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LMC0.3.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="keywords" content="LMC, Little Man Computer, CPU, Simulator, Simulation, Emulator, Emulation, Central, Processor, Processing, Unit, ALU, MAR, MDR, CU">
<meta name="description" content="Little Man Computer (LMC) Simulator">
<meta name="author" content="Mark Gamble">
<title>Little Man Computer</title>
<!-- A simulator for the Little Man Computer assembler language -->
<!-- Written in HTML, JavaScript and CSS. -->
<!-- I am indebted to Oli Folkerd for Tabulator: -->
<!-- http://tabulator.info -->
<!-- I am also indebted to James Hall of parallax for jsPDF: -->
<!-- https://parall.ax/products/jspdf -->
<link rel="stylesheet" href="LMCstyle0.3.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/tabulator/5.1.8/css/tabulator_midnight.min.css">
<link rel="icon" type="image/x-icon" href="favicon.ico">
<script src="LMCmill0.3.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tabulator/5.1.8/js/tabulator.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.4.0/jspdf.umd.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jspdf-autotable/3.5.20/jspdf.plugin.autotable.min.js"></script>
<script src="https://kit.fontawesome.com/0b212d21ae.js" crossorigin="anonymous"></script>
<script src="https://cdn.auth0.com/js/auth0-spa-js/2.0/auth0-spa-js.production.js"></script>
</head>
<!-- This was really helpful: -->
<!-- https://www.w3docs.com/snippets/html/how-to-make-a-div-fill- -->
<!-- the-height-of-the-remaining-space.html -->
<body onresize="resizeEvent()" onload="filltable()">
<!-- Should also create a symbol table -->
<div id="div-main" class="box">
<!-- Row 1 -->
<div class="row header" id="div-hdr" style="display:flex; flex-direction:row; margin-top:-4px; margin-bottom: -4px; margin-left:10px; margin-right:10px; flex-wrap: nowrap; justify-content: flex-start; align-items: center;">
<p>Little Man Computer Simulation</p>
<div style="margin-left: auto;">
<button id="save-btn" class="icon-button" title="Save program to file" onclick="saveCode()"><i class="fa-solid fa-file-arrow-down fa-lg"></i></button>
<button id="hide-load-btn" class="icon-button" title="Load program from file" onclick="document.getElementById('load-btn').click()"><i class="fa-solid fa-file-arrow-up fa-lg"></i></button>
<button id="print-btn" class="icon-button" title="Print program to PDF" onclick="printCode()"><i class="fa-solid fa-print fa-lg"></i></button>
<button id="about-modal-btn" class="icon-button" title="About"><i class="fa-solid fa-circle-info fa-lg"></i></button>
<button id="settings-modal-btn" class="icon-button" title="Settings"><i class="fa-solid fa-gear fa-lg"></i></button>
</div>
</div>
<!-- Row 2 -->
<div class="row content" id="div-content" style="display:flex; flex-direction:row; margin:0px; margin-right:10px; width:100%;">
<div class="resize-drag" id="codetableholder" style="display:flex; flex-direction:column; min-width:300px; width:350px; max-width:700px; margin:0px; max-height:85vh;">
<div class="row content" id="code-table" style="flex: 0 1 auto;" ></div>
<div class="footer" id="code-table-buttons" class="footer" style="bottom:0; display:flex; gap:20px; align-items: center; flex: 1;">
<input id="load-btn" type="file" style="display:none;">
<button id="assemble-button" class="button" onclick="assembleCode()">Assemble</button>
<button id="clear-button" onclick="clearCode()" class="button">Clear</button>
</div>
</div>
<div id="rpanrResize" class="resize-drag" > </div>
<div class="col" id="processor-memory-holder" style="display:flex; flex-direction:column; margin:0px; width:100%;">
<div class="row content" id="processor-memory-row" style="flex: 0 1 auto;">
<div class="col-6" id="processor-schematic" ><canvas id="processor-canvas">Your browser does not support the HTML5 canvas</canvas></div>
<div class="col-6" id="memory-table"></div>
</div>
<div class="row" id="cpu-button-holder">
<div class="footer" style="display:flex; gap:20px; flex-wrap: nowrap; justify-content: flex-start; align-items: center;">
<button id="run-btn" class="button" onclick="runCode()">Run</button>
<button id="stop-btn" class="button" onclick="allStop()">Stop</button>
<button id="resume-btn" class="button" onclick="allAhead()">Resume</button>
<button id="next-btn" class="button" onclick="stepCode()">Next</button>
<p id="state-label" style="margin:0px;">Ready</p>
</div>
</div>
<div class="row footer" id="I-O-Console-holder" style="display:flex; flex-direction:row; flex: 0 1 auto; margin:0px; width:100%; height:100%;">
<div style="display:flex; flex-direction:column; margin:0px;">
<div id="input-div" style="background-color: #ee99ee;padding:8px; align-items: center;"><p style="margin:0px"><span style="background-color: #ee99ee; color: #000000; padding: 8px;">Input:</span><input id="input-text" minlength="1" maxlength="16" ><button onclick="processInput()" id="input-button">Enter</button></div>
<div class="col-12" id="output-div" style="flex: 1; background-color: #ee99ee;padding:8px;"><p style="margin:0px;"><span style="background-color: #ee99ee; color: #000000; padding: 8px;">Output:</span><textarea id="output-text" rows="12" readonly="true"></textarea></div>
</div>
<div id="log-div" style="background-color: #ffbbff;padding:8px;display:flex; flex-direction:column; width:100%;">
<div style="margin:0px; height:100%; width:100%; box-sizing: border-box;">
<span style="background-color: #ffbbff; color: #000000; padding: 8px;">Console:</span>
<textarea id="log-text" rows="4" readonly="true" style="height:90%;"></textarea>
</div>
</div>
</div>
</div>
</div>
</div>
<!-- Settings modal -->
<div class="modal" id="settings-modal" role="dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<i class="fa-solid fa-gear fa-2x" style="margin: 8px 8px;"></i>
<button class="icon-button" id="settings-close-btn" style="float: right;"onclick="cancelSettings()"><i class="fa-solid fa-circle-xmark fa-2x"></i></button>
<h4 class="modal-title" style="margin-left: 8px;">LMC Simulation Settings</h4>
</div>
<div class="modal-body">
<input type="checkbox" name="showDataFlows" value="1" checked id="setting-show-data-flows" style="margin:8px;">
<label for="showDataFlows">Show data flows around the CPU during program execution</label><br>
<input type="checkbox" name="showVariableValuesInCode" value="1" checked id="setting-show-variable-values" style="margin:8px;">
<label for="showDataFlows">Show variable values in the code table during program execution</label><br>
<input type="checkbox" name="showMemoryAccess" value="1" checked id="setting-show-memory-access" style="margin:8px;">
<label for="showMemoryAccess">Show memory read/write locations during program execution</label><br><br>
<input type="range" name="executionSpeed" id="setting-speed" min="0" max="4" step="1" value="2" onchange="changeSetting('speed')">
<label for="setting-speed">Execution Speed</label><br><br>
<input type="checkbox" name="switchToCAIE" value="0" id="setting-switch-to-caie" style="margin:8px;">
<label for="switchToCAIE">Switch to the CAIE pseudo-assembler language</label><br>
<p id="speed-display"><i class="fa-regular fa-hand"></i>Run at Medium speed - about 0.5 seconds per cycle</p>
</div>
<div class="modal-footer">
<button id="settings-cancel-btn" class="button" onclick="cancelSettings()">Cancel</button>
<button id="settings-save-btn" class="button" onclick="saveSettings()">Save</button>
</div>
</div>
</div>
</div>
<!-- Examples modal -->
<div class="modal" id="examples-modal" role="dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<i class="fa-solid fa-file-code fa-2x" style="margin: 8px 8px;"></i>
<button class="icon-button" id="examples-close-btn" style="float: right;"><i class="fa-solid fa-circle-xmark fa-2x"></i></button>
<h4 class="modal-title" style="margin-left: 8px;">LMC Example Programs</h4>
</div>
<div class="modal-body">
<p>Select an example to load:</p>
<div>
<input type="radio" id="example1" name="example_select" value=1 checked>
<label for="example1">Example 1 - Add two numbers together</label>
</div>
<div>
<input type="radio" id="example2" name="example_select" value=2>
<label for="example2">Example 2 - Output a pattern of 1s and 0s</label>
</div>
<div>
<input type="radio" id="example3" name="example_select" value=3>
<label for="example3">Example 3 - Calculate the square of a number</label>
</div>
<div>
<input type="radio" id="example4" name="example_select" value=4>
<label for="example4">Example 4 - Integer division</label>
</div>
</div>
<div class="modal-footer" style="margin-top:20px;">
<button id="examples-close-btn" class="button" onclick="closeExamples()">Cancel</button>
<button id="examples-load-btn" class="button" onclick="loadExample()">Load</button>
</div>
</div>
</div>
</div>
<!-- Help modal -->
<div class="modal" id="help-modal" role="dialog">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<i class="fa-solid fa-pen-to-square fa-2x" style="margin: 8px 8px;"></i>
<button class="icon-button" id="help-close-btn" style="float: right;"><i class="fa-solid fa-circle-xmark fa-2x"></i></button>
<h4 class="modal-title" style="margin-left: 8px;">LMC Editor Help</h4>
</div>
<div class="modal-body">
<p>
The Code Editor is based on a grid system, with columns for you to enter
labels, operators and operands.
The left-most column is used to show which line of code is being executed when the program
is running, and the 'Line' column shows non-editable line numbers.
</p>
<p>
You can move between lines and columns by pressing the Tab key, or by using the cursor keys.
</p>
<p>
Ctrl-Z and Ctrl-Y will undo and redo the last edit, but only if you are not editing a cell in the Code Editor.
</p>
<p>
Select a line by left-clicking anywhere on the line. The line will be highlighted.
</p>
<p>
You can delete the current line using the Del or Delete key - all of the subsequent lines will be moved up.
</p>
<p>
Pressing the Ins or Insert key will create a new line above the current line, moving all subsequent lines down.
</p>
<p>
When you are happy with your code, press the Assemble button, and the LMC Simulator will check and
assemble your code into memory. If there are any errors, a message will appear in the Console window
indicating the line and problem.
</p>
<p>
The Load button can be used to load pre-written programs from your computer.
</p>
<p>
The Save button will save a text file on your computer containing the current program.
</p>
<p>
The Print button will create and download a PDF version of the current program.
</p>
</div>
<div class="modal-footer">
<button id="help-close-btn" class="button" onclick="closeHelp()">Close</button>
</div>
</div>
</div>
</div>
<!-- About modal -->
<div class="modal" id="about-modal">
<div class="modal-content">
<div class="header">
<i class="fa-solid fa-circle-info fa-2x" style="margin: 8px 8px;"></i>
<button class="icon-button" id="about-close-btn" style="float: right;"><i class="fa-solid fa-circle-xmark fa-2x"></i></button>
<h4 class="modal-title" style="margin-left: 8px;">About the Little Man Computer</h4>
</div>
<div>
<h3>An Introduction to the LMC</h3>
<p>
The Little Man Computer (LMC) is a simplified model of a computer, based on the von Neumann architecture.
</p>
<h3>The LMC Simulator</h3>
<p>
This web app provides a simulation of the LMC, so that you can write programs in the LMC assembler
and then assemble and run the programs. The simulator will show you the state of all of the main
registers in the CPU, as well as the state of the 'memory' of the LMC.
</p>
<p>
The flow of data around the CPU is displayed, and you can pause and resume the execution of your
program at any time.
</p>
<p>
The code editor has individual columns for labels, operators and operands. To learn more about how the editor
works, just press the 'Help' button below the code window.
You can use Ctrl-Z to undo any editor actions.
</p>
<p>
There are a number of example programs that you can try out - just press the 'Examples' button
below for more information.
</p>
</div>
<div class="modal-footer">
<button id="rabout-close-btn" class="button" onclick="closeAbout()">Close</button>
<button id="instruction-set-modal-btn" class="button">Instruction Set</button>
<button id="examples-modal-btn" class="button">Examples</button>
<button id="help-modal-btn" class="button">Editor Help</button>
</div>
</div>
</div>
<!-- Instruction Set modal -->
<div class="modal" id="instruction-set-modal">
<div class="modal-content">
<div class="header">
<i class="fa-solid fa-table-list fa-2x" style="margin: 8px 8px;"></i>
<button class="icon-button" id="instruction-set-close-btn" style="float: right;"><i class="fa-solid fa-circle-xmark fa-2x"></i></button>
<h4 class="modal-title" style="margin-left: 8px;">Little Man Computer Instruction Set</h4>
</div>
<div>
<table id="instruction-set-table">
<tr>
<th>Instruction</th>
<th>Mnemonic</th>
<th>Machine Code</th>
<th>Explanation</th>
</tr>
<tr>
<td>Load Accumulator</td>
<td>LDA</td>
<td>5xx</td>
<td>Load the contents of the given memory address (xx) into the Accumulator</td>
</tr>
<tr>
<td>Store Accumulator</td>
<td>STA</td>
<td>3xx</td>
<td>Store the contents of the Accumulator at the given memory address (xx)</td>
</tr>
<tr>
<td>Add</td>
<td>ADD</td>
<td>1xx</td>
<td>Add the contents of the given memory address (xx) to the value in the Accumulator</td>
</tr>
<tr>
<td>Subtract</td>
<td>SUB</td>
<td>2xx</td>
<td>Subtract the contents of the given memory address (xx) from the value in the Accumulator</td>
</tr>
<tr>
<td>Input</td>
<td>INP</td>
<td>901</td>
<td>Copy the value from the Input 'mailbox' into the Accumulator</td>
</tr>
<tr>
<td>Output</td>
<td>OUT</td>
<td>902</td>
<td>Copy the value from the Accumulator into the Output 'mailbox'</td>
</tr>
<tr>
<td>Branch</td>
<td>BRA</td>
<td>6xx</td>
<td>Branch (jump) to the instruction at the given memory address (xx)</td>
</tr>
<tr>
<td>Branch if positive</td>
<td>BRP</td>
<td>8xx</td>
<td>If the value in the Accumulator is positive (including zero), then branch to the instruction at the given memory address (xx)</td>
</tr>
<tr>
<td>Branch if zero</td>
<td>BRZ</td>
<td>7xx</td>
<td>If the value in the Accumulator is zero, then branch to the instruction at the given memory address (xx)</td>
</tr>
<tr>
<td>Halt</td>
<td>HLT</td>
<td>000</td>
<td>Stop execution of the program</td>
</tr>
<tr>
<td>Data</td>
<td>DAT</td>
<td>value of the data</td>
<td>Indicates that the current memory address holds a data value</td>
</tr>
</table>
</div>
<div class="modal-footer">
<button id="rinstruction-set-close-btn" class="button">Close</button>
</div>
</div>
</div>
<script>
let settingsModalBtn = document.getElementById("settings-modal-btn");
let settingsModal = document.getElementById("settings-modal");
let settingsCloseBtn = document.getElementById("settings-close-btn");
settingsModalBtn.onclick = function(){
settingsModal.style.display = "block";
stashOldSettings();
}
settingsCloseBtn.onclick = function(){
settingsModal.style.display = "none";
}
window.onclick = function(e){
if(e.target == settingsModal){
settingsModal.style.display = "none";
} else if(e.target == aboutModal){
aboutModal.style.display = "none";
}
}
let examplesModalBtn = document.getElementById("examples-modal-btn");
let examplesModal = document.getElementById("examples-modal");
let examplesCloseBtn = document.getElementById("examples-close-btn");
examplesModalBtn.onclick = function(){
aboutModal.style.display = "none";
examplesModal.style.display = "block";
}
examplesCloseBtn.onclick = function(){
examplesModal.style.display = "none";
}
window.onclick = function(e){
if(e.target == settingsModal){
settingsModal.style.display = "none";
} else if(e.target == aboutModal){
aboutModal.style.display = "none";
} else if(e.target == examplesModal){
examplesModal.style.display = "none";
}
}
let instructionSetModalBtn = document.getElementById("instruction-set-modal-btn");
let instructionSetModal = document.getElementById("instruction-set-modal");
let instructionSetCloseBtn = document.getElementById("instruction-set-close-btn");
let instructionSetRCloseBtn = document.getElementById("rinstruction-set-close-btn");
instructionSetModalBtn.onclick = function(){
aboutModal.style.display = "none";
instructionSetModal.style.display = "block";
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instructionSetCloseBtn.onclick = function(){
instructionSetModal.style.display = "none";
}
instructionSetRCloseBtn.onclick = function(){
instructionSetModal.style.display = "none";
}
//
// Foundation work for clickable processor schematic
// Hook the mouse event (should do touch too) and convert
// window coordinates to canvas coordinates
// Call canvasHitCheck() in the pile of JavaScript
// to figure out what they have clicked on
//
document.getElementById('processor-canvas').onclick=function(e){
let rect = document.getElementById('processor-canvas').getBoundingClientRect();
canvasHitCheck(e.clientX - rect.left, e.clientY - rect.top);
}
let aboutModalBtn = document.getElementById("about-modal-btn");
let aboutModal = document.getElementById("about-modal");
let aboutCloseBtn = document.getElementById("about-close-btn");
aboutModalBtn.onclick = function(){
aboutModal.style.display = "block";
}
aboutCloseBtn.onclick = function(){
aboutModal.style.display = "none";
}
let helpModalBtn = document.getElementById("help-modal-btn");
let helpModal = document.getElementById("help-modal");
let helpCloseBtn = document.getElementById("help-close-btn");
helpModalBtn.onclick = function(){
aboutModal.style.display = "none";
helpModal.style.display = "block";
}
helpCloseBtn.onclick = function(){
helpModal.style.display = "none";
}
<!-- Handle return being pressed in the Input box -->
document.getElementById('input-text').onkeypress=function(e){
if (e.keyCode==13){
document.getElementById('input-button').click();
}
}
<!-- also temp and doesn't seem to work! -->
let canvasElement = document.getElementById("processor-schematic")
canvasElement.addEventListener("resize", debouncedResize );
function debouncedResize() {
console.log("Event fired");
}
<!-- Temp - alternative to split.js -->
// Should probably handle touchstart === mousedown and
// touchmove === mousemove and
// touchend === mouseup
//
let ismdwn = 0
rpanrResize.addEventListener('mousedown', mD);
function mD(event) {
ismdwn = 1
document.body.addEventListener('mousemove', mV);
document.body.addEventListener('mouseup', end);
document.body.style.cursor = "col-resize";
// Prevent the code table from altering the cursor
// May want to do this for other elements, but the
// code table is very close to the drag control, so
// it is the most likely to be 'hit'
let codeTableElement = document.getElementById("code-table");
let codeTableHolderElement = document.getElementById("codetableholder");
codeTableElement.style.pointerEvents="none";
codeTableHolderElement.style.pointerEvents="none";
// Prevent the mouse down and drag being interpreted on other elements
// This stops bits of text in the tables and buttons from being
// highlighted if we happen to drag over them.
event.preventDefault();
}
function mV(event) {
if (ismdwn === 1) {
codetableholder.style.flexBasis = event.clientX + "px";
// Prevent the mouse down and drag being interpreted on other elements
// Needs to be done here as well as in the mouse down event.
event.preventDefault();
} else {
end();
}
}
const end = (e) => {
ismdwn = 0;
document.body.style.cursor = "default";
document.body.removeEventListener('mouseup', end);
rpanrResize.removeEventListener('mousemove', mV);
// Allow the code table to alter the cursor again
let codeTableElement = document.getElementById("code-table");
let codeTableHolderElement = document.getElementById("codetableholder");
codeTableElement.style.pointerEvents="auto";
codeTableHolderElement.style.pointerEvents="auto";
// Resize the CPU schematic and memory table.
resizeEvent();
}
<!-- Temp - alternative to split.js -->
</script>
</body>
</html>