diff --git a/modules/pdp11/lib/bus.js b/modules/pdp11/lib/bus.js
index 851895c81..a39b61a1b 100644
--- a/modules/pdp11/lib/bus.js
+++ b/modules/pdp11/lib/bus.js
@@ -80,8 +80,8 @@ function BusPDP11(parmsBus, cpu, dbg)
      * It is managed by setIOPageRange().  reset() establishes the default (16).
      */
     this.nIOPageRange = 0;                  // zero means no IOPAGE access (yet)
-    this.prevIOPageBlocks = [];             // this saves any memory blocks we had to replace with IOPAGE blocks
-    this.realIOPageBlocks = null;           // this saves the memory blocks allocated for IOPAGE, so we can reuse them
+    this.aIOPrevBlocks = [];                // this saves any previous blocks we had to replace with IOPAGE blocks
+    this.aIOPageBlocks = null;              // this saves the memory blocks allocated for IOPAGE, so we can reuse them
 
     /*
      * Compute all BusPDP11 memory block parameters now, based on the width of the bus.
@@ -452,7 +452,7 @@ BusPDP11.prototype.setIOPageRange = function(nRange)
         var addr;
         if (this.nIOPageRange) {
             addr = (1 << this.nIOPageRange) - BusPDP11.IOPAGE_LENGTH;
-            this.setMemoryBlocks(addr, BusPDP11.IOPAGE_LENGTH, this.prevIOPageBlocks);
+            this.setMemoryBlocks(addr, BusPDP11.IOPAGE_LENGTH, this.aIOPrevBlocks);
             this.nIOPageRange = 0;
         }
         if (nRange) {
@@ -460,12 +460,12 @@ BusPDP11.prototype.setIOPageRange = function(nRange)
             addr = (1 << nRange);
             this.nBusLimit = this.nBusMask = (addr - 1);
             addr -= BusPDP11.IOPAGE_LENGTH;
-            this.prevIOPageBlocks = this.getMemoryBlocks(addr, BusPDP11.IOPAGE_LENGTH);
-            if (this.realIOPageBlocks) {
-                this.setMemoryBlocks(addr, BusPDP11.IOPAGE_LENGTH, this.realIOPageBlocks);
+            this.aIOPrevBlocks = this.getMemoryBlocks(addr, BusPDP11.IOPAGE_LENGTH);
+            if (this.aIOPageBlocks) {
+                this.setMemoryBlocks(addr, BusPDP11.IOPAGE_LENGTH, this.aIOPageBlocks);
             } else {
                 this.addMemory(addr, BusPDP11.IOPAGE_LENGTH, MemoryPDP11.TYPE.CONTROLLER, this);
-                this.realIOPageBlocks = this.getMemoryBlocks(addr, BusPDP11.IOPAGE_LENGTH);
+                this.aIOPageBlocks = this.getMemoryBlocks(addr, BusPDP11.IOPAGE_LENGTH);
             }
         }
     }
@@ -675,7 +675,14 @@ BusPDP11.prototype.zeroMemory = function(addr, size)
     var off = addr & this.nBlockLimit;
     var iBlock = addr >>> this.nBlockShift;
     while (size > 0 && iBlock < this.aMemBlocks.length) {
-        this.aMemBlocks[iBlock].zero(off, size);
+        var block = this.aMemBlocks[iBlock];
+        if (block.controller) {
+            if (this.aIOPageBlocks && this.aIOPageBlocks.length == this.aIOPrevBlocks.length) {
+                var i = this.aIOPageBlocks.indexOf(block);
+                if (i >= 0) block = this.aIOPrevBlocks[i];
+            }
+        }
+        if (block) block.zero(off, size);
         size -= this.nBlockSize;
         iBlock++;
         off = 0;
diff --git a/modules/pdp11/lib/memory.js b/modules/pdp11/lib/memory.js
index 550782b80..96b047c3d 100644
--- a/modules/pdp11/lib/memory.js
+++ b/modules/pdp11/lib/memory.js
@@ -174,10 +174,9 @@ function MemoryPDP11(bus, addr, used, size, type, controller)
             a = this.ab = new Array(this.size);
         } else {
             /*
-             * NOTE: This is the default mode of operation (!TYPEDARRAYS && !BYTEARRAYS), because it
-             * seems to provide the best performance; and although in theory, that performance might
-             * come at twice the overhead of TYPEDARRAYS, it's increasingly likely that the JavaScript
-             * runtime will notice that all we ever store are 32-bit values, and optimize accordingly.
+             * NOTE: This used to be the default mode of operation (!TYPEDARRAYS && !BYTEARRAYS), because
+             * it seemed to provide the best performance; however, that was then, and this is now.  TYPEDARRAYS
+             * is more efficient.
              */
             a = this.adw = new Array(this.size >> 2);
         }
@@ -389,8 +388,8 @@ MemoryPDP11.prototype = {
      * zero(off, len)
      *
      * Zeros the block.  Supporting off and len parameters is probably overkill, and makes more
-     * work in the non-TYPEDARRAY, non-BYTEARRAY case, because there all we have is an array of DWORDs,
-     * but that's not the typical case.
+     * work in the non-TYPEDARRAY, non-BYTEARRAY case, but that's not the typical case.  The other
+     * exception is controller-based blocks, which may not have any array backing at all.
      *
      * @this {MemoryPDP11}
      * @param {number} [off] (optional starting byte offset within block)
@@ -404,7 +403,7 @@ MemoryPDP11.prototype = {
          */
         if (len === undefined) len = this.size;
         Component.assert(off >= 0 && off < this.size);
-        if (TYPEDARRAYS || BYTEARRAYS) {
+        if ((TYPEDARRAYS || BYTEARRAYS) && this.ab) {
             for (i = off; len-- && i < this.ab.length; i++) this.ab[i] = 0;
         } else {
             for (i = off; len-- && i < this.size; i++) this.writeByteDirect(off, 0, this.addr + off);
diff --git a/versions/pdpjs/1.30.2/pdp11-dbg.js b/versions/pdpjs/1.30.2/pdp11-dbg.js
index d240a84e3..37e99b13e 100644
--- a/versions/pdpjs/1.30.2/pdp11-dbg.js
+++ b/versions/pdpjs/1.30.2/pdp11-dbg.js
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-function Cb(a,b,c,d){for(var e in c){var f=+e,g=c[e];if(!(g[6]&&g[6]>a.b.xb)){var h=g[0]?g[0].bind(b):null,l=g[1]?g[1].bind(b):null,m=g[2]?g[2].bind(b):null,n=g[3]?g[3].bind(b):null,r=g[5]||1;65472<=f&&65487>=f&&(!h&&m&&(h=function(a){return function(b){return a(b)&255}.bind(b)}(m)),!l&&n&&(l=function(a){return function(b,c){return a(b,c)}.bind(b)}(n)));for(var t=g[4],w=0;w<r;w++,f+=2)t&&1<r&&(t=g[4]+w),zc(a,f,f,h,l,m,n,t,d||64)}}}function Eb(a,b){a.B.push(b)}
+function yc(a){for(var b=0,c=[],d=0;d<a.D;d++){var e=a.W[d];if(e.Sa||e.Oc){c[b++]=d;var f=b++;if(e=e.save()){for(var g=0,h=0,l=[];g<e.length;){for(var m=e[g],n=g+1;n<e.length&&e[n]===m;)n++;l[h++]=n-g;l[h++]=m;g=n}l.length<e.length&&(e=l)}c[f]=e}}return c}function zc(a,b,c,d,e,f,g,h,l){for(;b<=c;b+=2){var m=b&pc;void 0!==a.Za[m]?q("I/O address already registered: "+p(b,8,!0)):a.Za[m]=[d,e,f,g,h||"unknown",l,!1]}}
+function Cb(a,b,c,d){for(var e in c){var f=+e,g=c[e];if(!(g[6]&&g[6]>a.b.xb)){var h=g[0]?g[0].bind(b):null,l=g[1]?g[1].bind(b):null,m=g[2]?g[2].bind(b):null,n=g[3]?g[3].bind(b):null,r=g[5]||1;65472<=f&&65487>=f&&(!h&&m&&(h=function(a){return function(b){return a(b)&255}.bind(b)}(m)),!l&&n&&(l=function(a){return function(b,c){return a(b,c)}.bind(b)}(n)));for(var t=g[4],w=0;w<r;w++,f+=2)t&&1<r&&(t=g[4]+w),zc(a,f,f,h,l,m,n,t,d||64)}}}function Eb(a,b){a.C.push(b)}
 k.Da=function(a,b,c){this.f=!0;this.ma||(this.i&&F(this.i,32)&&E(this.i,"memory fault ("+c+") on address "+J(this.i,a),!0,!0),b&&(this.b.ga|=b),this.b.qa(4,a))};function Ic(a){var b=a.f;a.f=!1;return b}function vc(a,b,c){q("Memory block error ("+a+": "+p(b)+","+p(c)+")");return!1}function K(a){u.call(this,"Device",a,K,256);this.f={fa:0,kc:-1}}z(K);k=K.prototype;
 k.Ea=function(a,b,c,d){this.w=b;this.b=c;this.i=d;var e=this;this.f.kc=Jc(c,function(){e.f.bb|=128;e.f.bb&64&&(Kc(e.b,e.f.Xd),Lc(e.b,e.f.kc,1E3/60))});this.f.Xd=Mc(64,6);Cb(b,this,L);Eb(b,this.reset.bind(this));H(this)};k.reset=function(){this.f.bb=0};k.nd=function(){var a=this.f.bb;this.f.bb&=-129;return a};k.ge=function(a){this.f.bb=a;a&64&&Lc(this.b,this.f.kc,1E3/60);this.f.bb=a&-129};k.pd=function(){var a=this.b;return a.C&62337|a.Ja<<5|a.Na<<1};
 k.ie=function(a){var b=this.b;a&=62337;if(b.C!=a){b.C=a;b.Ja=a>>5&3;b.Na=a>>1&15;var c=0;a&257&&(c=4,a&1&&(c|=2));b.Ua!=c&&(b.Ua=c,Nc(b))}};k.qd=function(){var a=this.b.eb;a&65280&&(a=(a<<8|a>>8)&65535);return a};k.rd=function(){return this.b.Kb};k.sd=function(){return this.b.pb};k.je=function(a){var b=this.b;1170>b.xb&&(a&=-49);b.pb!=a&&(b.pb=a,b.Rb=a&16?4194303:262143,Nc(b))};k.Sd=function(a){a=a>>1&63;var b=this.b.Lb[a>>1];return a&1?b>>16:b&65535};
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+I.prototype={constructor:I,parent:null,save:function(){var a,b;if(this.controller)a=null;else if(wb)for(a=Array(this.size>>2),b=0;b<a.length;b++)a[b]=this.D.getInt32(b<<2,!0);else a=this.b;return a},restore:function(a){if(this.controller)return!a;if(a&&this.size==a.length<<2){var b;if(wb)for(b=0;b<a.length;b++)this.D.setInt32(b<<2,a[b],!0);else this.b=a;return this.Sa=!0}return!1},nb:function(a,b){b?this.A++||$c(this,ad,!1):this.g++||bd(this,ad,!1)},K:function(a,b){this.i&&F(this.i,128)&&E(this.i,
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@@ -159,19 +159,19 @@ this.f?2:0)}],ag=[function(a){S(this,a,0,He);this.b-=this.g?9+(this.sb&1):3+(7==
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 Xa(function(){for(var a=D(document,"pdp11","rom"),b=0;b<a.length;b++){var c=a[b],d=B(c),d=new ng(d);C(d,c)}});
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+function qg(a){u.call(this,"RAM",a,qg);this.ia=this.g=null;this.A=a.addr;this.C=a.size;this.La=a.load;this.Ka=a.exec;this.v=!1;this.f=a.file;this.D=sa(this.f);if(this.f){a=this.f;var b=ta(this.D);"json"!=b&&"hex"!=b&&(a=Ga()+"/api/v1/dump?file="+this.f+"&format=bytes&decimal=true");var c=this;Ea(a,null,!0,function(a,b,f){f?(c.O("Unable to load RAM resource (error "+f+": "+a+")"),c.f=null):(nb(c.Qa,a,b),(a=Fa(a,b))?(c.g=a.ea,c.ia=a.ia,null==c.La&&(c.La=a.La),null==c.Ka&&(c.Ka=a.Ka)):c.f=null);rg(c)})}}
+z(qg);qg.prototype.Ea=function(a,b,c,d){this.w=b;this.b=c;this.i=d;rg(this)};qg.prototype.Ha=function(){this.ia&&(this.i&&pg(this.i,this.id,this.A,this.C,this.ia),delete this.ia);return!0};qg.prototype.Ga=function(){return!0};function rg(a){if(a.w&&(!a.v&&a.C&&tc(a.w,a.A,a.C,1)&&(a.v=!0),!tb(a))){if(!a.v)q("No RAM allocated");else if(a.f){if(!a.g||!a.w)return;Lg(a,a.g,a.La,a.Ka,a.A)}H(a)}}
+qg.prototype.reset=function(){if(this.v){for(var a=this.w,b=this.A,c=this.C,d=b&a.w,b=b>>>a.la;0<c&&b<a.W.length;){var e=a.W[b];if(e.controller&&a.g&&a.g.length==a.v.length){var f=a.g.indexOf(e);0<=f&&(e=a.v[f])}if(e){var f=c,g,d=d||0;void 0===f&&(f=e.size);if(wb&&e.G)for(g=d;f--&&g<e.G.length;g++)e.G[g]=0;else for(g=d;f--&&g<e.size;g++)e.$b(d,0,e.F+d)}c-=a.ya;b++;d=0}this.g&&Lg(this,this.g,this.La,this.Ka,this.A,!0)}};
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-k.Ea=function(a,b,c,d){this.B=a;this.w=b;this.b=c;this.i=d;var e=this;this.ka=Mc(48,4);this.Y=Jc(this.b,function(){e.f&128||!e.C.length||(e.K=e.C.shift()&255,e.da&&97<=e.K&&122>e.K&&(e.K-=32),e.f|=128,e.f&64&&Kc(e.b,e.ka))});this.na=Mc(52,4);this.aa=Jc(this.b,function(){e.g|=128;e.g&64&&Kc(e.b,e.na)});Cb(b,this,Og);H(this)};
-k.wc=function(){if(!this.J){var a=hd(this.B,"connection");if(a){var b=a.split("->");if(2==b.length){var c=ya(b[0]);if(c!=this.lb)return;b=ya(b[1]);if(this.J=pb(b)){var d=this.J.exports;if(d){var e=d.connect;e&&e.call(this.J);if(this.L=d.receiveData){this.status(this.Qa+"."+c+" connected to "+b);return}}}}this.status("Unable to establish connection: "+a)}}};k.Ha=function(a,b){if(!b)if(this.wc(),!a||!this.restore)this.reset();else if(!this.restore(a))return!1;return!0};
+k.Ea=function(a,b,c,d){this.A=a;this.w=b;this.b=c;this.i=d;var e=this;this.ka=Mc(48,4);this.Y=Jc(this.b,function(){e.f&128||!e.C.length||(e.K=e.C.shift()&255,e.da&&97<=e.K&&122>e.K&&(e.K-=32),e.f|=128,e.f&64&&Kc(e.b,e.ka))});this.na=Mc(52,4);this.aa=Jc(this.b,function(){e.g|=128;e.g&64&&Kc(e.b,e.na)});Cb(b,this,Og);H(this)};
+k.wc=function(){if(!this.J){var a=hd(this.A,"connection");if(a){var b=a.split("->");if(2==b.length){var c=ya(b[0]);if(c!=this.lb)return;b=ya(b[1]);if(this.J=pb(b)){var d=this.J.exports;if(d){var e=d.connect;e&&e.call(this.J);if(this.L=d.receiveData){this.status(this.Qa+"."+c+" connected to "+b);return}}}}this.status("Unable to establish connection: "+a)}}};k.Ha=function(a,b){if(!b)if(this.wc(),!a||!this.restore)this.reset();else if(!this.restore(a))return!1;return!0};
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+k.Ea=function(a,b,c,d){this.A=a;this.w=b;this.b=c;this.i=d;this.S=Ug(a);var e=this;if((this.g=hd(this.A,"autoMount")||this.g)&&"string"==typeof this.g)try{this.g=eval("("+this.g+")")}catch(f){q("PC11 auto-mount error: "+f.message+" ("+this.g+")"),this.g=null}this.Y=Mc(56,4);this.da=Jc(this.b,function(){1==(e.f&32769)&&!(e.f&128)&&e.K<e.J.length&&(e.L=e.J[e.K++]&255,Vg(e,e.K/e.J.length*100),e.f|=128,e.f&=-2049,e.f&64&&Kc(e.b,e.Y))});Cb(b,this,Wg);Xg(this,"None",Rg,!0);this.P&&Xg(this,"Local Tape",
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+function bh(a,b,c,d,e){var f=c;if(e){var g=new FileReader;g.onload=function(){var e=g.result;e&&(e=new Uint8Array(e,0,e.byteLength),ch(a,b,c,d,e),a.H="?");$g(a)};g.readAsArrayBuffer(e);return!0}0>c.indexOf("/api/v1/dump")&&(e=ta(c),f="json"==e||"gz"==e?encodeURI(c):Ga()+"/api/v1/dump?path="+encodeURIComponent(c)+"&format=json");return!!Ea(f,null,!0,function(e,f,g){var h=0>g&&a.A&&!a.A.B.ja;g?a.O('Unable to load tape "'+b+'" (error '+g+": "+e+")",h):(nb(a.Qa,e,f),(e=Fa(e,f))&&ch(a,b,c,d,e.ea,e.La,
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 function ih(a,b,c,d,e){var f=c;if(a.w)return!0;a.Xa=b;a.gb=c;a.Dc=sa(c);a.w=e;a.C=a.controller;if(d){var g=new FileReader;g.onload=function(){var b=g.result,c,d=b?b.byteLength:0,e=la[d];if(e){a.va=e[0];a.za=e[1];a.ra=e[2];a.Ma=e[3]||512;c=a.Ma>>2;var f=e=0,b=new DataView(b,0,d);a.b=Array(a.va);for(d=0;d<a.b.length;d++)for(var t=a.b[d]=Array(a.za),w=0;w<t.length;w++)for(var y=t[w]=Array(a.ra),x=0;x<y.length;x++){for(var A=hh(null,d,w,x+1,a.Ma,0),ja=A.data,Ja=0;Ja<c;Ja++,f+=4)var Q=ja[Ja]=b.getInt32(f,
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 null,!0,function(b,c,d){jh(a,b,c,d)})}
-function jh(a,b,c,d){var e=null;a.g=!1;var f=0>d&&a.B&&!a.B.A.ja;if(d)a.controller.O('Unable to load disk "'+a.Xa+'" (error '+d+": "+b+")",f);else{nb(a.controller.Qa,b,c);try{if(0<sa(a.Dc,!0).toLowerCase().indexOf("-readonly"))a.g=!0;else{var g=c.indexOf("\n");0<g&&1024>g&&0<c.substring(0,g).indexOf("write-protected")&&(a.g=!0)}var h;"<"==c.substr(0,1)?h=["Missing disk image: "+a.Xa]:h=0>c.indexOf("0x")&&'["'!=c.substr(0,2)?JSON.parse(c.replace(/([a-z]+):/gm,'"$1":').replace(/\/\/[^\n]*/gm,"")):eval("("+
+function jh(a,b,c,d){var e=null;a.g=!1;var f=0>d&&a.A&&!a.A.B.ja;if(d)a.controller.O('Unable to load disk "'+a.Xa+'" (error '+d+": "+b+")",f);else{nb(a.controller.Qa,b,c);try{if(0<sa(a.Dc,!0).toLowerCase().indexOf("-readonly"))a.g=!0;else{var g=c.indexOf("\n");0<g&&1024>g&&0<c.substring(0,g).indexOf("write-protected")&&(a.g=!0)}var h;"<"==c.substr(0,1)?h=["Missing disk image: "+a.Xa]:h=0>c.indexOf("0x")&&'["'!=c.substr(0,2)?JSON.parse(c.replace(/([a-z]+):/gm,'"$1":').replace(/\/\/[^\n]*/gm,"")):eval("("+
 c+")");if(h.length)if(1==h.length)q(h[0]);else{a.va=h.length;a.za=h[0].length;a.ra=h[0][0].length;var l=h[0][0][0];a.Ma=l&&l.length||512;for(d=c=0;d<a.va;d++)for(f=0;f<a.za;f++)for(g=0;g<a.ra;g++)if(l=h[d][f][g]){var m=l.length;void 0===m&&(m=l.length=512);var m=m>>2,n=l.pattern;void 0===n&&(n=l.pattern=0);var r=l.data;if(void 0===r){var t=l.bytes;if(void 0!==t&&t.length){for(var w=m<<2,y=t.length;y<w;y++)t[y]=n;kh(l,t)}else r=[],n=l.pattern=n|n<<8|n<<16|n<<24,l.data=r;delete l.bytes}hh(l,d,f);for(w=
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 k.seek=function(a,b,c,d,e){d=null;var f=this.v,g=this.b[a];if(g){var h=g[b];if(!h&&f.Jc&&b<f.za)for(h=g[b]=Array(f.Kc),g=0;g<h.length;g++)h[g]=hh(null,a,b,g+1,f.xc,0);if(h){for(g=0;g<h.length;g++)if(h[g]&&h[g].sector==c){d=h[g];break}!d&&f.Jc&&9==f.nc&&(d=h[g]=hh(null,a,b,f.nc,f.xc,0))}}e&&e(d,!1);return d};function kh(a,b){for(var c=0,d=a.length>>2,e=Array(d),f=0;f<d;f++)e[f]=b[c]|b[c+1]<<8|b[c+2]<<16|b[c+3]<<24,c+=4;a.data=e}
@@ -208,12 +208,12 @@ k.ta=function(a,b,c){var d=this;switch(b){case "listDisks":return this.G[b]=c,c.
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 "string"!=typeof c.download&&(c=null));c?(c.href=b,c.download=a,document.body.appendChild(c),c.click(),document.body.removeChild(c),a="Check your Downloads folder for "+a+"."):(window.open(b),a="Check your browser for a new window/tab containing the requested data"+(a?" ("+a+")":"")+".");q(a)}else d.O("No disk loaded in drive.");else d.O("No disk drive selected.")};return!0;case "mountDrive":if(this.L)return this.G[b]=c,c.addEventListener("change",function(){var a=c.children[0];a.children[1].disabled=
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-k.Ea=function(a,b,c,d){this.B=a;this.w=b;this.b=c;this.i=d;if((this.v=hd(this.B,"autoMount")||this.v)&&"string"==typeof this.v)try{this.v=eval("("+this.v+")")}catch(e){q("RL11 auto-mount error: "+e.message+" ("+this.v+")"),this.v=null}qh(this);this.P=Mc(112,5);Cb(b,this,rh,2097152);sh(this,"None","",!0);this.L&&sh(this,"Local Disk","?");sh(this,"Remote Disk","??");th(this)||H(this)};
-k.Ha=function(a,b){if(!b){if(!a||!this.restore){if(this.reset(),this.B.rc){for(a=0;a<this.f.length;a++)uh(this,a,!0);th(this,!0)}}else if(!this.restore(a))return!1;if(a=this.G.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";oh(this,0)}}return!0};k.Ga=function(a){return a?this.save():!0};k.reset=function(){qh(this)};k.save=function(){return(new P(this)).data()};
+k.Ea=function(a,b,c,d){this.A=a;this.w=b;this.b=c;this.i=d;if((this.v=hd(this.A,"autoMount")||this.v)&&"string"==typeof this.v)try{this.v=eval("("+this.v+")")}catch(e){q("RL11 auto-mount error: "+e.message+" ("+this.v+")"),this.v=null}qh(this);this.P=Mc(112,5);Cb(b,this,rh,2097152);sh(this,"None","",!0);this.L&&sh(this,"Local Disk","?");sh(this,"Remote Disk","??");th(this)||H(this)};
+k.Ha=function(a,b){if(!b){if(!a||!this.restore){if(this.reset(),this.A.rc){for(a=0;a<this.f.length;a++)uh(this,a,!0);th(this,!0)}}else if(!this.restore(a))return!1;if(a=this.G.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";oh(this,0)}}return!0};k.Ga=function(a){return a?this.save():!0};k.reset=function(){qh(this)};k.save=function(){return(new P(this)).data()};
 k.restore=function(a){return qh(this,a[0])};function th(a,b){b||(a.H=0);if(a.v)for(var c in a.v){var d=a.v[c],e=d.path||"",f;if(!(f=d.name))a:{if((f=a.G.listDisks)&&f.options)for(var g=0;g<f.options.length;g++){var h=f.options[g];if(h.value==e){f=h.text;break a}}f=sa(e,!0)}if(e&&f&&(g=-1,c&&(g=c.charCodeAt(c.length-1)-48,0>g||9<g)&&(g=-1),0<=g&&g<a.f.length)){!vh(a,g,f,e,!0)&&b&&H(a,!1);continue}a.O("Incorrect auto-mount settings for drive "+c+" ("+JSON.stringify(d)+")")}return!!a.H}
 function ph(a,b,c,d){var e=a.G.listDrives,e=e&&qa(e.value,10);if(void 0===e||0>e||e>=a.f.length)a.O("Unable to load the selected drive");else if(c)if("?"==c)a.O('Use "Choose File" and "Mount" to select and load a local disk.');else{if("??"==c){c=window.prompt("Enter the URL of a remote disk image.","")||"";if(!c)return;b=sa(c);a.status("Attempting to load "+c+' as "'+b+'"')}vh(a,e,b,c,!1,d)}else uh(a,e)}
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-k.Mc=function(a,b,c,d,e){var f;a.dc=!1;b&&(f=b.b.length?[b.b.length,b.b[0].length,b.b[0][0].length,b.b[0][0][0].length]:[0,0,0,0],b&&f[0]>a.va||f[1]>a.za)&&(this.O('Disk "'+c+'" too large for drive '+("RL"+a.fc)),b=null);b?(a.Ca=b,a.Xa=c,a.gb=d,this.O('Mounted disk "'+c+'" in drive '+("RL"+a.fc),a.cc||e),this.B&&this.B.rb()):a.Pb=!1;a.cc&&(a.cc=!1,--this.H||H(this));oh(this,a.fc)};
+k.Mc=function(a,b,c,d,e){var f;a.dc=!1;b&&(f=b.b.length?[b.b.length,b.b[0].length,b.b[0][0].length,b.b[0][0][0].length]:[0,0,0,0],b&&f[0]>a.va||f[1]>a.za)&&(this.O('Disk "'+c+'" too large for drive '+("RL"+a.fc)),b=null);b?(a.Ca=b,a.Xa=c,a.gb=d,this.O('Mounted disk "'+c+'" in drive '+("RL"+a.fc),a.cc||e),this.A&&this.A.rb()):a.Pb=!1;a.cc&&(a.cc=!1,--this.H||H(this));oh(this,a.fc)};
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 function oh(a,b){if(0<=b&&b<a.f.length){var c=a.f[b],d=a.G.listDisks;a=a.G.listDrives;if(d&&a&&d.options&&a.options&&(a=qa(a.value,10),c=c.Pb?"?":c.gb,!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 uh(a,b,c){var d=a.f[b];if(d.Ca||!1===c)d.Xa="",d.gb="",d.Ca=null,d.Pb=!1,c||(a.O("Drive RL"+b+" unloaded",c),oh(a,b))}
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+f?0:1;break;case "V":d.U=f?32768:0;break;case "C":d.T=f?65536:0;break;case "SW":if(a.f&&fc(a.f)){e=a.f;if(fc(e)){e.Va=f;for(b=0;22>b;b++)e.g["S"+b][0]=f&1<<b?1:0;Gb(e)}break}default:if("R"==b.charAt(0)&&(b=+b.charAt(1),0<=b&&6>b)){d.u[b]=f&65535;break}a.j("unknown register: "+e);return}a.A.$();a.j("updated registers:")}a.j(gi(a));c&&(a.L=Z(d.u[7]),Yh(a,J(a,a.L.F)))}}function li(a,b){b=ya(b);var c=b.match(/^(['"])(.*?)\1$/);c?1<c[2].length?a.j(c[2]):Eh(a,null,c[2].charCodeAt(0)):Bh(a,b,!0)}
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+"key"==oa&&(oa="keys"),Ub+=oa}void 0===G&&a.j("message commands:\n\tm [category] [on|off]\tturn categories on/off");a.j((null!==pa?pa?"messages on:  ":"messages off: ":"message categories:\n\t")+(Ub||"none"));Ih(a)}break;case "p":if("print"==g[0]){li(a,b.substr(5));break}var Oi="pr"==g[0]?1:0;if(a.S)a.j("step in progress");else{var Jg=Z(a.b.u[7]);a.Gb(Jg);a.S?(a.nb(a.g,Jg,!0),a.ib()||(a.A&&a.A.rb(),a.S=0)):mi(a,Oi?"tr":"t")}break;case "r":if("reset"==b){a.A&&a.A.reset();break}Xh(a,g);break;case "s":a:switch(g[1]){case "base":if(g[2]){var Vb=
++g[2];if(8==Vb||10==Vb||16==Vb)a.da=Vb;else{a.j("invalid base: "+Vb);break}}a.j("default base: "+a.da);break;case "cs":var Wb;void 0!==g[3]&&(Wb=+g[3]);switch(g[2]){case "int":a.b.yb=Wb;break;case "start":a.b.Ib=Wb;break;case "stop":a.b.zb=Wb;break;default:a.j("unknown cs option");break a}void 0!==Wb&&jd(a.b);a.j("checksums "+(a.b.B.wb?"enabled":"disabled"));break;case "sp":void 0!==g[2]&&(md(a.b,+g[2])||a.j("warning: using 1x multiplier, previous target not reached"));a.j("target speed: "+(a.b.ob.toFixed(2)+
 "Mhz")+" ("+a.b.cb+"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":mi(a,g[0],g[1]);break;case "u":Yh(a,g[1],g[2],8);break;case "v":if("var"==g[0]){ji(a,b.substr(3))||(d=!1);break}if("ver"==
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+function oi(a,b,c){u.call(this,"Computer",a,oi,67108864);this.B.ja=!1;pi(this,b);this.L=hd(this,"autoPower",a);this.v=0;this.Y=a.busWidth||a.buswidth;this.g=qi;this.J=null;this.D=this.R=!1;this.aa=hd(this,"url")||"";(Math.random()+.1).toString(36);this.A=ri(this);if(this.b=qb("CPU",this.id)){this.i=qb("Debugger",this.id);this.w=new ic({id:this.Qa+".bus",busWidth:this.Y},this.b,this.i);var d,e=ob(this.id);if((this.f=qb("Panel",this.id))&&this.f.Ra)for(b=0;b<e.length;b++)d=e[b],d.O=this.f.O,d.j=this.f.j,
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diff --git a/versions/pdpjs/1.30.2/pdp11.js b/versions/pdpjs/1.30.2/pdp11.js
index 9d7f5bc21..0349b32e7 100644
--- a/versions/pdpjs/1.30.2/pdp11.js
+++ b/versions/pdpjs/1.30.2/pdp11.js
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