From 708869815db37b34d15d255df543fe4ae29dc027 Mon Sep 17 00:00:00 2001
From: Jeff Parsons <jeff@pcjs.org>
Date: Tue, 22 Nov 2016 16:54:45 -0800
Subject: [PATCH] Fixed DL11 for RT-11, and added more message capabilities

---
 docs/pcx86/examples/pcx86-dbg.js | 14 +++----
 docs/pcx86/examples/pcx86.js     | 12 +++---
 modules/pdp11/lib/bus.js         | 18 ++++-----
 modules/pdp11/lib/cpustate.js    | 28 ++++++++++++--
 modules/pdp11/lib/defines.js     |  8 ++--
 modules/pdp11/lib/device.js      |  2 +-
 modules/pdp11/lib/messages.js    | 48 +++++++++++++++---------
 modules/pdp11/lib/pc11.js        |  2 +-
 modules/pdp11/lib/rk11.js        | 17 ++++++---
 modules/pdp11/lib/rl11.js        |  2 +-
 modules/pdp11/lib/serialport.js  | 63 +++++++++++++++++---------------
 modules/shared/lib/keys.js       |  8 ++--
 12 files changed, 135 insertions(+), 87 deletions(-)

diff --git a/docs/pcx86/examples/pcx86-dbg.js b/docs/pcx86/examples/pcx86-dbg.js
index 7755492b7..cd3b3f3d8 100644
--- a/docs/pcx86/examples/pcx86-dbg.js
+++ b/docs/pcx86/examples/pcx86-dbg.js
@@ -44,8 +44,8 @@
  http://pcjs.org/modules/shared/lib/save.js (C) Jeff Parsons 2012-2016
 */
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 function Wk(a,b,c){var d=a.V[b];d||(d={Fc:[0,0],$c:[0,0],Ab:[0,0],Be:[0,0]});c=c&&13<=c.length?c:il;d.Fc[0]=c[0][0];d.Fc[1]=c[0][1];d.$c[0]=c[1][0];d.$c[1]=c[1][1];d.Ab[0]=c[2][0];d.Ab[1]=c[2][1];d.Be[0]=c[3][0];d.Be[1]=c[3][1];d.gh=c[4];d.mode=c[5];d.jg=c[6];d.Ed=c[7];d.md=c[8];d.td=c[9];d.af=c[10];d.De=c[11];d.vd=c[12];d.Yb=c[13]||0;d.ef=c[14]||!1;a.V[b]=d}
 function Fk(a,b,c){for(var d="",e=a.qa[c],f=1;8>=f;f++){var g="pcjs-bitCell";f||(g+=" pcjs-bitCellLeft");d+='<div id="'+(c+"-"+f)+'" class="'+g+'" data-value="0">'+f+"</div>\n"}e.innerHTML=d;jl(a,b,c,!0)}function kl(a,b,c){if(b=(a=Ek[a.ja|0])&&a[b])for(var d in b)if(a=b[d],a.Lc&1<<c)return a;return null}
 function Yk(a,b,c){for(var d=null,e=Ek[a.ja]||Ek[a.ja|0]||Ek[5150],f=0;f<e.length;f++){var g=e[f];if(g&&(g=g[b])){a=a.C[f][c?0:1]&g.Lc;for(var h in g.gd)if(g.gd[h]==a&&(d=h,"number"==typeof+d))break;break}}return d}function $k(a,b){if(b<+Yk(a,zk,void 0)){if(!a.ia)return 1;if(b<a.ia.length)switch(a.ia[b]){case 160:case 180:case 320:case 360:return 1;case 720:return 3;case 1200:return 2;case 1440:return 4}}return 0}function Xk(a,b){return+Yk(a,5,b)+ +Yk(a,6,b)}
@@ -628,7 +628,7 @@ function jp(a){var b,c,d={},e;if(a.C&&a.C.length)for(b=a.A,c=0;c<b.length;c++)fo
 112,d.Mf++,f=!0;else for(c=446,b=0;4>b;b++){if(128==cp(a,e,c+0,1)){d.cg=cp(a,e,c+8,4);(e=bp(a,d.cg))&&(f=!0);break}c+=16}if(!f)return}d.Jf||(d.Jf=cp(a,e,19,2)||cp(a,e,32,4),d.If=cp(a,e,14,2),d.th=d.If+cp(a,e,22,2)*cp(a,e,16,1),d.Dh=cp(a,e,17,2),d.Mf=cp(a,e,13,1));d.rh=d.th+((32*d.Dh+(d.Va-1))/d.Va|0);d.$m=(d.Jf-d.rh)/d.Mf|0;d.Gg=4084>=d.$m?12:16;d.Gl=12==d.Gg?4086:65526;b=[];for(e=d.th;e<d.rh;e++)b.push(d.cg+e);mp(a,d,a.Ug,"",b);for(b=0;b<a.C.length;b++){d=a.C[b];for(e=c=0;e<d.xe.length;e++){var f=
 d.xe[e],g=c,h=a.ub*a.lb,k=f%h,m=k/a.lb|0,k=k%a.lb,n=void 0,t=void 0,q=void 0;(n=a.A[f/h|0])&&(t=n[m])&&(q=t[k])&&!q.file&&(q.file=d,q.fn=g);c+=a.Va}e=d;if((ma(e.kc,".EXE")||ma(e.kc,".DLL")||ma(e.kc,".DRV"))&&23117==dp(e,Po)&&64==dp(e,Qo)&&(c=dp(e,Ro),17742==dp(e,So,c))){m=dp(e,Vo,c);g=dp(e,Xo,c);h=dp(e,$o,c);if(g&&m){d=e;f=g+c;g=m;h=h||0;m=1;d.yd=[];for(d.A=[];g--;){if(k=ap(d,f)<<h)n=ap(d,f+2)||65536,d.yd[m++]={oi:k,Ik:k+n-1,we:[]};f+=8}d.yd[254]={oi:0,Ik:0,we:[]}}g=dp(e,To,c);h=dp(e,Uo,c);if(g&&
 h)for(d=e,f=g+=c,g+=h,h=1;f<g;){k=ap(d,f);m=k&255;if(!m)break;k>>=8;f+=2;if(k)for(;m--;)ap(d,f,1),254>=k?(n=k,t=ap(d,f+1),f+=3):(n=ap(d,f+3,1),t=ap(d,f+4),f+=6),d.yd[n]&&(d.yd[n].we[h]=[t]),d.A[h]=[n,t],h++;else h+=m}(g=dp(e,Yo,c))&&ep(e,g+c);g=dp(e,Zo,c);h=dp(e,Wo,c);g&&h&&ep(e,g,g+h)}}}}
-function mp(a,b,c,d,e){var f,g=a.C.length,h=b.Va/32|0;b.Mo=d+"\\";for(var k=0;k<e.length;k++)for(var m=e[k],n=0;n<h;n++){var t=a,q=b;f=n;q.te&&q.ri&&q.ri==m||(q.ri=m,q.te=bp(t,q.ri));if(q.te){f*=32;var A=cp(t,q.te,f,1);if(A){if(229==A)q.kc=null;else{q.kc=qa(np(t,q.te,f+0,8));A=qa(np(t,q.te,f+8,3));A.length&&(q.kc+="."+A);q.dh=cp(t,q.te,f+11,1);q.gj=cp(t,q.te,f+28,2);q.Fl=cp(t,q.te,f+26,2);f=q;var A=[],F=q.Fl;if(F){do{if(2>F)break;for(var C=q.rh+(F-2)*q.Mf,D=0;D<q.Mf;D++)A.push(q.cg+C++);F=lp(t,q,
+function mp(a,b,c,d,e){var f,g=a.C.length,h=b.Va/32|0;b.No=d+"\\";for(var k=0;k<e.length;k++)for(var m=e[k],n=0;n<h;n++){var t=a,q=b;f=n;q.te&&q.ri&&q.ri==m||(q.ri=m,q.te=bp(t,q.ri));if(q.te){f*=32;var A=cp(t,q.te,f,1);if(A){if(229==A)q.kc=null;else{q.kc=qa(np(t,q.te,f+0,8));A=qa(np(t,q.te,f+8,3));A.length&&(q.kc+="."+A);q.dh=cp(t,q.te,f+11,1);q.gj=cp(t,q.te,f+28,2);q.Fl=cp(t,q.te,f+26,2);f=q;var A=[],F=q.Fl;if(F){do{if(2>F)break;for(var C=q.rh+(F-2)*q.Mf,D=0;D<q.Mf;D++)A.push(q.cg+C++);F=lp(t,q,
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 function bp(a,b){var c=a.ub*a.lb,d=b/c|0;return d<a.Bb?(b%=c,a.seek(d,b/a.lb|0,b%a.lb+1)):null}function cp(a,b,c,d){for(var e=0,f=0;d--;){var g=a.read(b,c++);if(0>g)break;e|=g<<f;f+=8}return e}function np(a,b,c,d){for(var e="";d--;){var f=a.read(b,c++);if(0>=f)break;e+=String.fromCharCode(f)}return e}function gp(a,b,c,d,e,f){a||(a={sector:d,length:e,data:[],pattern:f});a.Hl=b;a.Il=c;a.ud=a.Zc=0;a.Wa=!1;return a}
 function hp(a,b){b="action=open&volume="+b+("&mode="+a.mode);b+="&chs="+a.Bb+":"+a.ub+":"+a.lb+":"+a.Va;b+="&machine="+a.controller.gf();b+="&user="+a.controller.ie();return Ba()+"/api/v1/disk?"+b}
@@ -644,7 +644,7 @@ l.restore=function(a){var b=0,c="unsupported restore format";if(a&&0<a.length){v
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 l.toJSON=function(){var a;a=0;for(var b;b=bp(this,a++);)up(b);a=JSON.stringify(this.A,function(a,b){if("file"!=a)return b});a=a.replace(/,"length":512/gm,"").replace(/,"pattern":0/gm,"");a=a.replace(/"(sector|length|data|pattern)":/gm,"$1:");a=a.replace(/,"[^"]*":([0-9]+|true|false)/gm,"");a=a.replace(/(sector|length|data|pattern):/gm,'"$1":');return a=a.replace(/([\]}]),/gm,"$1,\n")};
 function up(a){var b=a.data,c=b.length;if(c<<2==a.length){for(var d=c-1,e=b[d],f=0;d--&&b[d]===e;)f++;f++&&(b.length=c-f,a.pattern=e)}}function vp(a){bb.call(this,"FDC",a,vp,524288);this.dmaRead=this.el;this.dmaWrite=this.fl;this.dmaFormat=this.vl;this.U=a.autoMount||null;this.fa=a.sortBy||"name";"none"==this.fa&&(this.fa=null);this.B=[];this.ia=!La("Mobi")&&window&&"FileReader"in window}jb(vp);aa={};
-var wp={3:{Ud:3,ge:0,name:aa.Fo},4:{Ud:2,ge:1,name:aa.Do},5:{Ud:9,ge:7,name:aa.Jo},6:{Ud:9,ge:7,name:aa.zo},7:{Ud:2,ge:0,name:aa.Bo},8:{Ud:1,ge:2,name:aa.Eo},10:{Ud:2,ge:7,name:aa.Ao},13:{Ud:6,ge:7,name:aa.wo},15:{Ud:3,ge:0,name:aa.Co}};l=vp.prototype;
+var wp={3:{Ud:3,ge:0,name:aa.Go},4:{Ud:2,ge:1,name:aa.Eo},5:{Ud:9,ge:7,name:aa.Ko},6:{Ud:9,ge:7,name:aa.Ao},7:{Ud:2,ge:0,name:aa.Co},8:{Ud:1,ge:2,name:aa.Fo},10:{Ud:2,ge:7,name:aa.Bo},13:{Ud:6,ge:7,name:aa.xo},15:{Ud:3,ge:0,name:aa.Do}};l=vp.prototype;
 l.Pb=function(a,b,c){var d=this;switch(b){case "listDisks":this.qa[b]=c;if(this.fa){b=[];for(a=0;a<c.options.length;a++)b.push(c.options[a]);b.sort(function(a,b){return"path"!=d.fa?a.text.localeCompare(b.text):a.value.localeCompare(b.value)});for(a=0;a<b.length;a++)try{c.options[a]=b[a]}catch(e){break}}c.onchange=function(){var a=d.qa.descDisk,b=c.options[c.selectedIndex];if(a&&b){var g={};if(b=b.getAttribute("data-value"))try{g=eval("("+b+")")}catch(h){w("FDC option error: "+h.message)}b=g.desc;
 void 0===b&&(b="");g=g.href;void 0!==g&&(b='<a href="'+g+'" target="_blank">'+b+"</a>");a.innerHTML=b}};return!0;case "descDisk":case "listDrives":return this.qa[b]=c,c.onchange=function(){var a=ea(c.value,10);null!=a&&xp(d,a)},!0;case "loadDrive":return this.qa[b]=c,c.onclick=function(){var a=d.qa.listDisks;a&&yp(d,a.options[a.selectedIndex].text,a.value)},!0;case "saveDrive":if(!this.ia){c.parentNode.removeChild(c);break}this.qa[b]=c;c.onclick=function(){var a=d.qa.listDrives;a&&a.options&&d.A&&
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diff --git a/docs/pcx86/examples/pcx86.js b/docs/pcx86/examples/pcx86.js
index 3f25fa2a7..480290af4 100644
--- a/docs/pcx86/examples/pcx86.js
+++ b/docs/pcx86/examples/pcx86.js
@@ -44,8 +44,8 @@
  http://pcjs.org/modules/shared/lib/save.js (C) Jeff Parsons 2012-2016
 */
 var l,ba,ca={163840:[40,1,8,,254],184320:[40,1,9,,252],327680:[40,2,8,,255],368640:[40,2,9,,253],737280:[80,2,9,,249],1228800:[80,2,15,,249],1474560:[80,2,18,,240],2949120:[80,2,36,,240],21368320:[615,4,17],2494464:[203,2,12,512],5242880:[256,2,40,256],10485760:[512,2,40,256]},n={Tm:1,Sj:3,Um:26," ":32,"!":33,'"':34,"#":35,$:36,"%":37,"&":38,"'":39,"(":40,")":41,"*":42,"+":43,",":44,"-":45,".":46,"/":47,0:48,1:49,2:50,3:51,4:52,5:53,6:54,7:55,8:56,9:57,":":58,";":59,"<":60,"=":61,">":62,"?":63,"@":64,
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 function ha(a){var b="",c=a.lastIndexOf(".");0<=c&&(b=a.substr(c+1).toLowerCase());return b}function ia(a,b){return-1!==a.indexOf(b,a.length-b.length)}var ja={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#039;"};function ka(a){return a.replace(/[&<>"']/g,function(a){return ja[a]})}function la(a){return String.prototype.trim?a.trim():a.replace(/^\s+|\s+$/g,"")}
@@ -81,7 +81,7 @@ function sb(a,b,c,d,e){a.G.font=a.P;a.G.fillStyle=a.qa;a.G.fillText(b,a.D,a.K);a
 function ub(a,b,c){Ka.call(this,"Bus",a,ub);this.A=b;this.Ia=c;this.D=a.busWidth||20;this.L=Math.pow(2,this.D);this.ba=this.Fa=this.L-1|0;this.da=32==this.D||20>=this.D?12:24>=this.D?14:15;this.xb=1<<this.da;this.ia=this.xb>>2;this.B=this.xb-1;this.H=this.L/this.xb|0;this.C=this.H-1;this.I=[];this.K=[];this.S=[];this.P=[];a=new u;vb(a,this.Ia);this.R=Array(this.H);for(b=0;b<this.H;b++)this.R[b]=a;a=this.A;b=this.R;c=this.da;a.vc=a.R=b;a.da=c;a.xb=1<<a.da;a.pb=a.xb-1;a.pf=b.length;a.$d=a.pf-1;a=this.A;
 a.Fa=a.oc=this.Fa;t(this)}Ta(ub);ub.prototype.reset=function(){wb(this,!0)};ub.prototype.Ub=function(a,b){b||this.reset();return!0};
 function xb(a,b,c,d,e){for(var f=b,g=c,h=f>>>a.da;0<g&&h<a.R.length;){var k=a.R[h],m=h*a.xb,q=a.xb-(f-m);q>g&&(q=g);if(k&&k.size){if(k.type==d&&k.controller==e){if(f+g<=k.he)return k.Ge+=k.he-f,k.he=f,!0;if(f>=k.he+k.Ge){q=k.size-(f-m);q>g&&(q=g);k.Ge=f-k.he+q;f=m+a.xb;g-=q;h++;continue}}return zb(a,1,f,g)}f=new u(f,q,a.xb,d,e);vb(f,a.Ia,k);a.R[h++]=f;f=m+a.xb;g-=q}return 0>=g?(e=a.A,e.Pa&-2147483648&&Ab(e),a.A.ea.Nb||a.status(Math.floor(c/1024)+"Kb "+Bb[d]+" at "+fa(b)),!0):zb(a,2,b,c)}
-var qb,Cb={Cj:20,count:8,jn:1,type:3},Db=0,Eb;for(Eb in Cb){var Fb=Cb[Eb];Cb[Eb]={sg:(1<<Fb)-1<<Db,shift:Db};Db+=Fb}qb=Cb;function wb(a,b){32==a.D?b?a.G&&(Gb(a,1048576,1048576,a.G),a.G=null):a.G||(a.G=Hb(a,1048576,1048576),Gb(a,1048576,1048576,Hb(a,0,1048576))):20<a.D&&(b=a.Fa&-1048577|(b?1048576:0),b!=a.Fa&&(a.Fa=b,a.A&&(a=a.A,a.Fa=a.oc=b)))}l=ub.prototype;
+var qb,Cb={Cj:20,count:8,kn:1,type:3},Db=0,Eb;for(Eb in Cb){var Fb=Cb[Eb];Cb[Eb]={sg:(1<<Fb)-1<<Db,shift:Db};Db+=Fb}qb=Cb;function wb(a,b){32==a.D?b?a.G&&(Gb(a,1048576,1048576,a.G),a.G=null):a.G||(a.G=Hb(a,1048576,1048576),Gb(a,1048576,1048576,Hb(a,0,1048576))):20<a.D&&(b=a.Fa&-1048577|(b?1048576:0),b!=a.Fa&&(a.Fa=b,a.A&&(a=a.A,a.Fa=a.oc=b)))}l=ub.prototype;
 l.$f=function(a,b,c,d){if(!(a&this.B||!b||b&this.B)){for(var e=a>>>this.da;0<b;){var f=this.R[e];if(!f.controller)return zb(this,3,a,b,d);Ib(f,c,!0);b-=this.xb;e++}return!0}return zb(this,4,a,b)};function Jb(a,b,c){if(!(b&a.B||!c||c&a.B)){for(var d=b>>>a.da;0<c;){var e=a.R[d];b=new u(b);vb(b,a.Ia,e);a.R[d++]=b;b=d*a.xb;c-=a.xb}a=a.A;a.Pa&-2147483648&&Ab(a);return!0}return zb(a,5,b,c)}function Hb(a,b,c){var d=[];for(b>>>=a.da;0<c&&b<a.R.length;)d.push(a.R[b++]),c-=a.xb;return d}
 function Gb(a,b,c,d,e){for(var f=0,g=b>>>a.da;0<c&&g<a.R.length;){var h=d[f++];if(!h)break;if(void 0!==e){var k=new u(b),m=k,q=e,y=a.Ia;m.id=h.id|1;m.Ge=h.Ge;m.size=h.size;q&&(m.type=q,m.I=q==Kb);fb?(m.R=h.R,m.S=h.S,m.Ka=h.Ka,m.td=h.td,m.V=h.V,Ib(m,Lb?Mb:Nb)):(m.V=h.V,Ib(m,Ob));vb(m,y,h);h=k}a.R[g++]=h;c-=a.xb}}l.Jb=function(a){return this.R[(a&this.Fa)>>>this.da].Wb(a&this.B,a)};
 l.ga=function(a){var b=a&this.B,c=(a&this.Fa)>>>this.da;return b!=this.B?this.R[c].Ae(b,a):this.R[c++].Wb(b,a)|this.R[c&this.C].Wb(0,a+1)<<8};function Pb(a,b){var c=b&a.B,d=(b&a.Fa)>>>a.da;return c!=a.B?a.R[d].hf(c,b):a.R[d++].Ed(c,b)|a.R[d&a.C].Ed(0,b+1)<<8}l.fa=function(a){var b=a&this.B,c=(a&this.Fa)>>>this.da;if(b<this.B-2)return this.R[c].Fd(b,a);for(var d=0,e=4,f=0,g=4-(b&3);e--;)d|=this.R[c].Wb(b++,a++)<<f,--g||(c=c+1&this.C,b=0),f+=8;return d};
@@ -400,7 +400,7 @@ var ce=[function(){this.A-=2+(-1===this.F?0:1);return this.Zb.ja},function(){thi
 var b=this.Ab;80286==this.ca?b|=-16777216:80386<=this.ca&&2!=this.U&&(a|=b<<16);this.Va(this.F+2,b);this.A-=12}return a},function(a){-1===this.F||this.X&131072?v.call(this,6):(this.ub=this.fa(this.F+2)&(this.N|this.N<<8),a&=65535,this.wc=this.ub+a,this.L|=2,this.A-=11);return a},function(a){-1===this.F||this.X&131072?v.call(this,6):(this.Ab=this.fa(this.F+2)&(this.N|this.N<<8),a&=65535,this.xc=this.Ab+a,this.L|=2,this.A-=12);return a},function(){this.A-=2+(-1===this.F?0:1);return this.Pa},T,function(a){this.X&
 131072?v.call(this,6):(Ce(this,a),this.A-=-1===this.F?3:6,this.L|=2);return a},T],Ai=[T,T,T,T,hg,kg,jg,ig];
 function U(a){Ka.call(this,"ChipSet",a,U);var b=a.model;b&&!Bi[b]&&r("Unrecognized ChipSet model: "+b);this.ca=Bi[b]||Ci;this.D=[];b=Di(a[Ei]);this.D[0]=[b,b];null==b&&(this.Y=[360,360],(b=a.floppies)&&b.length&&(this.Y=b),Fi(this,Gi,this.Y.length),Fi(this,Hi,a.monitor||(this.ca<Se?"mono":"ega")));b=Di(a[Ii]);this.D[1]=[b,b];this.Ea=this.pa=1;this.ca>=Se&&(this.Ea=this.pa=2);this.Z=a.scaleTimers||!1;this.Xa=a.rtcDate;this.Oa=!1;a.sound&&(this.La=this.qa=null,window&&(this.La=window.AudioContext||
-window.webkitAudioContext),this.La&&(this.qa=new this.La));this.reset(!0);t(this)}Ta(U);var Ci=5150.9,Se=5170,Bi={5150:5150,5160:5160,5170:Se,att6300:5160.101,mpc1600:5150.101,z150:5160.15,compaq:5150.102,other:Ci,deskpro386:5180},Ei="sw1",Ii="sw2",Ji={Yj:1,ONE:0,gn:64,en:128,Wm:192,lc:192,eg:6},Ki={fn:16,Sm:32,Xm:48,lc:48,eg:4},Gi=1,Hi=4,W={5150:[{},{}]};W[5150][0][Gi]={lc:192,Nc:{1:0,2:64,3:128,4:192},ed:"Number of Floppy Drives"};W[5150][0][3]={lc:2,Nc:{0:0,1:2},ed:"FPU"};
+window.webkitAudioContext),this.La&&(this.qa=new this.La));this.reset(!0);t(this)}Ta(U);var Ci=5150.9,Se=5170,Bi={5150:5150,5160:5160,5170:Se,att6300:5160.101,mpc1600:5150.101,z150:5160.15,compaq:5150.102,other:Ci,deskpro386:5180},Ei="sw1",Ii="sw2",Ji={Yj:1,ONE:0,hn:64,fn:128,Xm:192,lc:192,eg:6},Ki={gn:16,Sm:32,Ym:48,lc:48,eg:4},Gi=1,Hi=4,W={5150:[{},{}]};W[5150][0][Gi]={lc:192,Nc:{1:0,2:64,3:128,4:192},ed:"Number of Floppy Drives"};W[5150][0][3]={lc:2,Nc:{0:0,1:2},ed:"FPU"};
 W[5150][0][Hi]={lc:48,Nc:{0:0,1:16,2:32,3:48,none:0,tv:16,color:32,cga:32,mda:48,mono:48,ega:0,vga:0},ed:"Monitor Type"};W[5150][0][5]={lc:12,Nc:{16:0,32:4,48:8,64:12},ed:"Base Memory (16Kb Increments)"};W[5150][1][6]={lc:31,Nc:{0:0,32:1,64:2,96:3,128:4,160:5,192:6,224:7,256:8,288:9,320:10,352:11,384:12,416:13,448:14,480:15,512:16,544:17,576:18},ed:"Expansion Memory (32Kb Increments)"};W[5160]=[{},{}];W[5160][0][Gi]=W[5150][0][Gi];W[5160][0][3]=W[5150][0][3];W[5160][0][Hi]=W[5150][0][Hi];
 W[5160][0][5]={lc:12,Nc:{64:0,128:4,192:8,256:12},ed:"Base Memory (64Kb Increments)"};W[5160][1][6]=W[5150][1][6];W[5160.101]=[{},{}];W[5160.101][0][5]={lc:143,Nc:{128:1,256:130,512:8,640:141},ed:"Base Memory (128Kb Increments)"};W[5160.101][0][3]={lc:16,Nc:{0:0,1:16},ed:"FPU"};W[5160.101][1][2]={lc:1,Nc:{0:0,1:1},ed:"Floppy Type"};W[5160.101][1][Gi]=W[5150][0][Gi];W[5160.101][1][Hi]=W[5150][0][Hi];l=U.prototype;
 l.zb=function(a,b,c){switch(b){case Ei:return this.la[b]=c,Li(this,0,b),!0;case Ii:if(5150==(this.ca|0)||5160.101==this.ca)return this.la[b]=c,Li(this,1,b),!0;break;case "swdesc":return this.la[b]=c,!0}return!1};
@@ -414,7 +414,7 @@ b,this.za]);a.set(4,[this.Da,this.S,this.Ja,this.oa,this.ma]);this.ca>=Se&&(a.se
 l.restore=function(a){var b,c;b=a[0];Array.isArray(b[0])?this.D=b[0]:(this.D[0][0]=b[0],this.D[1][0]=b[1]&15,this.D[0][1]=b[2],this.D[1][1]=b[3]&15);Wi(this);b=a[1];for(c=0;c<this.Ea;c++)Xi(this,c,1==b.length?b[0][c]:b);b=a[2];for(c=0;c<this.pa;c++)Yi(this,c,c?160:32,b[0][c]);b=a[3];this.xa=b[0];this.za=b[2];for(c=0;c<this.K.length;c++)Zi(this,c,b[1][c]);b=a[4];this.Da=b[0];this.S=b[1];this.Ja=b[2];this.oa=b[3];this.ma=b[4];if(b=a[5])this.H=b[0],this.P=b[1],this.R=b[2],this.ua=b[3],this.W=b[4],this.va=
 b[5];if(b=a[6])this.I=b[1],this.I[7]=b[0],this.da=b[2],this.B=b[3],this.ra=b[4],this.ha=b[5],bj(this);return!0};l.start=function(){fj(this)};l.stop=function(){fj(this)};var gj=[0,null,null,0,Array(4),0];function Xi(a,b,c){var d=a.G[b];d||(d={$b:Array(4)});c=c&&5<=c.length?c:gj;d.Db=c[0];d.hg=c[1];d.hi=c[2];d.Ib=c[3];d.Gl=b<<2;for(var e=0;e<d.$b.length;e++)hj(d,e,c[4][e]);d.jg=c[5]||0;a.G[b]=d}var ij=[!0,[0,0],[0,0],[0,0],[0,0]];
 function hj(a,b,c){var d=a.$b[b];d||(d={wf:[0,0],jc:[0,0],gb:[0,0],hb:[0,0]});c=c&&8==c.length?c:ij;d.Rd=c[0];d.wf[0]=c[1][0];d.wf[1]=c[1][1];d.jc[0]=c[2][0];d.jc[1]=c[2][1];d.gb[0]=c[3][0];d.gb[1]=c[3][1];d.hb[0]=c[4][0];d.hb[1]=c[4][1];d.mode=c[5];d.xf=c[6];d.controller=a;d.vi=b;jj(d,c[8],c[9]);a.$b[b]=d}function jj(a,b,c,d){"string"==typeof b&&(b=Xa(b));b&&(a.done=null,a.Nm=b.id,a.Om=c,a.Ef=b,a.qg=b[c],a.Sf=d)}var kj=[0,Array(4)];
-function Yi(a,b,c,d){var e=a.gc[b];e||(e={Rc:[null,null,null,null]});d=d&&8==d.length?d:kj;e.port=c;e.kn=b<<3;e.We=d[0];e.Rc[0]=d[1][0];e.Rc[1]=d[1][1];e.Rc[2]=d[1][2];e.Rc[3]=d[1][3];e.kd=d[2];e.Uc=d[3];e.ac=d[4];e.Cc=d[5];e.Md=d[6];e.Ne=d[7];a.gc[b]=e}var lj=[[0,0],[0,0],[0,0],[0,0]];
+function Yi(a,b,c,d){var e=a.gc[b];e||(e={Rc:[null,null,null,null]});d=d&&8==d.length?d:kj;e.port=c;e.ln=b<<3;e.We=d[0];e.Rc[0]=d[1][0];e.Rc[1]=d[1][1];e.Rc[2]=d[1][2];e.Rc[3]=d[1][3];e.kd=d[2];e.Uc=d[3];e.ac=d[4];e.Cc=d[5];e.Md=d[6];e.Ne=d[7];a.gc[b]=e}var lj=[[0,0],[0,0],[0,0],[0,0]];
 function Zi(a,b,c){var d=a.K[b];d||(d={jc:[0,0],Ec:[0,0],hb:[0,0],Nd:[0,0]});c=c&&13<=c.length?c:lj;d.jc[0]=c[0][0];d.jc[1]=c[0][1];d.Ec[0]=c[1][0];d.Ec[1]=c[1][1];d.hb[0]=c[2][0];d.hb[1]=c[2][1];d.Nd[0]=c[3][0];d.Nd[1]=c[3][1];d.kg=c[4];d.mode=c[5];d.mf=c[6];d.Wc=c[7];d.hd=c[8];d.Sc=c[9];d.oe=c[10];d.Pd=c[11];d.jd=c[12];d.Db=c[13]||0;d.se=c[14]||!1;a.K[b]=d}
 function Li(a,b,c){for(var d="",e=a.la[c],f=1;8>=f;f++){var g="pcjs-bitCell";f||(g+=" pcjs-bitCellLeft");d+='<div id="'+(c+"-"+f)+'" class="'+g+'" data-value="0">'+f+"</div>\n"}e.innerHTML=d;mj(a,b,c,!0)}function nj(a,b,c){if(b=(a=W[a.ca|0])&&a[b])for(var d in b)if(a=b[d],a.lc&1<<c)return a;return null}
 function aj(a,b,c){for(var d=null,e=W[a.ca]||W[a.ca|0]||W[5150],f=0;f<e.length;f++){var g=e[f];if(g&&(g=g[b])){a=a.D[f][c?0:1]&g.lc;for(var h in g.Nc)if(g.Nc[h]==a&&(d=h,"number"==typeof+d))break;break}}return d}function cj(a,b){if(b<+aj(a,Gi,void 0)){if(!a.Y)return 1;if(b<a.Y.length)switch(a.Y[b]){case 160:case 180:case 320:case 360:return 1;case 720:return 3;case 1200:return 2;case 1440:return 4}}return 0}function $i(a,b){return+aj(a,5,b)+ +aj(a,6,b)}
@@ -593,7 +593,7 @@ l.restore=function(a){var b=0,c="unsupported restore format";if(a&&0<a.length){v
 b+" changes applied)";b=-1;break}if(this.te){c="unable to modify write-protected disk";b=-1;break}e=g[f++];f=g[f++];g=e+f.length;if(h=this.A[h][k][m]){for(k=h.data.length;k<e;)h.data[k++]=h.pattern;k=0;h.Tc=e;for(h.Dc=f.length;e<g;)h.data[e++]=f[k++];b++}}}0>b&&-2!=b&&this.controller.Ba("Unable to restore disk '"+this.B+": "+c);return b};
 l.toJSON=function(){var a;a=0;for(var b;b=km(this,a++);)sm(b);a=JSON.stringify(this.A,function(a,b){if("file"!=a)return b});a=a.replace(/,"length":512/gm,"").replace(/,"pattern":0/gm,"");a=a.replace(/"(sector|length|data|pattern)":/gm,"$1:");a=a.replace(/,"[^"]*":([0-9]+|true|false)/gm,"");a=a.replace(/(sector|length|data|pattern):/gm,'"$1":');return a=a.replace(/([\]}]),/gm,"$1,\n")};
 function sm(a){var b=a.data,c=b.length;if(c<<2==a.length){for(var d=c-1,e=b[d],f=0;d--&&b[d]===e;)f++;f++&&(b.length=c-f,a.pattern=e)}}function tm(a){Ka.call(this,"FDC",a,tm);this.dmaRead=this.Tj;this.dmaWrite=this.Uj;this.dmaFormat=this.hk;this.K=a.autoMount||null;this.W=a.sortBy||"name";"none"==this.W&&(this.W=null);this.C=[];this.Y=!za("Mobi")&&window&&"FileReader"in window}Ta(tm);ba={};
-var um={3:{gd:3,wd:0,name:ba.dn},4:{gd:2,wd:1,name:ba.bn},5:{gd:9,wd:7,name:ba.hn},6:{gd:9,wd:7,name:ba.Ym},7:{gd:2,wd:0,name:ba.$m},8:{gd:1,wd:2,name:ba.cn},10:{gd:2,wd:7,name:ba.Zm},13:{gd:6,wd:7,name:ba.Vm},15:{gd:3,wd:0,name:ba.an}};l=tm.prototype;
+var um={3:{gd:3,wd:0,name:ba.en},4:{gd:2,wd:1,name:ba.cn},5:{gd:9,wd:7,name:ba.jn},6:{gd:9,wd:7,name:ba.Zm},7:{gd:2,wd:0,name:ba.an},8:{gd:1,wd:2,name:ba.dn},10:{gd:2,wd:7,name:ba.$m},13:{gd:6,wd:7,name:ba.Wm},15:{gd:3,wd:0,name:ba.bn}};l=tm.prototype;
 l.zb=function(a,b,c){var d=this;switch(b){case "listDisks":this.la[b]=c;if(this.W){b=[];for(a=0;a<c.options.length;a++)b.push(c.options[a]);b.sort(function(a,b){return"path"!=d.W?a.text.localeCompare(b.text):a.value.localeCompare(b.value)});for(a=0;a<b.length;a++)try{c.options[a]=b[a]}catch(e){break}}c.onchange=function(){var a=d.la.descDisk,b=c.options[c.selectedIndex];if(a&&b){var g={};if(b=b.getAttribute("data-value"))try{g=eval("("+b+")")}catch(h){r("FDC option error: "+h.message)}b=g.desc;void 0===
 b&&(b="");g=g.href;void 0!==g&&(b='<a href="'+g+'" target="_blank">'+b+"</a>");a.innerHTML=b}};return!0;case "descDisk":case "listDrives":return this.la[b]=c,c.onchange=function(){var a=ea(c.value,10);null!=a&&vm(d,a)},!0;case "loadDrive":return this.la[b]=c,c.onclick=function(){var a=d.la.listDisks;a&&wm(d,a.options[a.selectedIndex].text,a.value)},!0;case "saveDrive":if(!this.Y){c.parentNode.removeChild(c);break}this.la[b]=c;c.onclick=function(){var a=d.la.listDrives;a&&a.options&&d.B&&((a=d.B[ea(a.value,
 10)||0])?(a=a.ta)?(a=Aa(rm(a),"octet-stream",!0,a.th.replace(".json",".img")),r(a)):d.Ba("No diskette loaded in drive."):d.Ba("No diskette drive selected."))};return!0;case "mountDrive":if(this.Y)return this.la[b]=c,c.addEventListener("change",function(){var a=c.children[0];a.children[1].disabled=!a.children[0].files.length}),c.onsubmit=function(a){if(a=a.currentTarget[1].files[0]){var b=a.name;wm(d,ga(b,!0),b,a)}return!1},!0;c.parentNode.removeChild(c)}return!1};
diff --git a/modules/pdp11/lib/bus.js b/modules/pdp11/lib/bus.js
index eca42c0b1..95ae13c45 100644
--- a/modules/pdp11/lib/bus.js
+++ b/modules/pdp11/lib/bus.js
@@ -277,7 +277,7 @@ BusPDP11.IOController = {
             }
         }
         if (b >= 0) {
-            if (DEBUGGER && this.dbg && this.dbg.messageEnabled(afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
+            if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS | afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
                 this.dbg.printMessage(afn[BusPDP11.IOHANDLER.NAME] + ".readByte(" + this.dbg.toStrBase(addr) + "): " + this.dbg.toStrBase(b), true, !bus.nDisableFaults);
             }
             return b;
@@ -358,7 +358,7 @@ BusPDP11.IOController = {
             }
         }
         if (fWrite) {
-            if (DEBUGGER && this.dbg && this.dbg.messageEnabled(afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
+            if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS | afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
                 this.dbg.printMessage(afn[BusPDP11.IOHANDLER.NAME] + ".writeByte(" + this.dbg.toStrBase(addr) + "," + this.dbg.toStrBase(b) + ")", true, !bus.nDisableFaults);
             }
             return;
@@ -397,7 +397,7 @@ BusPDP11.IOController = {
             }
         }
         if (w >= 0) {
-            if (DEBUGGER && this.dbg && this.dbg.messageEnabled(afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
+            if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS | afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
                 this.dbg.printMessage(afn[BusPDP11.IOHANDLER.NAME] + ".readWord(" + this.dbg.toStrBase(addr) + "): " + this.dbg.toStrBase(w), true, !bus.nDisableFaults);
             }
             return w;
@@ -441,7 +441,7 @@ BusPDP11.IOController = {
             }
         }
         if (fWrite) {
-            if (DEBUGGER && this.dbg && this.dbg.messageEnabled(afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
+            if (DEBUGGER && this.dbg && this.dbg.messageEnabled(MessagesPDP11.BUS | afn[BusPDP11.IOHANDLER.MSG_CATEGORY])) {
                 this.dbg.printMessage(afn[BusPDP11.IOHANDLER.NAME] + ".writeWord(" + this.dbg.toStrBase(addr) + "," + this.dbg.toStrBase(w) + ")", true, !bus.nDisableFaults);
             }
             return;
@@ -1265,7 +1265,7 @@ BusPDP11.prototype.getMemorySize = function(type)
 };
 
 /**
- * addIOHandlers(start, end, fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, msgCategory, sName)
+ * addIOHandlers(start, end, fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, message, sName)
  *
  * Add I/O notification handlers to the master list (aIOHandlers).  The start and end addresses are typically
  * relative to the starting IOPAGE address, but they can also be absolute; we simply mask all addresses with
@@ -1285,11 +1285,11 @@ BusPDP11.prototype.getMemorySize = function(type)
  * @param {function(number,number)|null|undefined} fnWriteByte
  * @param {function(number)|null|undefined} fnReadWord
  * @param {function(number,number)|null|undefined} fnWriteWord
- * @param {number} [msgCategory]
+ * @param {number} [message]
  * @param {string} [sName]
  * @return {boolean} (true if entire range successfully registered, false if any conflicts)
  */
-BusPDP11.prototype.addIOHandlers = function(start, end, fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, msgCategory, sName)
+BusPDP11.prototype.addIOHandlers = function(start, end, fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, message, sName)
 {
     for (var addr = start; addr <= end; addr += 2) {
         var off = addr & BusPDP11.IOPAGE_MASK;
@@ -1297,7 +1297,7 @@ BusPDP11.prototype.addIOHandlers = function(start, end, fnReadByte, fnWriteByte,
             Component.warning("I/O address already registered: " + str.toHexLong(addr));
             return false;
         }
-        this.aIOHandlers[off] = [fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, sName || "unknown", msgCategory, false];
+        this.aIOHandlers[off] = [fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, sName || "unknown", message || MessagesPDP11.BUS, false];
         if (MAXDEBUG) this.log("addIOHandlers(" + str.toHexLong(addr) + ")");
     }
     return true;
@@ -1356,7 +1356,7 @@ BusPDP11.prototype.addIOTable = function(component, table)
 
         for (var iReg = 0; iReg < nRegs; iReg++, addr += 2) {
             if (sReg && nRegs > 1) sReg = afn[4] + iReg;
-            if (!this.addIOHandlers(addr, addr, fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, afn[7] || component.bitsMessage || MessagesPDP11.BUS, sReg || component.idComponent)) {
+            if (!this.addIOHandlers(addr, addr, fnReadByte, fnWriteByte, fnReadWord, fnWriteWord, afn[7] || component.bitsMessage, sReg || component.idComponent)) {
                 return false;
             }
         }
diff --git a/modules/pdp11/lib/cpustate.js b/modules/pdp11/lib/cpustate.js
index 4577e1943..8e8fd3695 100644
--- a/modules/pdp11/lib/cpustate.js
+++ b/modules/pdp11/lib/cpustate.js
@@ -111,6 +111,7 @@ Component.subclass(CPUStatePDP11, CPUPDP11);
  * @typedef {{
  *  vector: number,
  *  priority: number,
+ *  message: number,
  *  next: (Trigger|null)
  * }} Trigger
  */
@@ -767,16 +768,17 @@ CPUStatePDP11.prototype.setSP = function(addr)
 };
 
 /**
- * addTrigger(vector, priority)
+ * addTrigger(vector, priority, message)
  *
  * @this {CPUStatePDP11}
  * @param {number} vector
  * @param {number} priority
+ * @param {number} [message]
  * @return {Trigger}
  */
-CPUStatePDP11.prototype.addTrigger = function(vector, priority)
+CPUStatePDP11.prototype.addTrigger = function(vector, priority, message)
 {
-    var trigger = {vector: vector, priority: priority, next: null};
+    var trigger = {vector: vector, priority: priority, message: message || 0, next: null};
     if (DEBUG) this.aTriggers.push(trigger);
     return trigger;
 };
@@ -842,14 +844,34 @@ CPUStatePDP11.prototype.removeTrigger = function(trigger)
 CPUStatePDP11.prototype.setTrigger = function(trigger)
 {
     this.insertTrigger(trigger);
+
     /*
      * See the writeXCSR() function for an explanation of why signalling an INTQ hardware interrupt condition
      * should be done using INTQ_DELAY rather than setting INTQ directly.
      */
     this.opFlags |= PDP11.OPFLAG.INTQ_DELAY;
+
+    if (trigger.message && this.messageEnabled(trigger.message | MessagesPDP11.INT)) {
+        this.printMessage("setInterrupt(vector=" + str.toOct(trigger.vector) + ",priority=" + trigger.priority + ")", true, true);
+    }
     return false;
 };
 
+/**
+ * clearTrigger(trigger)
+ *
+ * @this {CPUStatePDP11}
+ * @param {Trigger} trigger
+ */
+CPUStatePDP11.prototype.clearTrigger = function(trigger)
+{
+    this.removeTrigger(trigger);
+
+    if (trigger.message && this.messageEnabled(trigger.message | MessagesPDP11.INT)) {
+        this.printMessage("clearInterrupt(vector=" + str.toOct(trigger.vector) + ",priority=" + trigger.priority + ")", true, true);
+    }
+};
+
 /**
  * checkTriggers(priority)
  *
diff --git a/modules/pdp11/lib/defines.js b/modules/pdp11/lib/defines.js
index c61a5969d..72d07dd61 100644
--- a/modules/pdp11/lib/defines.js
+++ b/modules/pdp11/lib/defines.js
@@ -492,10 +492,10 @@ var PDP11 = {
         PPS:        0o177554,   //                                  PC11 Punch Status Register
         PPB:        0o177556,   //                                  PC11 Punch Buffer Register
 
-        RCSR:       0o177560,   //                                  Display Terminal: Receiver Status Register
-        RBUF:       0o177562,   //                                  Display Terminal: Receiver Data Buffer Register
-        XCSR:       0o177564,   //                                  Display Terminal: Transmitter Status Register
-        XBUF:       0o177566,   //                                  Display Terminal: Transmitter Data Buffer Register
+        RCSR:       0o177560,   //                                  DL11 Display Terminal: Receiver Status Register
+        RBUF:       0o177562,   //                                  DL11 Display Terminal: Receiver Data Buffer Register
+        XCSR:       0o177564,   //                                  DL11 Display Terminal: Transmitter Status Register
+        XBUF:       0o177566,   //                                  DL11 Display Terminal: Transmitter Data Buffer Register
 
         CNSW:       0o177570,   //                                  Console (Front Panel) Switch/Display Register
 
diff --git a/modules/pdp11/lib/device.js b/modules/pdp11/lib/device.js
index fa33c1b73..6d038e96e 100644
--- a/modules/pdp11/lib/device.js
+++ b/modules/pdp11/lib/device.js
@@ -90,7 +90,7 @@ DevicePDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
         device.interruptKW11();
     });
 
-    this.kw11.trigger = cpu.addTrigger(PDP11.KW11.VEC, PDP11.KW11.PRI);
+    this.kw11.trigger = cpu.addTrigger(PDP11.KW11.VEC, PDP11.KW11.PRI, MessagesPDP11.KW11);
 
     bus.addIOTable(this, DevicePDP11.UNIBUS_IOTABLE);
     bus.addResetHandler(this.reset.bind(this));
diff --git a/modules/pdp11/lib/messages.js b/modules/pdp11/lib/messages.js
index 080177085..94659475a 100644
--- a/modules/pdp11/lib/messages.js
+++ b/modules/pdp11/lib/messages.js
@@ -34,23 +34,30 @@
 
 var MessagesPDP11 = {
     CPU:        0x00000001,
-    TRAP:       0x00000010,
-    FAULT:      0x00000020,
-    BUS:        0x00000040,
-    MEMORY:     0x00000080,
-    MMU:        0x00000100,
-    ROM:        0x00000200,
-    DEVICE:     0x00000400,
-    PANEL:      0x00000800,
-    KEYBOARD:   0x00010000,
-    KEYS:       0x00020000,
-    PAPER:      0x00100000,
-    DISK:       0x00200000,
-    RK11:       0x00400000,
-    RL11:       0x00800000,
-    SERIAL:     0x01000000,
-    SPEAKER:    0x02000000,
-    COMPUTER:   0x04000000,
+    TRAP:       0x00000002,
+    FAULT:      0x00000004,
+    INT:        0x00000008,
+    BUS:        0x00000010,
+    MEMORY:     0x00000020,
+    MMU:        0x00000040,
+    ROM:        0x00000080,
+    DEVICE:     0x00000100,
+    PANEL:      0x00000200,
+    KEYBOARD:   0x00000400,
+    KEYS:       0x00000800,
+    PC11:       0x00001000,
+    PAPER:      0x00001000,
+    DISK:       0x00002000,
+    READ:       0x00004000,
+    WRITE:      0x00008000,
+    RK11:       0x00010000,
+    RL11:       0x00020000,
+    DL11:       0x00040000,
+    SERIAL:     0x00040000,
+    KW11:       0x00080000,
+    TIMER:      0x00080000,
+    SPEAKER:    0x01000000,
+    COMPUTER:   0x02000000,
     LOG:        0x10000000,
     WARN:       0x20000000,
     BUFFER:     0x40000000,
@@ -75,6 +82,7 @@ MessagesPDP11.CATEGORIES = {
     "cpu":      MessagesPDP11.CPU,
     "trap":     MessagesPDP11.TRAP,
     "fault":    MessagesPDP11.FAULT,
+    "int":      MessagesPDP11.INT,
     "bus":      MessagesPDP11.BUS,
     "memory":   MessagesPDP11.MEMORY,
     "mmu":      MessagesPDP11.MMU,
@@ -83,11 +91,17 @@ MessagesPDP11.CATEGORIES = {
     "panel":    MessagesPDP11.PANEL,
     "keyboard": MessagesPDP11.KEYBOARD, // "kbd" is also allowed as shorthand for "keyboard"; see doMessages()
     "key":      MessagesPDP11.KEYS,     // using "key" instead of "keys", since the latter is a method on JavasScript objects
+    "pc11":     MessagesPDP11.PC11,
     "paper":    MessagesPDP11.PAPER,
     "disk":     MessagesPDP11.DISK,
+    "read":     MessagesPDP11.READ,
+    "write":    MessagesPDP11.WRITE,
     "rk11":     MessagesPDP11.RK11,
     "rl11":     MessagesPDP11.RL11,
+    "dl11":     MessagesPDP11.DL11,
     "serial":   MessagesPDP11.SERIAL,
+    "kw11":     MessagesPDP11.KW11,
+    "timer":    MessagesPDP11.TIMER,
     "speaker":  MessagesPDP11.SPEAKER,
     "computer": MessagesPDP11.COMPUTER,
     "log":      MessagesPDP11.LOG,
diff --git a/modules/pdp11/lib/pc11.js b/modules/pdp11/lib/pc11.js
index 53c761153..2079b0676 100644
--- a/modules/pdp11/lib/pc11.js
+++ b/modules/pdp11/lib/pc11.js
@@ -280,7 +280,7 @@ PC11.prototype.initBus = function(cmp, bus, cpu, dbg)
         }
     }
 
-    this.triggerReaderInterrupt = this.cpu.addTrigger(PDP11.PC11.RVEC, PDP11.PC11.PRI);
+    this.triggerReaderInterrupt = this.cpu.addTrigger(PDP11.PC11.RVEC, PDP11.PC11.PRI, MessagesPDP11.PC11);
 
     this.timerReaderAdvance = this.cpu.addTimer(function readyReader() {
         pc11.advanceReader();
diff --git a/modules/pdp11/lib/rk11.js b/modules/pdp11/lib/rk11.js
index 097835138..fd2336930 100644
--- a/modules/pdp11/lib/rk11.js
+++ b/modules/pdp11/lib/rk11.js
@@ -290,7 +290,7 @@ RK11.prototype.initBus = function(cmp, bus, cpu, dbg)
      */
     this.initController();
 
-    this.triggerInterrupt = this.cpu.addTrigger(PDP11.RK11.VEC, PDP11.RK11.PRI);
+    this.triggerInterrupt = this.cpu.addTrigger(PDP11.RK11.VEC, PDP11.RK11.PRI, MessagesPDP11.RK11);
 
     bus.addIOTable(this, RK11.UNIBUS_IOTABLE);
     bus.addResetHandler(this.reset.bind(this));
@@ -931,6 +931,10 @@ RK11.prototype.processCommand = function()
         }
         addr = (((this.csr & PDP11.RK11.RKCS.MEX)) << (16 - PDP11.RK11.RKCS.SHIFT.MEX)) | this.bar;
         nWords = (0x10000 - this.wcr) & 0xffff;
+        if (DEBUG && this.messageEnabled(MessagesPDP11.READ)) {
+            var pos = ((((iCylinder << 1) + iHead) * drive.nSectors) + iSector) * 256;
+            this.printMessage((fnReadWrite == this.readData? "readData" : "writeData") + "(pos=" + pos + ",addr=" + str.toOct(addr) + ",bytes=" + (nWords * 2) + ")", true, true);
+        }
         fInterrupt = fnReadWrite.call(this, drive, iCylinder, iHead, iSector, nWords, addr, this.endReadWrite.bind(this));
         break;
 
@@ -952,8 +956,6 @@ RK11.prototype.processCommand = function()
     }
 };
 
-
-
 /**
  * endReadWrite(err, iCylinder, iHead, iSector, nWords, addr)
  *
@@ -1002,6 +1004,7 @@ RK11.prototype.readData = function(drive, iCylinder, iHead, iSector, nWords, add
         nWords = 0;
     }
 
+    var sWords = "";
     while (nWords--) {
         if (!sector) {
             sector = drive.disk.seek(iCylinder, iHead, iSector + 1);
@@ -1011,12 +1014,16 @@ RK11.prototype.readData = function(drive, iCylinder, iHead, iSector, nWords, add
             }
             ibSector = 0;
         }
-        var b0, b1;
+        var b0, b1, data;
         if ((b0 = drive.disk.read(sector, ibSector++)) < 0 || (b1 = drive.disk.read(sector, ibSector++)) < 0) {
             err = PDP11.RK11.RKER.NXS;
             break;
         }
-        var data = this.bus.setWordDirect(addr, b0 | (b1 << 8));
+        this.bus.setWordDirect(addr, data = b0 | (b1 << 8));
+        if (DEBUG && this.messageEnabled(MessagesPDP11.READ) && sWords.length < 56) {
+            sWords += str.toOct(data) + ' ';
+            if (sWords.length >= 56) this.printMessage(sWords + '\n', true);
+        }
         if (this.bus.checkFault()) {
             err = PDP11.RK11.RKER.NXM;
             break;
diff --git a/modules/pdp11/lib/rl11.js b/modules/pdp11/lib/rl11.js
index 57498f5e0..a78ae03e0 100644
--- a/modules/pdp11/lib/rl11.js
+++ b/modules/pdp11/lib/rl11.js
@@ -290,7 +290,7 @@ RL11.prototype.initBus = function(cmp, bus, cpu, dbg)
      */
     this.initController();
 
-    this.triggerInterrupt = this.cpu.addTrigger(PDP11.RL11.VEC, PDP11.RL11.PRI);
+    this.triggerInterrupt = this.cpu.addTrigger(PDP11.RL11.VEC, PDP11.RL11.PRI, MessagesPDP11.RL11);
 
     bus.addIOTable(this, RL11.UNIBUS_IOTABLE);
     bus.addResetHandler(this.reset.bind(this));
diff --git a/modules/pdp11/lib/serialport.js b/modules/pdp11/lib/serialport.js
index 9d1059cd8..2bcee3518 100644
--- a/modules/pdp11/lib/serialport.js
+++ b/modules/pdp11/lib/serialport.js
@@ -36,6 +36,7 @@ if (NODE) {
     var str           = require("../../shared/lib/strlib");
     var web           = require("../../shared/lib/weblib");
     var Component     = require("../../shared/lib/component");
+    var Keys          = require("../../shared/lib/keys");
     var State         = require("../../shared/lib/state");
     var PDP11         = require("./defines");
     var MessagesPDP11 = require("./messages");
@@ -195,26 +196,24 @@ SerialPortPDP11.prototype.setBinding = function(sType, sBinding, control, sValue
         this.bindings[sBinding] = this.controlIOBuffer = control;
 
         /*
-         * By establishing an onkeypress handler here, we make it possible for DOS commands like
-         * "CTTY COM1" to more or less work (use "CTTY CON" to restore control to the DOS console).
+         * An onkeydown handler is required for certain keys that browsers tend to consume themselves;
+         * for example, BACKSPACE is often defined as going back to the previous web page, and certain
+         * CTRL keys are often used for browser shortcuts (usually on Windows-based browsers).
          */
         control.onkeydown = function onKeyDown(event) {
-            /*
-             * This is required in addition to onkeypress, because it's the only way to prevent
-             * BACKSPACE (keyCode 8) from being interpreted by the browser as a "Back" operation;
-             * moreover, not all browsers generate an onkeypress notification for BACKSPACE.
-             *
-             * A related problem exists for Ctrl-key combinations in most Windows-based browsers
-             * (eg, IE, Edge, Chrome for Windows, etc), because keys like Ctrl-C and Ctrl-S have
-             * special meanings (eg, Copy, Save).  To the extent the browser will allow it, we
-             * attempt to disable that default behavior when this control receives an onkeydown
-             * event for one of those keys (probably the only event the browser generates for them).
-             */
             event = event || window.event;
+            var fProcess = false;
             var keyCode = event.keyCode;
-            if (keyCode === 0x08 || event.ctrlKey && keyCode >= 0x41 && keyCode <= 0x5A) {
+            if (keyCode == Keys.KEYCODE.BS) {
+                fProcess = true;
+                keyCode = Keys.ASCII.DEL;
+            }
+            else if (event.ctrlKey && keyCode >= Keys.ASCII.A && keyCode <= Keys.ASCII.Z) {
+                fProcess = true;
+                keyCode -= (Keys.ASCII.A - Keys.ASCII.CTRL_A);
+            }
+            if (fProcess) {
                 if (event.preventDefault) event.preventDefault();
-                if (keyCode > 0x40) keyCode -= 0x40;
                 serial.receiveData(keyCode);
             }
             return true;
@@ -285,7 +284,7 @@ SerialPortPDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
 
     var serial = this;
 
-    this.triggerReceiveInterrupt = this.cpu.addTrigger(PDP11.DL11.RVEC, PDP11.DL11.PRI);
+    this.triggerReceiveInterrupt = this.cpu.addTrigger(PDP11.DL11.RVEC, PDP11.DL11.PRI, MessagesPDP11.DL11);
 
     this.timerReceiveInterrupt = this.cpu.addTimer(function readyReceiver() {
         if (!(serial.rcsr & PDP11.DL11.RCSR.RD)) {
@@ -315,7 +314,7 @@ SerialPortPDP11.prototype.initBus = function(cmp, bus, cpu, dbg)
         }
     });
 
-    this.triggerTransmitInterrupt = this.cpu.addTrigger(PDP11.DL11.XVEC, PDP11.DL11.PRI);
+    this.triggerTransmitInterrupt = this.cpu.addTrigger(PDP11.DL11.XVEC, PDP11.DL11.PRI, MessagesPDP11.DL11);
 
     this.timerTransmitInterrupt = this.cpu.addTimer(function readyTransmitter() {
         serial.xcsr |= PDP11.DL11.XCSR.READY;
@@ -584,7 +583,15 @@ SerialPortPDP11.prototype.transmitByte = function(b)
              */
             if (this.iLogicalCol > 0) this.iLogicalCol--;
         }
-        else {
+        else if (b) {
+            /*
+             * RT-11 outputs lots of NULL characters, at least after a "D 56=5015" (0x0A0D) command has
+             * been issued, hence the "if (b)" check above.
+             *
+             * TODO: Also consider a check for Keys.ASCII.CTRL_C, because by default, RT-11 outputs "raw"
+             * CTRL_C characters, which we capture below and render as <ETX>.  RT-11 does this for other keys
+             * as well, such as CTRL_K (<VT>) and CTRL_L (<FF>).
+             */
             var s = str.toASCIICode(b); // formerly: String.fromCharCode(b);
             var nChars = s.length;      // formerly: (b >= 0x20? 1 : 0);
             if (b < 0x20 && nChars == 1) nChars = 0;
@@ -698,7 +705,7 @@ SerialPortPDP11.prototype.writeXCSR = function(data, addr)
         if (data & PDP11.DL11.XCSR.TIE) {
             this.cpu.setTrigger(this.triggerTransmitInterrupt);
         } else {
-            this.cpu.removeTrigger(this.triggerTransmitInterrupt);
+            this.cpu.clearTrigger(this.triggerTransmitInterrupt);
         }
     }
     this.xcsr = (this.xcsr & ~PDP11.DL11.XCSR.WMASK) | (data & PDP11.DL11.XCSR.WMASK);
@@ -726,16 +733,14 @@ SerialPortPDP11.prototype.readXBUF = function(addr)
 SerialPortPDP11.prototype.writeXBUF = function(data, addr)
 {
     data &= PDP11.DL11.XBUF.DATA;
-    if (data) {
-        this.transmitByte(data);
-        this.xcsr &= ~PDP11.DL11.XCSR.READY;
-        /*
-         * NOTE: When debugging issues involving the SerialPort, such as debugging code between a pair of
-         * transmitted bytes, you can pass 0 instead of getBaudTimeout() to setTimer() to minimize the amount
-         * of time spent waiting for XCSR.READY to be set again.
-         */
-        this.cpu.setTimer(this.timerTransmitInterrupt, this.getBaudTimeout(this.nBaudTransmit));
-    }
+    this.transmitByte(data);
+    this.xcsr &= ~PDP11.DL11.XCSR.READY;
+    /*
+     * NOTE: When debugging issues involving the SerialPort, such as debugging code between a pair of
+     * transmitted bytes, you can pass 0 instead of getBaudTimeout() to setTimer() to minimize the amount
+     * of time spent waiting for XCSR.READY to be set again.
+     */
+    this.cpu.setTimer(this.timerTransmitInterrupt, this.getBaudTimeout(this.nBaudTransmit));
 };
 
 /*
diff --git a/modules/shared/lib/keys.js b/modules/shared/lib/keys.js
index ddf95d8c4..ca9921917 100644
--- a/modules/shared/lib/keys.js
+++ b/modules/shared/lib/keys.js
@@ -49,7 +49,7 @@ var Keys = {
             '`': 96,     a:  97,     b:  98,     c:  99,     d: 100,     e: 101,     f: 102,     g: 103,
              h:  104,    i: 105,     j: 106,     k: 107,     l: 108,     m: 109,     n: 110,     o: 111,
              p:  112,    q: 113,     r: 114,     s: 115,     t: 116,     u: 117,     v: 118,     w: 119,
-             x:  120,    y: 121,     z: 122,    '{':123,    '|':124,    '}':125,    '~':126
+             x:  120,    y: 121,     z: 122,    '{':123,    '|':124,    '}':125,    '~':126,   DEL: 127
     },
     /*
      * Browser keyCodes we must pay particular attention to.  For the most part, these are non-alphanumeric
@@ -62,10 +62,10 @@ var Keys = {
      * them using ASCII codes (eg, the LEFT arrow key uses the ASCII code for '%' or 37).
      */
     KEYCODE: {
-        /* 0x08 */ BS:          8,
+        /* 0x08 */ BS:          8,          // BACKSPACE
         /* 0x09 */ TAB:         9,
-        /* 0x0A */ LF:          10,         // TODO: Determine if any key actually generates this
-        /* 0x0D */ CR:          13,
+        /* 0x0A */ LF:          10,         // LINE FEED (TODO: Determine if any key actually generates this)
+        /* 0x0D */ CR:          13,         // CARRIAGE RETURN
         /* 0x10 */ SHIFT:       16,
         /* 0x11 */ CTRL:        17,
         /* 0x12 */ ALT:         18,