diff --git a/modules/pdp11/lib/computer.js b/modules/pdp11/lib/computer.js
index 3d983268f..8f32226d5 100644
--- a/modules/pdp11/lib/computer.js
+++ b/modules/pdp11/lib/computer.js
@@ -1067,8 +1067,8 @@ ComputerPDP11.prototype.updateDisplays = function(nUpdate)
      * nUpdate will also be -1 whenever the Debugger has modified the state of the machine, implying that we're
      * not sure what, if anything, actually changed.
      */
-    if (this.cpu) this.cpu.updateDisplay(nUpdate);
-    if (this.panel) this.panel.updateDisplay(nUpdate);
+    if (this.cpu) this.cpu.updateDisplay(nUpdate || 0);
+    if (this.panel) this.panel.updateDisplay(nUpdate || 0);
 };
 
 /**
diff --git a/modules/pdp11/lib/cpu.js b/modules/pdp11/lib/cpu.js
index a1019234a..99273f47f 100644
--- a/modules/pdp11/lib/cpu.js
+++ b/modules/pdp11/lib/cpu.js
@@ -105,6 +105,8 @@ function CPUPDP11(parmsCPU, nCyclesDefault)
 
     var nMultiplier = parmsCPU['multiplier'] || 1;
 
+    this.nDisplayCount = 0;
+    this.nDisplayLimit = 30;
     this.nCyclesPerSecond = nCycles;
 
     /*
@@ -525,12 +527,17 @@ CPUPDP11.prototype.updateDisplays = function(nUpdate)
  * However, this should be called via the Computer's updateDisplays() interface, not directly.
  *
  * @this {CPUPDP11}
- * @param {number} [nUpdate] (1 for periodic, -1 for forced, 0 or undefined otherwise)
+ * @param {number} [nUpdate] (1 for periodic, -1 for forced, 0 otherwise)
  */
 CPUPDP11.prototype.updateDisplay = function(nUpdate)
 {
     var controlSpeed = this.bindings["speed"];
-    if (controlSpeed) controlSpeed.textContent = this.getSpeedCurrent();
+    if (controlSpeed) {
+        if (nUpdate <= 0 || (this.nDisplayCount += nUpdate) >= this.nDisplayLimit) {
+            controlSpeed.textContent = this.getSpeedCurrent();
+            this.nDisplayCount = 0;
+        }
+    }
 };
 
 /**
@@ -684,7 +691,7 @@ CPUPDP11.prototype.getSpeedCurrent = function()
     /*
      * TODO: Has toFixed() been "fixed" in all browsers (eg, IE) to return a rounded value now?
      */
-    return ((this.flags.running && this.mhz)? (this.mhz.toFixed(2) + "Mhz") : "Stopped");
+    return ((this.flags.running)? (this.mhz.toFixed(2) + "Mhz") : "Stopped");
 };
 
 /**
diff --git a/modules/pdp11/lib/panel.js b/modules/pdp11/lib/panel.js
index 7d7c6da7f..175a23620 100644
--- a/modules/pdp11/lib/panel.js
+++ b/modules/pdp11/lib/panel.js
@@ -60,8 +60,8 @@ function PanelPDP11(parmsPanel)
      * TODO: Add some UI for fDisplayLiveRegs (either an XML property, or a UI checkbox, or both).
      */
     this.cLiveRegs = 0;
-    this.nPeriodicCount = 0;
-    this.nPeriodicLimit = 60;
+    this.nDisplayCount = 0;
+    this.nDisplayLimit = 60;
     this.fDisplayLiveRegs = true;
 
     /*
@@ -968,7 +968,7 @@ PanelPDP11.prototype.setData = function(value, fActive)
  * Called by the Computer component at intervals to update registers, LEDs, etc.
  *
  * @this {PanelPDP11}
- * @param {number} [nUpdate] (< 0 for forced, > 0 for periodic, undefined otherwise)
+ * @param {number} [nUpdate] (< 0 for forced, > 0 for periodic, 0 otherwise)
  */
 PanelPDP11.prototype.updateDisplay = function(nUpdate)
 {
@@ -985,7 +985,7 @@ PanelPDP11.prototype.updateDisplay = function(nUpdate)
              * LEDs are considered cheap, register displays are not.  So we'll skip the latter if this
              * is a periodic update AND our periodic update counter hasn't reached the periodic update limit.
              */
-            if (!(nUpdate > 0 && (this.nPeriodicCount += nUpdate) < this.nPeriodicLimit)) {
+            if (nUpdate <= 0 || (this.nDisplayCount += nUpdate) >= this.nDisplayLimit) {
                 for (var i = 0; i < this.cpu.regsGen.length; i++) {
                     this.displayValue('R'+i, this.cpu.regsGen[i]);
                 }
@@ -995,7 +995,7 @@ PanelPDP11.prototype.updateDisplay = function(nUpdate)
                 this.displayValue("ZF", (regPSW & PDP11.PSW.ZF)? 1 : 0, 1);
                 this.displayValue("VF", (regPSW & PDP11.PSW.VF)? 1 : 0, 1);
                 this.displayValue("CF", (regPSW & PDP11.PSW.CF)? 1 : 0, 1);
-                this.nPeriodicCount = 0;
+                this.nDisplayCount = 0;
             }
 
             /*
diff --git a/versions/pdpjs/1.30.3/pdp11-dbg.js b/versions/pdpjs/1.30.3/pdp11-dbg.js
index a9aa7a6b2..1749bc528 100644
--- a/versions/pdpjs/1.30.3/pdp11-dbg.js
+++ b/versions/pdpjs/1.30.3/pdp11-dbg.js
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+k.stop=function(a,b){if(this.w.W){this.w.W=!1;this.J=b-this.Gb;if(!this.S){b="stopped";if(this.J){a-=this.Fb;var c=0<a?Math.round(1E3*this.J/a):0;b+=" (";we(this)&&(b+=this.wa+" instructions, ",this.wa=0);b+=this.J+" cycles, "+a+" ms, "+c+" hz)"}else F(this,-2147483648)&&(b+=" (use the 't' command to execute blocked faults)");this.j(b)}qd(this,!0);this.sb();ji(this,this.b.u[7]);this.ia=null}};function we(a){return 1<a.f.length||!!a.ta}
+function xe(a,b,c){var d=-1;c||(d=a.b.cb(b),0==d&&(b=Fd(a.b,2)));if(0<c&&(a.ta&&!--a.ta||id(a,b,1,a.f)))return!0;0<=c&&a.H.length&&(a.wa++,0>d&&(d=a.b.cb(b)),65535!=(d&65535)&&(a.kc(a.H[a.$],b),++a.$==a.H.length&&(a.$=0)));return!1}function Cf(a){var b=a.b;if(b.w.W)throw O(b,a.b.Jb),a.da(),-1;return!1}
 function Sh(a){var b,c;a.f=["bp"];if(a.M)for(b=1;b<a.M.length;b++){c=a.M[b];var d=a.v;c=a.ba(c);jd(d.Y[c>>>d.ja],!1)}a.M=["br"];if(a.D)for(b=1;b<a.D.length;b++)c=a.D[b],d=a.v,c=a.ba(c),jd(d.Y[c>>>d.ja],!0);a.D=["bw"];a.lb=0}k.mb=function(a,b,c){var d=!0;c||ki(this,a,b,!1,!0);if(a!=this.f){var e=this.ba(b);if(-1===e)this.j("invalid address: "+J(this,b.F)),d=!1;else{var f=this.v;f.Y[e>>>f.ja].mb(e&f.v,a==this.D)}}d&&(a.push(b),c?b.Oa=!0:(li(this,a,a.length-1,"set"),Th(this)));return d};
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+function ki(a,b,c,d,e){var f=!1;c=a.ba(c);for(var g=1;g<b.length;g++){var h=b[g];if(c==a.ba(h)&&(!d||h.Oa)){f=!0;h.Oa||e||li(a,b,g,"cleared");b.splice(g,1);b!=a.f&&(d=a.v,jd(d.Y[c>>>d.ja],b==a.D));h.Oa||Th(a);break}}return f}function mi(a,b){for(var c=1;c<b.length;c++)li(a,b,c);return b.length-1}function li(a,b,c,d){c=b[c];a.j(b[0]+" "+J(a,c.F)+(d?" "+d:c.Ic?' "'+c.Ic+'"':""))}
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+function id(a,b,c,d,e){var f=!1;if(!a.lb++)for(var g=1;!f&&g<d.length;g++){var h=d[g];if(!e||h.Oa)for(var l=a.ba(h)&65535,m=0;m<c;m++)if(b+m==l){var n,f=!0;h.Oa&&(ki(a,d,h,!0),e=!0);if(n=h.Nc){for(var f=!1,v=0;v<n.length;v++)if(!ni(a,n[v],!0)){if(n[v].indexOf("if")){f=!0;break}for(var r=v+1;r<n.length&&n[r].indexOf("else");r++)v++;if(r==n.length){f=!0;break}}a.b.w.W||(f=!0)}if(f){e||li(a,d,g,"hit");break}}}a.lb--;return f}
 function oi(a,b,c,d){var e=Y(b.F),f=a.na(b,2),g,h;for(h in a.ob)if(g=a.ob[h][f&h])break;g||(g=Yh);var l=g[0];0<=a.Eb.indexOf(l)&&(g=Yh,l=g[0]);var m=h="",n=Wh[l],v=g.length-1;l||v||(h=J(a,f));for(l=1;l<=v;l++){var r=g[l];if(void 0!==r){var w;w=a;var y=r,r=b,x="",C=y&61440;if(4096==C)r=r.F+((f&255)<<24>>23)&65535,x=J(w,r);else if(8192==C)r=r.F-((f&63)<<1)&65535,x=J(w,r);else if(12288==C)x=J(w,f&7,1);else if(24576==C)x=J(w,f&63,1);else if(32768==C)x=J(w,f&255,1);else if(C=f&y,y&4032&&(C>>=6,y>>=6),
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+0<h.length&&(h+=",");h+=w||"???"}}f="";g=J(a,e.F)+":";if(-1!==e.F&&-1!==b.F){do if(f+=" "+J(a,a.na(e,2)),null==e.F)break;while(e.F!=b.F)}g+=wa(f,24);g+=wa(n,5);h&&(g+=" "+h);if(c||m)g=wa(g,60)+";"+(c||""),g=a.b.w.ub?g+("cycles="+sd(a.b).toString()+" cs="+p(a.b.Lb)):g+(null!=d?"="+d.toString():""),m&&(g+=" @"+m);return g}function pi(a,b){switch(b){case "N":a=a.b.Ua();break;case "Z":a=Dd(a.b);break;case "V":a=Cd(a.b);break;case "C":a=Bd(a.b);break;default:a=0}return b.charAt(0)+(a?"1":"0")+" "}
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-function Tg(a,b,c,d,e){var f=[],g;for(g in e){var h=e[g];"number"==typeof h&&(e[g]=h={o:h});var l=h.o,m=h.a;if(void 0!==l){var n=f,l=[l>>>0,g],v=za(n,l,a.pc);0>v&&n.splice(-(v+1),0,l)}m&&(h.a=m.replace(/''/g,'"'))}a.I.push({Ze:b,F:c,Wc:d,ga:e,nc:f})}function si(a,b,c){var d=[],e=a.ba(b)>>>0;for(b=0;b<a.I.length;b++){var f=a.I[b],g=f.F>>>0,h=f.Wc;if(e>=g&&e<g+h){e=za(f.nc,[e-g],a.pc);0<=e?ti(a,b,e,d):c&&(e=~e,ti(a,b,e-1,d),ti(a,b,e,d));break}}return d}
+function Tg(a,b,c,d,e){var f=[],g;for(g in e){var h=e[g];"number"==typeof h&&(e[g]=h={o:h});var l=h.o,m=h.a;if(void 0!==l){var n=f,l=[l>>>0,g],v=za(n,l,a.pc);0>v&&n.splice(-(v+1),0,l)}m&&(h.a=m.replace(/''/g,'"'))}a.I.push({$e:b,F:c,Xc:d,ga:e,nc:f})}function si(a,b,c){var d=[],e=a.ba(b)>>>0;for(b=0;b<a.I.length;b++){var f=a.I[b],g=f.F>>>0,h=f.Xc;if(e>=g&&e<g+h){e=za(f.nc,[e-g],a.pc);0<=e?ti(a,b,e,d):c&&(e=~e,ti(a,b,e-1,d),ti(a,b,e,d));break}}return d}
 function ti(a,b,c,d){var e={},f=a.I[b].nc,g=0,h=null;0<=c&&c<f.length&&(g=f[c][0],h=f[c][1]);h&&(e=a.I[b].ga[h],h="."==h.charAt(0)?null:e.l||h);d.push(h);d.push(g);d.push(e.a);d.push(e.c)}function ui(a,b){var c=b.match(/^\s*([A-Z_]?[A-Z0-9_]*)\s*(=?)\s*(.*)$/i);if(c){if(!c[1])return Qh(a)||a.j("no variables"),!0;if(!c[2])return Qh(a,c[1]);if(!c[3])return delete a.X[c[1]],!0;b=Mh(a,c[3]);return void 0!==b?(a.X[c[1]]=b,!0):!1}a.j("invalid assignment:"+b);return!1}
 function vi(a,b,c){var d=null;if(b=ai(a,b,!0)){a.ba(b);var e=si(a,b,!0);if(e.length){var f,g;e[0]&&(g="",(f=b.F-e[1])&&(g=" + "+p(f,4,!0)),f=e[0]+" ("+J(a,e[1])+")"+g,c&&a.j(f),d=f);4<e.length&&e[4]&&(g="",(f=e[5]-b.F)&&(g=" - "+p(f,4,!0)),f=e[4]+" ("+J(a,e[5])+")"+g,c&&a.j(f),d||(d=f))}else c&&a.j("no symbols")}return d}
 function hi(a,b){var c;if(b&&"?"==b[1])a.j("register commands:"),a.j("\tr\tdump registers"),a.j("\trx [#]\tset flag or register x to [#]");else{var d=a.b;null==c&&(c=!0);if(b&&1<b.length){var e=b[1],f=e.indexOf("=");if(0<f)b=e.substr(f+1),e=e.substr(0,f);else if(2<b.length)b=b[2];else{a.j("missing value for "+b[1]);return}f=Mh(a,b);if(void 0===f)return;b=e.toUpperCase();switch(b){case "SP":case "R6":d.u[6]=f&65535;break;case "PC":case "R7":O(d,f);a.L=Y(d.u[7]);break;case "N":d.Z=f?32768:0;break;case "Z":d.aa=
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 function ii(a,b,c,d){if(b=ai(a,b,!0)){void 0===d&&(d=1);var e=256;if(void 0!==c)if("l"==c.charAt(0))c=Oh(a,c.substr(1)),null!=c&&(d=c);else{d=ai(a,c,!0);if(!d||d.F<b.F)return;e=d.F-b.F;if(256<e){a.j("range too large");return}d=-1}c=0;for(var f;0<e&&d--;){f=vb(a,!1)||a.S?a.J:null;var g=null!=f?"cycles":null,h=si(a,b),l=b.F;if(h[0]&&d&&(!c&&d||0>h[0].indexOf("+"))){var m=h[0]+":";h[2]&&(m+=" "+h[2]);a.j(m)}h[3]&&(g=h[3],f=null);f=oi(a,b,g,f);a.j(f);a.L=b;e-=b.F-l;c++}}}
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-a.j("\tbn [n]\tbreak after [n] instruction(s)");else{var ia=y.charAt(1);if("l"==ia){var Ja;Ja=0+mi(a,a.f);Ja+=mi(a,a.M);(Ja+=mi(a,a.D))||a.j("no breakpoints")}else if("n"==ia)a.pa=Oh(a,x),a.j("break after "+a.pa+" instruction(s)");else if(void 0===x)a.j("missing breakpoint address");else{var P=Y();if("*"!=x&&(P=ai(a,x,!0),!P))break a;"c"==ia?null==P.F?(Sh(a),a.j("all breakpoints cleared")):ki(a,a.f,P)||ki(a,a.M,P)||ki(a,a.D,P)||a.j("breakpoint missing: "+J(a,P.F)):null!=P.F&&(ei(a,P,C),"p"==ia?a.mb(a.f,
+a.j("\tbn [n]\tbreak after [n] instruction(s)");else{var ia=y.charAt(1);if("l"==ia){var Ja;Ja=0+mi(a,a.f);Ja+=mi(a,a.M);(Ja+=mi(a,a.D))||a.j("no breakpoints")}else if("n"==ia)a.ta=Oh(a,x),a.j("break after "+a.ta+" instruction(s)");else if(void 0===x)a.j("missing breakpoint address");else{var P=Y();if("*"!=x&&(P=ai(a,x,!0),!P))break a;"c"==ia?null==P.F?(Sh(a),a.j("all breakpoints cleared")):ki(a,a.f,P)||ki(a,a.M,P)||ki(a,a.D,P)||a.j("breakpoint missing: "+J(a,P.F)):null!=P.F&&(ei(a,P,C),"p"==ia?a.mb(a.f,
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-ib.length&&a.j("dump extension commands:\n\t"+ib)}else if("state"==la){var Bg=yi(a.C,!0);"console"==Ma?console.log(Bg):(a.Sa&&(a.Sa.value=""),a.j(Bg))}else if("symbols"==la)for(var Kd=0;Kd<a.I.length;Kd++){var Ld=a.I[Kd],jb;for(jb in Ld.ga)if("."!=jb.charAt(0)){var Cg=Ld.ga[jb].o;if(void 0!==Cg){var Dg=Ld.ga[jb].l;Dg&&(jb=Dg);a.j(J(a,Cg)+" "+jb)}}}else{if("d"==La){for(hb in Bb)if(g[1]==hb){var Eg=a.Ja[hb];Eg?(g.shift(),g.shift(),Eg(g)):a.j("no dump registered for "+la);break a}la||(La=a.Tb||"dw")}else a.Tb=
+ib.length&&a.j("dump extension commands:\n\t"+ib)}else if("state"==la){var Bg=yi(a.C,!0);"console"==Ma?console.log(Bg):(a.Sa&&(a.Sa.value=""),a.j(Bg))}else if("symbols"==la)for(var Kd=0;Kd<a.I.length;Kd++){var Ld=a.I[Kd],jb;for(jb in Ld.ga)if("."!=jb.charAt(0)){var Cg=Ld.ga[jb].o;if(void 0!==Cg){var Dg=Ld.ga[jb].l;Dg&&(jb=Dg);a.j(J(a,Cg)+" "+jb)}}}else{if("d"==La){for(hb in Bb)if(g[1]==hb){var Eg=a.Ja[hb];Eg?(g.shift(),g.shift(),Eg(g)):a.j("no dump registered for "+la);break a}la||(La=a.Hb||"dw")}else a.Hb=
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-Qb.ac,Pb-=Qb.ac,Z-=Qb.ac);fa>=ma.length&&(fa=0);a.nb=Z;Ig++;Pb--}}Ig||(a.j("no "+Hg+"history available"),a.nb=void 0)}else{var kb=ai(a,la);if(kb){var Rb=0,Nd=!1,Od="ds"==La;Ma&&(Nd=!0,"l"==Ma.charAt(0)&&(Nd=!1,Ma=Ma.substr(1)||Qi),Rb=Oh(a,Ma)>>>0,65536<Rb&&(Rb=65536));for(var lb="dd"==La?4:"db"==La?1:2,Hc=(Nd?Rb-kb.F:lb*Rb)||128,Pd=Od?16:a.ca,Si=(Hc+Pd-1)/Pd|0||1,Na="";Si--&&0<Hc;){for(var Oa="",Qd="",la=J(a,kb.F),Ic=Pd,Sb=0,Tb=0;0<Ic&&0<Hc;){var mb=1,Jc=1==lb?a.Hb(kb,mb):a.na(kb,mb=2),Sb=Sb|Jc<<
-(Tb<<3),Tb=Tb+mb;Tb==lb&&(Od?(Oa&&(Oa+=","),Oa+="0x"+p(Sb,2*lb)):(Oa+=J(a,Sb,lb),Oa+=1==lb?9==Ic?"-":" ":"  "),Sb=Tb=0);Ic-=mb;for(Hc-=mb;mb--;)var Rd=Jc&255,Qd=Qd+(32<=Rd&&128>Rd?String.fromCharCode(Rd):"."),Jc=Jc>>8}Na&&(Na+="\n");Na=Od?Na+(Oa+","):Na+(la+"  "+Oa+(0==Ic?" "+Qd:""))}Na&&a.j(Na);a.kb=kb}}}}break;case "e":if("else"==g[0])break;var nb,Sd,Td,Ud,Vd=g[0],Wd=g[1];"eb"==Vd?(nb=1,Sd=255,Td=a.Hb,Ud=a.Ab):"e"==Vd||"ew"==Vd?(nb=2,Sd=65535,Td=a.na,Ud=a.gb):Wd=null;if(null==Wd)a.j("edit memory commands:"),
+Qb.ac,Pb-=Qb.ac,Z-=Qb.ac);fa>=ma.length&&(fa=0);a.nb=Z;Ig++;Pb--}}Ig||(a.j("no "+Hg+"history available"),a.nb=void 0)}else{var kb=ai(a,la);if(kb){var Rb=0,Nd=!1,Od="ds"==La;Ma&&(Nd=!0,"l"==Ma.charAt(0)&&(Nd=!1,Ma=Ma.substr(1)||Qi),Rb=Oh(a,Ma)>>>0,65536<Rb&&(Rb=65536));for(var lb="dd"==La?4:"db"==La?1:2,Hc=(Nd?Rb-kb.F:lb*Rb)||128,Pd=Od?16:a.ca,Si=(Hc+Pd-1)/Pd|0||1,Na="";Si--&&0<Hc;){for(var Oa="",Qd="",la=J(a,kb.F),Ic=Pd,Sb=0,Tb=0;0<Ic&&0<Hc;){var mb=1,Jc=1==lb?a.Ib(kb,mb):a.na(kb,mb=2),Sb=Sb|Jc<<
+(Tb<<3),Tb=Tb+mb;Tb==lb&&(Od?(Oa&&(Oa+=","),Oa+="0x"+p(Sb,2*lb)):(Oa+=J(a,Sb,lb),Oa+=1==lb?9==Ic?"-":" ":"  "),Sb=Tb=0);Ic-=mb;for(Hc-=mb;mb--;)var Rd=Jc&255,Qd=Qd+(32<=Rd&&128>Rd?String.fromCharCode(Rd):"."),Jc=Jc>>8}Na&&(Na+="\n");Na=Od?Na+(Oa+","):Na+(la+"  "+Oa+(0==Ic?" "+Qd:""))}Na&&a.j(Na);a.kb=kb}}}}break;case "e":if("else"==g[0])break;var nb,Sd,Td,Ud,Vd=g[0],Wd=g[1];"eb"==Vd?(nb=1,Sd=255,Td=a.Ib,Ud=a.Ab):"e"==Vd||"ew"==Vd?(nb=2,Sd=65535,Td=a.na,Ud=a.gb):Wd=null;if(null==Wd)a.j("edit memory commands:"),
 a.j("\teb [a] [...]  edit bytes at address a"),a.j("\tew [a] [...]  edit words at address a");else{var Kc=ai(a,Wd);if(Kc)for(var Lc=2;Lc<g.length;Lc++){var Ub=Mh(a,g[Lc]);if(void 0===Ub){a.j("unrecognized value: "+g[Lc]);break}Ub&~Sd&&a.j("warning: "+p(Ub)+" exceeds "+nb+"-byte value");a.j("changing "+J(a,Kc.F)+(F(a,64)?"":" from "+J(a,Td.call(a,Kc),nb))+" to "+J(a,Ub,nb));Ud.call(a,Kc,Ub,nb)}}break;case "g":a:{var Lg=g[1],Ti=b;if(void 0!==Lg){var Xd=ai(a,Lg,!0);if(!Xd)break a;ei(a,Xd,Ti);a.mb(a.f,
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-a.va=[]}}var Xi=0,Yb="";for(na in Bb)if(!G||G==na){var Yi=!!(a.ma&Bb[na]);if(null===oa||oa==Yi)Yb&&(Yb+=","),++Xi%10||(Yb+="\n\t"),"key"==na&&(na="keys"),Yb+=na}void 0===G&&a.j("message commands:\n\tm [category] [on|off]\tturn categories on/off");a.j((null!==oa?oa?"messages on:  ":"messages off: ":"message categories:\n\t")+(Yb||"none"));Th(a)}break;case "p":if("print"==g[0]){wi(a,b.substr(5));break}var Zi="pr"==g[0]?1:0;if(a.S)a.j("step in progress");else{var Rg=Y(a.b.u[7]);a.Hb(Rg);a.S?(a.mb(a.f,
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+a.va=[]}}var Xi=0,Yb="";for(na in Bb)if(!G||G==na){var Yi=!!(a.ma&Bb[na]);if(null===oa||oa==Yi)Yb&&(Yb+=","),++Xi%10||(Yb+="\n\t"),"key"==na&&(na="keys"),Yb+=na}void 0===G&&a.j("message commands:\n\tm [category] [on|off]\tturn categories on/off");a.j((null!==oa?oa?"messages on:  ":"messages off: ":"message categories:\n\t")+(Yb||"none"));Th(a)}break;case "p":if("print"==g[0]){wi(a,b.substr(5));break}var Zi="pr"==g[0]?1:0;if(a.S)a.j("step in progress");else{var Rg=Y(a.b.u[7]);a.Ib(Rg);a.S?(a.mb(a.f,
+Rg,!0),a.hb()||(a.C&&a.C.sb(),a.S=0)):xi(a,Zi?"tr":"t")}break;case "r":if("reset"==b){a.C&&a.C.reset();break}hi(a,g);break;case "s":a:switch(g[1]){case "base":if(g[2]){var Zb=+g[2];if(8==Zb||10==Zb||16==Zb)a.ca=Zb;else{a.j("invalid base: "+Zb);break}}a.j("default base: "+a.ca);break;case "cs":var $b;void 0!==g[3]&&($b=+g[3]);switch(g[2]){case "int":a.b.vb=$b;break;case "start":a.b.Mb=$b;break;case "stop":a.b.wb=$b;break;default:a.j("unknown cs option");break a}void 0!==$b&&pd(a.b);a.j("checksums "+
 (a.b.w.ub?"enabled":"disabled"));break;case "sp":void 0!==g[2]&&(td(a.b,+g[2])||a.j("warning: using 1x multiplier, previous target not reached"));a.j("target speed: "+(a.b.pb.toFixed(2)+"Mhz")+" ("+a.b.eb+"x)");break;default:if(g[1]){a.j("unknown option: "+g[1]);break}case "?":a.j("debugger options:"),a.j("\tbase #\t\tset default base to #"),a.j("\tcs int #\tset checksum cycle interval to #"),a.j("\tcs start #\tset checksum cycle start count to #"),a.j("\tcs stop #\tset checksum cycle stop count to #"),
 a.j("\tsp #\t\tset speed multiplier to #")}break;case "t":xi(a,g[0],g[1]);break;case "u":ii(a,g[1],g[2],8);break;case "v":if("var"==g[0]){ui(a,b.substr(3))||(d=!1);break}if("ver"==g[0]){a.j("PDPjs version 1.30.3 ("+a.b.Wa+",RELEASE"+(zb?",TYPEDARRAYS":",LONGARRAYS")+")");a.j(window?window.navigator.userAgent:"");break}f=!0;break;case "?":if(g[1]){wi(a,b.substr(1));break}var ce="commands:",de;for(de in Vh)ce+="\n"+wa(de,9)+Vh[de];we(a)||(ce+="\nnote: history disabled if no exec breakpoints");a.j(ce);
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 function zi(a,b,c){t.call(this,"Computer",a,zi,67108864);this.w.ha=!1;Ai(this,b);this.L=nd(this,"autoPower",a);this.C=0;this.X=a.busWidth||a.buswidth;this.f=Bi;this.I=null;this.D=this.R=!1;this.$=nd(this,"url")||"";(Math.random()+.1).toString(36);this.g=Ci(this);if(this.b=tb("CPU",this.id)){this.i=tb("Debugger",this.id);this.v=new mc({id:this.Qa+".bus",busWidth:this.X},this.b,this.i);var d,e=rb(this.id);if((this.B=tb("Panel",this.id))&&this.B.Sa)for(b=0;b<e.length;b++)d=e[b],d.P=this.B.P,d.j=this.B.j,
 d.Sa=this.B.Sa;this.j("PDPjs v1.30.3\nCopyright \u00a9 2012-2016 Jeff Parsons <Jeff@pcjs.org>\nLicense: GPL version 3 or later <http://gnu.org/licenses/gpl.html>");this.j("Portions adapted from the PDP-11/70 Emulator v1.4 by Paul Nankervis <paulnank@hotmail.com>");for(b=0;b<e.length;b++)d=e[b],d.Ea&&d.Ea(this,this.v,this.b,this.i);b=null;d=a.resume;void 0!==d&&(1<d.length?b=this.H=d:this.f=parseInt(d,10));var f;if(a=nd(this,"state")||(f=!0,a.state))b=this.M=a,f||(this.D=!0,this.f=Bi),this.f&&(this.J=
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+new N(this,"1.30.3"),Di(this.J)?b=null:delete this.J);!b&&this.f&&(b=Ei(this))&&(this.D=!0);if(b){var g=this;Da(b,null,!0,function(a,b,c){c?(g.H=null,g.D=!1,g.P("Unable to load machine state from server (error "+c+(b?": "+xa(b):"")+")")):(g.I=b,g.R=!0);H(g)})}else H(this);this.G.power||(this.L=!0);!c&&this.L&&Fi(this,this.Nb)}else q("Unable to find CPU component")}z(zi);var Bi=0;
 function Ai(a,b){if(!b){var c;if("object"==typeof resources&&(c=resources.parms))try{b=eval("("+c+")")}catch(d){q(d.message+" ("+c+")")}}a.S=b}function nd(a,b,c){var d=b.toLowerCase(),d=db[b]||db[d];void 0===d&&a.S&&(d=a.S[b]);void 0===d&&c&&(d=c[b]);void 0===d&&"object"==typeof resources&&resources[b]&&(d=b);return d}function Fi(a,b,c){for(var d=rb(a.id),e=0;e<=d.length;e++){var f=e<d.length?d[e]:a;if(!wb(f)){wb(f,function(){Fi(a,b,c)});return}}b.call(a,c)}
 function Gi(a,b){var c=new N(a,"1.30.3","validate");if(Di(c)&&Hi(c)){var d=c.get("timestamp"),e=b?b.get("timestamp"):"unknown";d!=e&&(a.P("Machine state may be out-of-date\n("+d+" vs. "+e+")\nCheck your browser's local storage limits"),b||c.clear())}}k=zi.prototype;
-k.Mb=function(a){void 0===a&&(a=this.f||(this.I?1:Bi));if(!this.C){this.C++;var b=!1,c=!1;this.O=!1;var d=this.J||new N(this,"1.30.3");if(-1==a)b=!0;else if(a>Bi){if(Di(d,this.I)){this.A=new N(this,"1.30.3","failsafe");Di(this.A)&&(Ii(this,d),a=2,Ji(this.A));this.A.set("timestamp",Ba());Ki(this.A);var e=this.f&&!this.D;if(1==a||Ga("Click OK to restore the previous PDPjs machine state, or CANCEL to reset the machine.")){if(c=Hi(d)){var f=d.get("code"),g=d.get("data");f&&("ok"==f?Di(d,g):("error"==
+k.Nb=function(a){void 0===a&&(a=this.f||(this.I?1:Bi));if(!this.C){this.C++;var b=!1,c=!1;this.O=!1;var d=this.J||new N(this,"1.30.3");if(-1==a)b=!0;else if(a>Bi){if(Di(d,this.I)){this.A=new N(this,"1.30.3","failsafe");Di(this.A)&&(Ii(this,d),a=2,Ji(this.A));this.A.set("timestamp",Ba());Ki(this.A);var e=this.f&&!this.D;if(1==a||Ga("Click OK to restore the previous PDPjs machine state, or CANCEL to reset the machine.")){if(c=Hi(d)){var f=d.get("code"),g=d.get("data");f&&("ok"==f?Di(d,g):("error"==
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-function Li(a,b,c,d,e){if(!b.w.ha){b.w.ha=!0;if(b.Ga){var f=null;e&&((f=c.get(b.id))||(f=c.get(b.id.replace(/[a-z0-9]\./i,"."))));"string"===typeof f&&(f=null);!b.Ga(f,d)&&f&&(q("Unable to restore state for "+b.type),a.M&&!a.R?(c.clear(),a.f=Bi,window&&window.location.reload()):a.O=!0,b.Ga(null),e=!1)}if(!d&&b.vc)for(a=b.vc.split("|"),c=0;c<a.length;c++)b.status(a[c])}return e}
+function Li(a,b,c,d,e){if(!b.w.ha){b.w.ha=!0;if(b.Ga){var f=null;e&&((f=c.get(b.id))||(f=c.get(b.id.replace(/[a-z0-9]\./i,"."))));"string"===typeof f&&(f=null);!b.Ga(f,d)&&f&&(q("Unable to restore state for "+b.type),a.M&&!a.R?(c.clear(),a.f=Bi,window&&window.location.reload()):a.O=!0,b.Ga(null),e=!1)}if(!d&&b.wc)for(a=b.wc.split("|"),c=0;c<a.length;c++)b.status(a[c])}return e}
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 h.restore=function(a){var b=0,c="unsupported restore format";if(a&&0<a.length){var d=0,e=a[d++];e&&2<=e.length&&(!this.a.length&&6<=e.length?Bf(this,"local",e[2],e[3],e[4],e[5]):null!=e[1]&&null!=this.b&&e[1]!=this.b&&(c="original checksum ("+e[1]+") differs from current checksum ("+this.b+")",b=-2));for(this.a.length||(b=-1);d<a.length&&0<=b;){var f=0,g=a[d++],k=g[f++],l=g[f++],n=g[f++];if(k>=this.a.length||l>=this.a[k].length||n>=this.a[k][l].length){c="sector (CHS="+k+":"+l+":"+n+") out of range ("+
-b+" changes applied)";b=-1;break}if(this.c){c="unable to modify write-protected disk";b=-1;break}e=g[f++];f=g[f++];g=e+f.length;if(k=this.a[k][l][n]){for(l=k.data.length;l<e;)k.data[l++]=k.pattern;l=0;k.ma=e;for(k.ba=f.length;e<g;)k.data[e++]=f[l++];b++}}}0>b&&-2!=b&&this.controller.G("Unable to restore disk '"+this.xa+": "+c);return b};
+b+" changes applied)";b=-1;break}if(this.c){c="unable to modify write-protected disk";b=-1;break}e=g[f++];f=g[f++];g=e+f.length;if(k=this.a[k][l][n]){for(l=k.data.length;l<e;)k.data[l++]=k.pattern;l=0;k.ma=e;for(k.ba=f.length;e<g;)k.data[e++]=f[l++];b++}}}0>b&&-2!=b&&this.controller.G("Unable to restore disk '"+this.wa+": "+c);return b};
 h.toJSON=function(){var a;a=0;for(var b;b=Gf(this,a++);)If(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 If(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 N(a){x.call(this,"RL11",a,N);this.g=a.autoMount||null;this.s=0;this.b=Array(4);this.A=!Aa("Mobi")&&window&&"FileReader"in window}z(N);h=N.prototype;
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@@ -196,41 +196,42 @@ c,c.onclick=function(){var a=d.o.listDisks;a&&Kf(d,a.options[a.selectedIndex].te
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 h.ia=function(a,b,c,d){this.l=a;this.h=b;this.a=c;this.D=d;if((this.g=sc(this.l,"autoMount")||this.g)&&"string"==typeof this.g)try{this.g=eval("("+this.g+")")}catch(e){t("RL11 auto-mount error: "+e.message+" ("+this.g+")"),this.g=null}Lf(this);this.F=Vb(112,5);cb(b,this,Mf,4194304);eb(b,this.reset.bind(this));Nf(this,"None","",!0);this.A&&Nf(this,"Local Disk","?");Nf(this,"Remote Disk","??");Of(this)||F(this)};
-h.ka=function(a,b){if(!b){if(!a||!this.restore){if(this.reset(),this.l.Lb){for(a=0;a<this.b.length;a++)Pf(this,a,!0);Of(this,!0)}}else if(!this.restore(a))return!1;if(a=this.o.listDrives){for(;a.firstChild;)a.removeChild(a.firstChild);a.value="";for(b=0;4>b;b++){var c=document.createElement("option");c.value=b;c.text="RL"+b;a.appendChild(c)}a.value="0";Jf(this,0)}}return!0};h.ja=function(a){return a?this.save():!0};h.reset=function(){Lf(this)};h.save=function(){return(new O(this)).data()};
+h.ka=function(a,b){if(!b){if(!a||!this.restore){if(this.reset(),this.l.Mb){for(a=0;a<this.b.length;a++)Pf(this,a,!0);Of(this,!0)}}else if(!this.restore(a))return!1;if(a=this.o.listDrives){for(;a.firstChild;)a.removeChild(a.firstChild);a.value="";for(b=0;4>b;b++){var c=document.createElement("option");c.value=b;c.text="RL"+b;a.appendChild(c)}a.value="0";Jf(this,0)}}return!0};h.ja=function(a){return a?this.save():!0};h.reset=function(){Lf(this)};h.save=function(){return(new O(this)).data()};
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-h.kc=function(a,b,c,d,e){var f;a.vb=!1;b&&(f=b.a.length?[b.a.length,b.a[0].length,b.a[0][0].length,b.a[0][0][0].length]:[0,0,0,0],b&&f[0]>a.U||f[1]>a.Y)&&(this.G('Disk "'+c+'" too large for drive '+("RL"+a.yb)),b=null);b?(a.ca=b,a.xa=c,a.Ca=d,this.G('Mounted disk "'+c+'" in drive '+("RL"+a.yb),a.ub||e),this.l&&yc(this.l)):a.ib=!1;a.ub&&(a.ub=!1,--this.s||F(this));Jf(this,a.yb)};
+function Qf(a,b,c,d,e,f){var g=-1,k=a.b[b];k.Ca.toLowerCase()!=d.toLowerCase()&&(g++,Pf(a,b,!0),k.vb?a.G("RL11 busy"):(k.vb=!0,e&&(k.ub=!0,a.s++),k.ib=!!f,Df(new zf(a,k,"preload"),c,d,f,a.lc)&&g++));return g}
+h.lc=function(a,b,c,d,e){var f;a.vb=!1;b&&(f=b.a.length?[b.a.length,b.a[0].length,b.a[0][0].length,b.a[0][0][0].length]:[0,0,0,0],b&&f[0]>a.U||f[1]>a.Y)&&(this.G('Disk "'+c+'" too large for drive '+("RL"+a.yb)),b=null);b?(a.ca=b,a.wa=c,a.Ca=d,this.G('Mounted disk "'+c+'" in drive '+("RL"+a.yb),a.ub||e),this.l&&yc(this.l)):a.ib=!1;a.ub&&(a.ub=!1,--this.s||F(this));Jf(this,a.yb)};
 function Nf(a,b,c,d){if((a=a.o.listDisks)&&a.options){for(var e=0;e<a.options.length;e++)if(a.options[e].value==c)return;e=document.createElement("option");e.text=b;e.value=c;d&&a.childNodes[0]?a.insertBefore(e,a.childNodes[0]):a.appendChild(e)}}
-function Jf(a,b){if(0<=b&&b<a.b.length){var c=a.b[b],d=a.o.listDisks;a=a.o.listDrives;if(d&&a&&d.options&&a.options&&(a=ja(a.value),c=c.ib?"?":c.Ca,!isNaN(a)&&a==b)){for(b=0;b<d.options.length;b++)if(d.options[b].value==c){d.selectedIndex!=b&&(d.selectedIndex=b);break}b==d.options.length&&(d.selectedIndex=0)}}}function Pf(a,b,c){var d=a.b[b];if(d.ca||!1===c)d.xa="",d.Ca="",d.ca=null,d.ib=!1,c||(a.G("Drive RL"+b+" unloaded",c),Jf(a,b))}
-function Lf(a,b){var c=0;b||(b=[]);a.L=b[c++]||0;a.v=b[c++]||0;a.c=b[c++]||0;a.i=b[c++]||0;a.m=b[c++]||0;a.w=b[c]||0;for(b=0;b<a.b.length;b++){var d=a.b[b];void 0===d&&(d=a.b[b]={});c=a;d.yb=b;d.vb=d.ib=!1;d.name=c.Ha;d.U=512;d.Y=2;d.S=40;d.ha=256;d.wb=!0;d.je=0;d.ie=0;d.Jb=1;d.hc=d.S;d.Qb=d.ha;d.me=0;d.ne=null;d.ca||(d.Ca="");d.status=29|(512==d.U?128:0)}return!0}
-h.ic=function(a,b,c,d,e,f){this.v=f&65535;this.L=this.L&-49|f>>12&48;this.w=f>>16&63;this.i=this.c=b<<7|(c?64:0)|d&63;this.m=65536-e&65535;a&&(this.L=this.L|a|32768);return!0};
-h.zc=function(a,b,c,d,e,f,g){var k=0,l=a.ca,n=null,p;l||(k=5120,e=0);for(;e--;){if(!n){n=a.ca.seek(b,c,d+1);if(!n){k=5120;break}p=0}var u,w;if(0>(u=a.ca.read(n,p++))||0>(w=a.ca.read(n,p++))){k=5120;break}Ob(this.h,f,u|w<<8);if(Rb(this.h)){k=8192;break}f+=2;if(p>=l.ha&&(n=null,++d>=l.S&&(d=0,++c>=l.Y&&(c=0,++b>=l.U)))){k=5120;break}}return g(k,b,c,d,e,f)};
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+function Jf(a,b){if(0<=b&&b<a.b.length){var c=a.b[b],d=a.o.listDisks;a=a.o.listDrives;if(d&&a&&d.options&&a.options&&(a=ja(a.value),c=c.ib?"?":c.Ca,!isNaN(a)&&a==b)){for(b=0;b<d.options.length;b++)if(d.options[b].value==c){d.selectedIndex!=b&&(d.selectedIndex=b);break}b==d.options.length&&(d.selectedIndex=0)}}}function Pf(a,b,c){var d=a.b[b];if(d.ca||!1===c)d.wa="",d.Ca="",d.ca=null,d.ib=!1,c||(a.G("Drive RL"+b+" unloaded",c),Jf(a,b))}
+function Lf(a,b){var c=0;b||(b=[]);a.L=b[c++]||0;a.v=b[c++]||0;a.c=b[c++]||0;a.i=b[c++]||0;a.m=b[c++]||0;a.w=b[c]||0;for(b=0;b<a.b.length;b++){var d=a.b[b];void 0===d&&(d=a.b[b]={});c=a;d.yb=b;d.vb=d.ib=!1;d.name=c.ya;d.U=512;d.Y=2;d.S=40;d.ha=256;d.wb=!0;d.ke=0;d.je=0;d.Kb=1;d.ic=d.S;d.Qb=d.ha;d.ne=0;d.oe=null;d.ca||(d.Ca="");d.status=29|(512==d.U?128:0)}return!0}
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