converting base64 string to bytes failed.');
}
}
// If filename is a base64 data URI, parses and returns data (Buffer on node,
// Uint8Array otherwise). If filename is not a base64 data URI, returns undefined.
function tryParseAsDataURI(filename) {
if (!isDataURI(filename)) {
return;
}
return intArrayFromBase64(filename.slice(dataURIPrefix.length));
}
// Copyright 2017 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
/** @type {function(string, boolean=, number=)} */
function intArrayFromString(stringy, dontAddNull, length) {
var len = length > 0 ? length : lengthBytesUTF8(stringy)+1;
var u8array = new Array(len);
var numBytesWritten = stringToUTF8Array(stringy, u8array, 0, u8array.length);
if (dontAddNull) u8array.length = numBytesWritten;
return u8array;
}
function intArrayToString(array) {
var ret = [];
for (var i = 0; i < array.length; i++) {
var chr = array[i];
if (chr > 0xFF) {
if (ASSERTIONS) {
assert(false, 'Character code ' + chr + ' (' + String.fromCharCode(chr) + ') at offset ' + i + ' not in 0x00-0xFF.');
}
chr &= 0xFF;
}
ret.push(String.fromCharCode(chr));
}
return ret.join('');
}
var memoryInitializer = 'dosbox.html.mem';
memoryInitializer = Module['locateFile'] ? Module['locateFile'](memoryInitializer, '') : memoryInitializer;
Module['memoryInitializerRequestURL'] = memoryInitializer;
var meminitXHR = Module['memoryInitializerRequest'] = new XMLHttpRequest();
meminitXHR.open('GET', memoryInitializer, true);
meminitXHR.responseType = 'arraybuffer';
meminitXHR.send(null);
var script = document.createElement('script');
script.src = "dosbox.js";
document.body.appendChild(script);
</script>
</body>
</html>