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pdp11-45.html
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<!DOCTYPE html>
<html lang='en'>
<head>
<meta charset="UTF-8">
<title>Javascript PDP 11/45 Emulator</title>
<meta name="description" content="Javascript PDP 11/45 Emulator">
<meta name="keywords" content="PDP,PDP-11,11/45,JavaScript,Emulator">
<style>
:root {
--unitWidth: 4px;
--unitHeight: 5px;
--ledColor: radial-gradient(circle at 2px 1px, #fafa10, #f21600);
--red: #c22020;
--purple: #682468;
}
.frame {
width: calc(var(--unitWidth) * 272);
height: calc(var(--unitHeight) * 93);
position: relative;
background: linear-gradient(#c3bcaa, #a39c8a);
-webkit-text-size-adjust: none;
text-size-adjust: none;
}
.decBase {
width: calc(var(--unitWidth) * 106);
height: calc(var(--unitHeight) * 8);
position: absolute;
top: calc(var(--unitHeight) * 1);
left: calc(var(--unitWidth) * 3);
border: 1px solid #736c62;
border-radius: calc(var(--unitWidth) * 2);
color: #736c62;
font-family: arial, helvetica, sans-serif;
}
.smallSpace {
width: calc(var(--unitWidth) * 2.66);
height: 1px;
float: left;
}
.decLetter {
width: calc(var(--unitWidth) * 4);
height: calc(var(--unitHeight) * 5);
border: 1px solid #736c62;
border-bottom-color: #534c42;
font-weight: 100;
font-size: calc(var(--unitHeight) * 4);
line-height: calc(var(--unitHeight) * 5);
text-align: center;
position: relative;
top: 50%;
transform: translateY(-50%);
float: left;
}
.decName {
position: absolute;
top: 0;
height: 100%;
font-size: calc(var(--unitHeight) * 2);
line-height: calc(var(--unitHeight) * 8);
float: left;
}
.topEdge {
width: calc(var(--unitWidth) * 256);
height: 0;
position: absolute;
top: calc(var(--unitHeight) * 10);
left: 0;
right: 0;
margin: auto;
padding: calc(var(--unitWidth) * 3.33);
background: #837c72;
border: none;
border-radius: calc(var(--unitWidth) * 8);
}
.sideEdges {
width: calc(var(--unitWidth) * 263);
height: 0;
position: absolute;
bottom: 0;
left: 0;
right: 0;
margin: auto;
border-bottom: calc(var(--unitHeight) * 80) solid #9c9781;
border-left: calc(var(--unitWidth) * 2) solid transparent;
border-right: calc(var(--unitWidth) * 2) solid transparent;
}
.switchBevel {
width: calc(var(--unitWidth) * 265);
height: calc(var(--unitHeight) * 1);
background: #a39c8a;
border-top: calc(var(--unitHeight) * 8) solid #9c9781;
border-bottom: calc(var(--unitHeight) * 7) solid #534c42;
position: absolute;
bottom: 0;
left: 0;
right: 0;
margin: auto;
}
.switchPanel {
position: relative;
top: calc(var(--unitHeight) * 12);
left: calc(var(--unitWidth) * 8);
}
.panel {
width: calc(var(--unitWidth) * 256);
height: calc(var(--unitHeight) * 65);
background: #181818;
border-radius: calc(var(--unitWidth) * 4);
color: white;
font-family: arial, helvetica, sans-serif;
font-size: calc(var(--unitHeight) * 1.4);
font-weight: 500;
text-align: center;
}
.floatLeft {
float: left;
}
.floatRight {
float: right;
}
.clear {
clear: both;
}
.blankLine {
width: 100%;
height: calc(var(--unitHeight) * 5);
clear: both;
}
.smallLine {
width: 100%;
height: calc(var(--unitHeight) * 4);
clear: both;
}
.space {
width: calc(var(--unitWidth) * 8);
height: 1px;
float: left;
}
.margin {
margin-right: 1px;
width: calc(100% - 1px);
}
.logo {
width: calc(var(--unitWidth) * 40);
float: left;
}
.statusBlock {
width: calc(var(--unitWidth) * 8);
background-color: black;
font-size: calc(var(--unitHeight) * 1.4);
float: left;
}
.statusLabel1 {
width: 100%;
height: calc(var(--unitHeight) * 2);
line-height: calc(var(--unitHeight) * 3);
}
.statusLabel2 {
width: calc(var(--unitWidth) * 8 - 1px);
height: calc(var(--unitHeight) * 7);
position: relative;
float: left;
}
.ledBlock {
width: calc(var(--unitWidth) * 24);
float: left;
}
.ledBase {
margin-right: 1px;
width: calc(100% - 1px);
height: calc(var(--unitHeight) * 2);
line-height: calc(var(--unitHeight) * 2);
font-size: calc(var(--unitHeight) * 1.5);
position: relative;
float: left;
}
.statusPanel {
width: calc(var(--unitWidth) * 88);
height: calc(var(--unitHeight) * 8);
position: relative;
background: black;
border-radius: calc(var(--unitWidth) * 2);
float: left;
}
.statusTable {
display: table;
table-layout: fixed;
width: 100%;
height: 85%;
position: relative;
top: 15%;
left: 5%;
text-align: left;
float: left;
}
.nick {
height: 0;
width: 0;
border-bottom: calc(var(--unitHeight) * 1.7) solid black;
border-left: calc(var(--unitWidth) * 0.3) solid transparent;
border-right: calc(var(--unitWidth) * 1) solid transparent;
position: absolute;
left: calc(var(--unitWidth) * 7);
bottom: 0;
}
.notch {
height: 0;
width: 1px;
border-top: calc(var(--unitHeight) * 1.9) solid purple;
border-left: calc(var(--unitWidth) * 1.0) solid transparent;
border-right: calc(var(--unitWidth) * 1.0) solid transparent;
position: absolute;
left: calc(var(--unitWidth) * 7);
top: 0;
z-index: 1;
}
.ledPad {
position: relative;
margin-right: 1px;
width: calc(var(--unitWidth) * 8 - 1px);
height: calc(var(--unitHeight) * 10);
background-color: black;
border-bottom-left-radius: calc(var(--unitWidth) * 1.5);
border-bottom-right-radius: calc(var(--unitWidth) * 1.5);
float: left;
}
.mainLed,
.rotaryLed {
width: calc(var(--unitWidth) * 3);
height: calc(var(--unitWidth) * 3);
border-radius: 32%;
background: var(--ledColor);
}
.mainLed {
position: absolute;
bottom: calc(var(--unitWidth) * 2);
left: 0;
right: 0;
margin-left: auto;
margin-right: auto;
}
.rotaryLed {
margin-left: 5%;
margin-right: 10%;
float: left;
}
.lockPanel {
position: relative;
width: calc(var(--unitWidth) * 15);
height: calc(var(--unitHeight) * 12);
font-size: calc(var(--unitHeight) * 1.4);
float: left;
}
.atBottom {
position: absolute;
bottom: 0;
}
.lock {
position: relative;
top: 50%;
transform: translateY(-50%);
margin-left: auto;
margin-right: auto;
width: 55%;
height: 55%;
border-radius: 50%;
background: linear-gradient(15deg, #808080, #383838);
border: solid 1px #707070;
}
.lock::before {
content: "";
display: block;
position: relative;
top: 50%;
transform: translateY(-50%);
margin-left: auto;
margin-right: auto;
width: 45%;
height: 45%;
border-radius: 50%;
background: linear-gradient(15deg, #101010, silver);
border: solid 2px #11100e;
box-shadow: 0 0 0 1px #404040;
}
.key {
content: "";
display: block;
position: absolute;
border: solid 1px #101010;
top: -25%;
left: 46%;
width: 8%;
height: 150%;
background: #b0b0b0;
transform: rotate(-45deg);
transition: 0.5s;
}
.rotaryPanel {
width: calc(var(--unitWidth) * 88);
height: calc(var(--unitHeight) * 12);
position: relative;
background: black;
border-radius: calc(var(--unitWidth) * 3);
float: left;
}
.rotaryTopPanel {
width: calc(var(--unitWidth) * 56);
height: calc(var(--unitHeight) * 25);
position: relative;
background: black;
border-radius: calc(var(--unitWidth) * 3);
float: left;
}
.rotaryBottomPanel {
width: calc(var(--unitWidth) * 56);
height: calc(var(--unitHeight) * 12);
position: relative;
background: black;
border-radius: calc(var(--unitWidth) * 3);
float: left;
}
.rotaryTable {
display: table;
table-layout: fixed;
width: 70%;
height: 85%;
position: absolute;
top: 15%;
left: 5%;
text-align: left;
}
.rotaryTableCell {
display: table-cell;
}
.rotaryTableRow {
display: table-row;
}
.rotaryBase {
position: absolute;
top: 50%;
transform: translateY(-50%);
right: 10%;
}
.rotarySwitch {
height: calc(var(--unitWidth) * 10);
width: calc(var(--unitWidth) * 10);
position: relative;
border: solid 1px #202020;
border-radius: 50%;
background: linear-gradient(
0deg,
#b0b0c0,
#020212 25%,
#404050 35%,
#303040 65%,
#020212 75%,
#b0b0c0
);
transform: rotate(-45deg);
transition: 0.5s;
}
.rotarySwitch:before {
position: absolute;
display: block;
content: "";
width: 50%;
height: 6%;
top: 47%;
background: #faf8f9;
margin: 0 auto;
}
.rotaryCentre {
position: relative;
background: #faf8f9;
left: 43%;
top: 44%;
width: 12%;
height: 12%;
border-radius: 50%;
}
.switchLabels {
position: absolute;
bottom: 0px;
}
.switchPad {
margin: 2px 1px 2px 1px;
width: calc(var(--unitWidth) * 8 - 2px);
height: calc(var(--unitHeight) * 8);
line-height: calc(var(--unitHeight) * 8);
float: left;
}
.switchPadHalf {
width: 100%;
height: 50%;
line-height: calc(var(--unitHeight) * 4);
}
.switchPadBar {
width: 100%;
height: 10%;
background: black;
}
.multiText {
display: inline-block;
vertical-align: middle;
line-height: calc(var(--unitHeight) * 1.5);
}
.switch {
width: calc(var(--unitWidth) * 5);
height: calc(var(--unitHeight) * 1);
border-top: calc(var(--unitHeight) * 8) solid rgba(0, 0, 0, 0.06);
border-bottom: calc(var(--unitHeight) * 7) solid rgba(0, 0, 0, 0.5);
border-left: calc(var(--unitWidth) * 1.5) solid rgba(0, 0, 0, 0.3);
border-right: calc(var(--unitWidth) * 1.5) solid rgba(0, 0, 0, 0.4);
transition: 0.33s;
float: left;
}
.textRight {
text-align: right;
}
.single {
width: calc(var(--unitWidth) * 8);
}
.double {
width: calc(var(--unitWidth) * 16);
}
.triple {
width: calc(var(--unitWidth) * 24 - 1px);
}
.roundTopLeft,
.roundLeft,
.roundTop {
border-top-left-radius: calc(var(--unitWidth) * 1.5);
}
.roundTopRight,
.roundRight,
.roundTop {
border-top-right-radius: calc(var(--unitWidth) * 1.5);
}
.roundBottomLeft,
.roundLeft {
border-bottom-left-radius: calc(var(--unitWidth) * 1.5);
}
.roundBottomRight,
.roundRight {
border-bottom-right-radius: calc(var(--unitWidth) * 1.5);
}
.red {
background-color: var(--red);
}
.purple {
background-color: var(--purple);
}
.black {
background-color: black;
}
.white {
background-color: #f0e6d9;
}
thead {
font-weight: bold;
}
.disk {
font-weight: bold;
}
.system {
white-space: nowrap;
font-weight: bold;
}
pre {
font-family: "Courier New", Courier, "Lucida Console", Monaco, monospace;
font-size: 14px;
}
b {
color: red;
}
</style>
</head>
<body>
<div class=frame>
<div class=decBase>
<span class=smallSpace></span>
<span class=decLetter>d</span>
<span class=decLetter>i</span>
<span class=decLetter>g</span>
<span class=decLetter>i</span>
<span class=decLetter>t</span>
<span class=decLetter>a</span>
<span class=decLetter>l</span>
<span class=smallSpace></span>
<span class=decName>digital equipment corporation • maynard, massachusetts</span>
</div>
<div class=sideEdges></div>
<div class=topEdge></div>
<div class=switchBevel></div>
<div class=switchPanel>
<div class=panel>
<div class=blankLine></div>
<div class=blankLine></div>
<div class=space></div>
<div class=floatLeft>
<div class=clear>
<div class=floatLeft>
<div class=clear>
<span class=ledBlock>
<div class="ledBase red roundTopLeft"></div>
<div class=ledPad>
<div id=a17 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a16 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a15 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase purple"></div>
<div class=ledPad>
<div id=a14 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a13 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a12 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase red"></div>
<div class=ledPad>
<div id=a11 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a10 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a9 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase purple"></div>
<div class=ledPad>
<div id=a8 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a7 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a6 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase red"></div>
<div class=ledPad>
<div id=a5 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a4 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a3 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase purple textRight roundTopRight">ADDRESS </div>
<div class=ledPad>
<div id=a2 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a1 class=mainLed></div>
</div>
<div class=ledPad>
<div id=a0 class=mainLed></div>
</div>
</span>
</div>
<div class=blankLine></div>
<div class=clear>
<div class=lockPanel>
<div class=floatLeft>POWER</div>
<div class=floatRight>LOCK</div>
<div class=lock onclick="if (event && event.shiftKey) { if (--panel.powerSwitch < -1) panel.powerSwitch = 1; } else { if (++panel.powerSwitch > 1) panel.powerSwitch = -1; } if (panel.powerSwitch < 0) { CPU.runState = STATE_HALT; } key.style.transform='rotate('+(panel.powerSwitch * 90 - 45)+'deg)';">
<div id=key class=key></div>
</div>
<div class=atBottom>OFF</div>
</div>
<div class=floatRight>
<span class="ledBlock single">
<div class="ledBase red roundTopLeft"></div>
<div class=ledPad>
<div id=d15 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase purple">
</div>
<div class=ledPad>
<div id=d14 class=mainLed></div>
</div>
<div class=ledPad>
<div id=d13 class=mainLed></div>
</div>
<div class=ledPad>
<div id=d12 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase red">
</div>
<div class=ledPad>
<div id=d11 class=mainLed></div>
</div>
<div class=ledPad>
<div id=d10 class=mainLed></div>
</div>
<div class=ledPad>
<div id=d9 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase purple">
</div>
<div class=ledPad>
<div id=d8 class=mainLed></div>
<div class=notch></div>
</div>
<div class=ledPad>
<div id=d7 class=mainLed></div>
</div>
<div class=ledPad>
<div id=d6 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase red"></div>
<div class=ledPad>
<div id=d5 class=mainLed></div>
</div>
<div class=ledPad>
<div id=d4 class=mainLed></div>
</div>
<div class=ledPad>
<div id=d3 class=mainLed></div>
</div>
</span>
<span class=ledBlock>
<div class="ledBase purple textRight roundTopRight">DATA </div>
<div class=ledPad>
<div id=d2 class=mainLed></div>
</div>
<div class=ledPad>
<div id=d1 class=mainLed></div>
</div>
<div class=ledPad>
<div id=d0 class=mainLed></div>
</div>
</span>
</div>
</div>
<div class=smallLine></div>
<div class=clear>
<span class=logo>
<img src="pdp11-45.svg" alt="pdp11-70" width=100% style="top: 10px;">
</span>
</div>
</div>
<div class=space></div>
<div class=floatLeft>
<div class=rotaryPanel>
<span class=rotaryTable>
<div class=rotaryTableRow>
<div class=rotaryTableCell>
<span class=rotaryLed id=s21></span>USER I
</div>
<div class=rotaryTableCell>
<span class=rotaryLed id=s19></span>SUPER I
</div>
<div class=rotaryTableCell>
<span class=rotaryLed id=s17></span>KERNEL I
</div>
<div class=rotaryTableCell>
<div class=rotaryLed id=s15></div>PROG PHY
</div>
</div>
<div class=rotaryTableRow>
<div class=rotaryTableCell>
<span class=rotaryLed id=s20></span>USER D
</div>
<div class=rotaryTableCell>
<span class=rotaryLed id=s18></span>SUPER D
</div>
<div class=rotaryTableCell>
<span class=rotaryLed id=s16></span>KERNEL D
</div>
<div class=rotaryTableCell>
<div class=rotaryLed id=s14></div>CONS PHY
</div>
</div>
</span>
<span class=rotaryBase>
<div class=rotarySwitch onclick="if (event && event.shiftKey) { if (--panel.rotary0 < 0) panel.rotary0 = 7; } else { if (++panel.rotary0 > 7) panel.rotary0 = 0; } this.style.transform = 'rotate('+(panel.rotary0*45-45)+'deg)'; panel.autoIncr = 0;">
<div class=rotaryCentre></div>
</div>
</span>
</div>
<div class=blankLine></div>
<div class=rotaryPanel>
<span class=rotaryTable>
<div class=rotaryTableRow>
<div class=rotaryTableCell>
<span class=rotaryLed id=s22></span>DATA PATHS
</div>
<div class=rotaryTableCell>
<span class=rotaryLed id=s23></span>µ ADRS FPP/CPU
</div>
</div>
<div class=rotaryTableRow>
<div class=rotaryTableCell>
<span class=rotaryLed id=s24></span>BUS REG
</div>
<div class=rotaryTableCell>
<span class=rotaryLed id=s25></span>DISPLAY REGISTER
</div>
</div>
</span>
<span class=rotaryBase>
<div class=rotarySwitch onclick="if (event && event.shiftKey) { if (--panel.rotary1 < 0) panel.rotary1 = 3; } else { if (++panel.rotary1 > 3) panel.rotary1 = 0; } this.style.transform = 'rotate('+(panel.rotary1*45-45)+'deg)'; panel.autoIncr = 0;">
<div class=rotaryCentre></div>
</div>
</span>
</div>
<div class=blankLine></div>
<div class=statusPanel>
<span class=statusTable>
<div class=rotaryTableRow>
<div class=rotaryTableCell>ADRS ERR</div>
<div class=rotaryTableCell>RUN</div>
<div class=rotaryTableCell>PAUSE</div>
<div class=rotaryTableCell>MASTER</div>
<div class=rotaryTableCell>USER</div>
<div class=rotaryTableCell>SUPER</div>
<div class=rotaryTableCell>KERNEL</div>
<div class=rotaryTableCell>DATA</div>
</div>
<div class=rotaryTableRow>
<div class=rotaryTableCell>
<div id=s10 class=rotaryLed></div>
</div>
<div class=rotaryTableCell>
<div id=s9 class=rotaryLed></div>
</div>
<div class=rotaryTableCell>
<div id=s8 class=rotaryLed></div>
</div>
<div class=rotaryTableCell>
<div id=s7 class=rotaryLed></div>
</div>
<div class=rotaryTableCell>
<div id=s6 class=rotaryLed></div>
</div>
<div class=rotaryTableCell>
<div id=s5 class=rotaryLed></div>
</div>
<div class=rotaryTableCell>
<div id=s4 class=rotaryLed></div>
</div>
<div class=rotaryTableCell>
<div id=s3 class=rotaryLed></div>
</div>
</div>
</span>
</div>
</div>
</div>
<div class=switchLabels>
<span class="switchPad red roundLeft">17</span>
<span class="switchPad red">16</span>
<span class="switchPad red roundRight">15</span>
<span class="switchPad purple roundLeft">14</span>
<span class="switchPad purple">13</span>
<span class="switchPad purple roundRight">12</span>
<span class="switchPad red roundLeft">11</span>
<span class="switchPad red">10</span>
<span class="switchPad red roundRight">9</span>
<span class="switchPad purple roundLeft">8</span>
<span class="switchPad purple">7</span>
<span class="switchPad purple roundRight">6</span>
<span class="switchPad red roundLeft">5</span>
<span class="switchPad red">4</span>
<span class="switchPad red roundRight">3</span>
<span class="switchPad purple roundLeft">2</span>
<span class="switchPad purple">1</span>
<span class="switchPad purple roundRight">0</span>
<span class=space></span>
<span class="switchPad red roundTop"><span class=multiText>LOAD ADRS</span></span>
<span class="switchPad purple roundTop">EXAM</span>
<span class="switchPad red roundTop">CONT</span>
<span class="switchPad purple roundTop">
<div class="switchPadHalf">ENABLE</div>
<div class="switchPadBar"></div>
<div class="switchPadHalf">HALT</div>
</span>
<span class="switchPad red roundTop">
<div class="switchPadHalf">S INST</div>
<div class="switchPadBar"></div>
<div class="switchPadHalf">S BUS</div>
</span>
<span class="switchPad purple roundTop">START</span>
<span class=space></span>
<span class="switchPad red roundTop">DEP</span>
<span class=space></span>
<span class="switchPad purple roundTop"><span class=multiText>REG EXAM</span></span>
<span class="switchPad red roundTop"><span class=multiText>REG DEP</span></span>
</div>
</div>
</div>
<div class=floatLeft>
<span class=space></span>
<span class="switch red" onClick="setSwitch(this, 17);"></span>
<span class="switch red" onClick="setSwitch(this, 16);"></span>
<span class="switch red" onClick="setSwitch(this, 15);"></span>
<span class="switch purple" onClick="setSwitch(this, 14);"></span>
<span class="switch purple" onClick="setSwitch(this, 13);"></span>
<span class="switch purple" onClick="setSwitch(this, 12);"></span>
<span class="switch red" onClick="setSwitch(this, 11);"></span>
<span class="switch red" onClick="setSwitch(this, 10);"></span>
<span class="switch red" onClick="setSwitch(this, 9);"></span>
<span class="switch purple" onClick="setSwitch(this, 8);"></span>
<span class="switch purple" onClick="setSwitch(this, 7);"></span>
<span class="switch purple" onClick="setSwitch(this, 6);"></span>
<span class="switch red" onClick="setSwitch(this, 5);"></span>
<span class="switch red" onClick="setSwitch(this, 4);"></span>
<span class="switch red" onClick="setSwitch(this, 3);"></span>
<span class="switch purple" onClick="setSwitch(this, 2);"></span>
<span class="switch purple" onClick="setSwitch(this, 1);"></span>
<span class="switch purple" onClick="setSwitch(this, 0);"></span>
<span class="switch white" onclick="moveSwitch(this, panel.lampTest = 1 - panel.lampTest); if (!panel.powerSwitch) { if (panel.lamp) panel.lamp = 1; }"></span>
<span class="switch red" onClick="toggleSwitch(this, 0); CPU.displayAddress = CPU.switchRegister; panel.autoIncr = 0;"></span>
<span class="switch purple" onClick="toggleSwitch(this, 0); if (!panel.powerSwitch) { if (CPU.runState == STATE_HALT) examineDeposit(-1); }"></span>
<span class="switch red" onClick="toggleSwitch(this, 0); if (!panel.powerSwitch && CPU.runState == STATE_HALT) { if (panel.halt) { CPU.runState = STATE_STEP; } else { CPU.runState = STATE_RUN; }}"></span>
<span class="switch purple" onClick="moveSwitch(this, panel.halt = 1 - panel.halt); if (!panel.powerSwitch) { if (panel.halt) { CPU.runState = STATE_HALT; }}"></span>
<span class="switch red" onClick="moveSwitch(this, panel.step = 1 - panel.step);"></span>
<span class="switch purple" onclick="toggleSwitch(this, 0); if (!panel.powerSwitch) { if (CPU.runState == STATE_HALT) {iopage.reset(); CPU.registerVal[7] = CPU.displayAddress & 0xffff; if (!panel.halt) { CPU.runState = STATE_RUN; }}}"></span>
<span class="switch white"></span>
<span class="switch red" onClick="toggleSwitch(this, 0); if (!panel.powerSwitch) { if (CPU.runState == STATE_HALT) examineDeposit(CPU.switchRegister); }"></span>
<span class="switch white"></span>
<span class="switch purple" onclick="toggleSwitch(this, 0); if (!panel.powerSwitch) { if (CPU.runState == STATE_HALT) regExamineDeposit(-1); }"></span>
<span class="switch red" onclick="toggleSwitch(this, 0); if (!panel.powerSwitch) { if (CPU.runState == STATE_HALT) regExamineDeposit(CPU.switchRegister); }"></span>
</div>
</div>
</div>
<p class=clear>console<br>
<textarea autofocus id=0 cols=132 rows=24 style="font-family:'Courier New',Courier,'Lucida Console',Monaco,monospace;" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"></textarea>
<br>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(3))">Ctrl/C</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(4))">Ctrl/D</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(8))">Ctrl/H</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(10))">LF</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(17))">Ctrl/Q</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(19))">Ctrl/S</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(20))">Ctrl/T</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(26))">Ctrl/Z</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(27))">ESC</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(9))">TAB</button>
<button onclick="vt52Input(vt52LastUnit,String.fromCharCode(0))">Break</button>
<button onclick="vt52Put(0,10);boot();">REBOOT</button>
</p>
<p>
<label>Paper tape reader file</label>
<select id="ptr">
<option value="">none</option>
<option value="DEC-11-AJPB-PB.ptap">BASIC-11 V007A</option>
<option value="DEC-11-O2PA-PB.ptap">ODT-11X-V004A</option>
<option value="ED-11-V004B-8K.ptap">ED-11-V004B</option>
</select>
</p>
<br>
<div id="vt11"></div>
<br>
<div id="vg11"></div>
<br>
<div id="dl11"></div>
<div id="lp11"></div>
<br>
<h3>PDP 11/45 Emulator</h3>
<p>
This emulator came about because years ago I was a programmer for RSTS/E on a PDP 11/45 and had admired the console idle loop light pattern - but I couldn't quite remember how it looked. Given the unavailability of real systems it became time to write an emulator!
</p>
<p>
I was going to start with a PDP 11/45 emulator but the extra memory of a PDP 11/70 became far too attractive (nearly a whole 4MB!). I eventually wrote a
<a href="pdp11.html">PDP 11/70</a> version as well as a
<a href="pdp11-45.html">PDP 11/45</a> version, and later also a
<a href='../pdp10/pdp10.html'>PDP-10</a>.
</p>
<p>
I met my core objective - I can now see the RSTS/E console light pattern that I was looking for, and found that newer versions (eg v9.6) have a different light pattern. Also I have now seen some of the light patterns for other OSes. RSX and BSD 2.11
have their own different patterns, and Unix V5 and Ultrix operate with absolute minimum light movement (I'm assuming they operate mostly in WAIT mode).
</p>
<p>
Getting all of the operating systems used here presents its own set of challenges - one of which is finding the software in the first place. But one of the most interesting was RSTS/E V06C which has its own
<a href='RSTSv06c.html'>story</a>.
</p>
<p>
Many of the systems also include source in some form or another and it is very interesting to see the different approaches they used. All had a profound influence on systems which evolved later and unix in particular would be familiar to administrators of current systems. I reflect that if I had been exposed to Ultrix earlier I might have chosen a different career path.
<p>
The boot code in this emulator is a custom PDP 11 program running with it's own set of light patterns. It is initially loaded at address 120000 and includes a LIGHTS command which operates by mapping and executing a WAIT instruction from a pattern of virtual addresses. The resulting display simply shows the content of R0 and the address of the instruction being executed. You can also use the BOOT command to start one of the guest operating systems listed below, or the ODT command to start a version of the Octal Debugging Tool.
</p>
<p>
However boot code like this was not part of early PDP 11s. These systems had no BIOS or other software to help get the bare metal started. If you were lucky perhaps the previous boot code would still be intact in non-volatile magnetic core memory, but in general booting the system required toggling in a small bootstrap loader from the front panel.
</p>
<p>
Here is an example of the switch commands for booting from an RK05 where the value at address 1002 selects the unit number (rk0, rk1, rk2, etc). Goodluck!
</p>
<pre>
<b>
Address Data Code Switch commands
</b>
HALT, 001000, LOAD ADDRESS
001000 012737 mov #unit,rkda 012737, DEPOSIT
001002 000000 000000, DEPOSIT or 020000 for rk1, 040000 for rk2, etc
001004 177412 177412, DEPOSIT
001006 012700 mov #rkwc, r0 012700, DEPOSIT
001010 177406 177406, DEPOSIT
001012 012710 mov #-256,(r0) 012710, DEPOSIT
001014 177400 177400, DEPOSIT
001016 012740 mov #5,-(r0) 012740, DEPOSIT
001020 000005 000005, DEPOSIT
001022 105710 tstb (r0) 105710, DEPOSIT
001024 100376 bpl .-2 100376, DEPOSIT
001026 005007 clr pc 005007, DEPOSIT