diff --git a/devices/pc8080/machine/vt100/machine.xml b/devices/pc8080/machine/vt100/machine.xml
index d13953d86..4054ddfae 100644
--- a/devices/pc8080/machine/vt100/machine.xml
+++ b/devices/pc8080/machine/vt100/machine.xml
@@ -3,7 +3,7 @@
 <machine id="vt100" class="pc8080" border="1" pos="center" background="#FAEBD7">
 	<name pos="center">VT100 Terminal</name>
 	<computer id="computer" busWidth="16"/>
-	<cpu id="cpu8080" model="8080" cycles="2000000"/>
+	<cpu id="cpu8080" model="8080" cycles="2764798"/>
 	<rom id="rom" addr="0x0000" size="0x2000" file="/devices/pc8080/rom/vt100/VT100.json"/>
 	<ram id="ram" addr="0x2000" size="0x0C00"/>
 	<video id="video" screenWidth="1600" screenHeight="960" smoothing="false"
diff --git a/modules/pc8080/lib/chipset.js b/modules/pc8080/lib/chipset.js
index 012213678..4f850c25f 100644
--- a/modules/pc8080/lib/chipset.js
+++ b/modules/pc8080/lib/chipset.js
@@ -166,6 +166,13 @@ ChipSet.SI1978 = {
     }
 };
 
+/*
+ * One of the many chips in the VT100 is an 8224, which operates at 24.8832MHz.  That frequency is divided by 9
+ * to yield a 361.69ns clock period for the 8080 CPU, which means the CPU is running at 2.76Mhz (cycles per second).
+ * Hence the CPU component in the VT100's machine.xml is defined as:
+ *
+ *      <cpu id="cpu8080" model="8080" cycles="2764798"/>
+ */
 ChipSet.VT100 = {
     MODEL:          100.0,
     FLAGS_BUFFER: {
@@ -181,22 +188,46 @@ ChipSet.VT100 = {
     },
     BRIGHTNESS_LATCH: {
         PORT:       0x42,               // write-only
-        INIT:       0x00
+        INIT:       0x00                // for lack of a better guess
     },
     NVR_LATCH: {
         PORT:       0x62,               // write-only
-        INIT:       0x00
+        INIT:       0x00                // for lack of a better guess
     },
     DC012: {                            // generates scan counts for the Video Processor
         PORT:       0xA2,               // write-only
-        INIT:       0x00
+        INIT:       0x00                // for lack of a better guess
     },
+    /*
+     * As p. 4-55 (105) of the July 1982 Technical Manual explains:
+     *
+     *      The DCO11 is a custom designed bipolar circuit that provides most of the timing signals required by the
+     *      video processor. Internal counters divide the output of a 24.0734 MHz oscillator (located elsewhere on the
+     *      terminal controller module) into the lower frequencies that define dot, character, scan, and frame timing.
+     *      The counters are programmable through various input pins to control the number of characters per line,
+     *      the frequency at which the screen is refreshed, and whether the display is interlaced or noninterlaced.
+     *      These parameters can be controlled through SET-UP mode or by the host.
+     *
+     * On p. 4-56, the DC011 Block Diagram shows 8 outputs labeled LBA0 through LBA7.  From p. 4-61:
+     *
+     *      Several of the LBAs are used as general purpose clocks in the VT100. LBA 3 and LBA 4 are used to generate
+     *      timing for the keyboard. These signals satisfy the keyboard's requirement of two square-waves, one twice the
+     *      frequency of the other, even though every 16th transition is delayed (the second stage of the horizontal
+     *      counter divides by 17, not 16). LBA 7 is used by the nonvolatile RAM.
+     *
+     * And on p. 4-62, timings are provided for the LBA0 through LBA7 when the VT100 is in 80-column mode; in particular:
+     *
+     *      LBA6:   16.82353us (when LBA6 is low, for a period is 33.64706us)
+     *      LBA7:   31.77778us (when LBA7 is high, for a period is 63.55556us)
+     *
+     * If we assume that the CPU cycle count increments once every 361.69ns, it will increment roughly 88 times every
+     * time LBA7 toggles.  So we can divide the CPU cycle count by 88 and set LBA to the low bit of that truncated
+     * result.  An even faster (but less accurate) solution would be to mask bit 6 of the CPU cycle count, which will
+     * doesn't change until the count has been incremented 64 times.  See getVT100LBA() to see the chosen implementation.
+     */
     DC011: {                            // generates Line Buffer Addresses (LBAs) for the Video Processor
         PORT:       0xC2,               // write-only
-        INIT:       0x00
-    },
-    LBA: {                              // used to simulate LBA0 through LBA7 (LBA7 is used to drive NVR_CLK)
-        INIT:       0x00
+        INIT:       0x00                // for lack of a better guess
     }
 };
 
@@ -315,8 +346,7 @@ ChipSet.VT100.init = [
         ChipSet.VT100.NVR_LATCH.INIT,
         ChipSet.VT100.FLAGS_BUFFER.NO_AVO | ChipSet.VT100.FLAGS_BUFFER.NO_GFX,
         ChipSet.VT100.DC012.INIT,
-        ChipSet.VT100.DC011.INIT,
-        ChipSet.VT100.LBA.INIT
+        ChipSet.VT100.DC011.INIT
     ]
 ];
 
@@ -348,7 +378,7 @@ ChipSet.prototype.save = function()
         state.set(0, [this.bStatus0, this.bStatus1, this.bStatus2, this.wShiftData, this.bShiftCount, this.bSound1, this.bSound2]);
         break;
     case ChipSet.VT100.MODEL:
-        state.set(0, [this.bBrightnessLatch, this.bNVRLatch, this.bFlagsBuffer, this.bDC012, this.bDC011, this.bLBA]);
+        state.set(0, [this.bBrightnessLatch, this.bNVRLatch, this.bFlagsBuffer, this.bDC012, this.bDC011]);
         break;
     }
     return state.data();
@@ -383,7 +413,6 @@ ChipSet.prototype.restore = function(data)
             this.bFlagsBuffer = a[2];
             this.bDC012 = a[3];
             this.bDC011 = a[4];
-            this.bLBA = a[5];
             return true;
         }
     }
@@ -586,6 +615,24 @@ ChipSet.prototype.outSIWatchdog = function(port, b, addrFrom)
     this.printMessageIO(port, b, addrFrom, "WATCHDOG", null, true);
 };
 
+/**
+ * getVT100LBA(nBit)
+ *
+ * Returns the state of the requested (simulated) LBA bit.
+ *
+ * NOTE: This is currently only used to obtain LBA7, which we approximate with the slightly faster approach
+ * of masking bit 6 of the CPU cycle count (see the DC011 discussion above).  This will result in a shorter LBA7
+ * period than if we divided the cycle count by 88, but a shorter LBA7 period is probably helpful in terms of
+ * overall performance.
+ *
+ * @param {number} nBit
+ * @return {number}
+ */
+ChipSet.prototype.getVT100LBA = function(nBit)
+{
+    return (this.cpu.getCycles() & (1 << (nBit - 1))) << 1;
+};
+
 /**
  * inVT100FlagsBuffer(port, addrFrom)
  *
@@ -596,8 +643,10 @@ ChipSet.prototype.outSIWatchdog = function(port, b, addrFrom)
  */
 ChipSet.prototype.inVT100FlagsBuffer = function(port, addrFrom)
 {
-    this.bLBA++;
-    var b = this.bFlagsBuffer = (this.bFlagsBuffer & ~ChipSet.VT100.FLAGS_BUFFER.NVR_CLK) | ((this.bLBA & 0x80)? ChipSet.VT100.FLAGS_BUFFER.NVR_CLK : 0);
+    /*
+     * The NVR_CLK bit is driven by LBA7 (ie, bit 7 from Line Buffer Address generation); see the DC011 discussion above.
+     */
+    var b = this.bFlagsBuffer = (this.bFlagsBuffer & ~ChipSet.VT100.FLAGS_BUFFER.NVR_CLK) | (this.getVT100LBA(7)? ChipSet.VT100.FLAGS_BUFFER.NVR_CLK : 0);
     this.printMessageIO(port, null, addrFrom, "FLAGS.BUFFER", b, true);
     return b;
 };
diff --git a/versions/pc8080/1.23.3/pc8080-dbg.js b/versions/pc8080/1.23.3/pc8080-dbg.js
index 32c11a50a..23fd2b9fe 100644
--- a/versions/pc8080/1.23.3/pc8080-dbg.js
+++ b/versions/pc8080/1.23.3/pc8080-dbg.js
@@ -1,123 +1,124 @@
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+S.prototype.Ma=function(a,b,c,d){this.A=b;this.b=c;this.G=d;this.u=a;yb(b,this,this.w.Kb);Cb(b,this,this.w.Lb)};S.prototype.Ca=function(a,b){if(!b)if(!a)this.reset();else if(!this.restore(a))return!1;return!0};S.prototype.Ha=function(a){return a?this.save():!0};T.Ua=[[T.Ic.rb,T.Pa.rb,T.Jc.rb,0,0,0,0]];U.Ua=[[U.rc.INIT,U.Cc.INIT,U.Eb.Ac|U.Eb.Bc,U.uc.INIT,U.tc.INIT]];m=S.prototype;m.reset=function(){this.restore(this.w.Ua)||this.fa("reset error")};
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+function Ad(a,b,c){a.C&=~b;c&&(a.C|=b)}m.Oc=function(a,b){var c=this.da;D(this,a,null,b,"STATUS0",c);return c};m.Pc=function(a,b){var c=this.C;D(this,a,null,b,"STATUS1",c);return c};m.Qc=function(a,b){var c=this.ea;D(this,a,null,b,"STATUS2",c);return c};m.Nc=function(a,b){var c=this.F>>8-this.I&255;D(this,a,null,b,"SHIFT.RESULT",c);return c};m.Uc=function(a,b,c){D(this,a,b,c,"SHIFT.COUNT",null);this.I=b};m.Wc=function(a,b,c){D(this,a,b,c,"SOUND1",null);this.aa=b};
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+function Fd(a,b){if(rb(a.A,b,a.C,a.I?1:Tb)){var c;for(c=0;c<a.u.length;c++)wb(a.A,b+c,a.u[c]);if(a.I&&256==b){for(c=0;c<Dd.length;c++)wb(a.A,Dd[c],118);Ec(a.b,function(a){return function(b){if(0<=Dd.indexOf(b)){var c=!1,h=a.b,g=a.G;if(5==b)switch(c=!0,h.O){case 2:Gd(a,String.fromCharCode(h.R));break;case 9:for(var k=Lc(h),l="",n=255;n--;){var p=a.b.X(k++);if(36==p)break;l+=String.fromCharCode(p)}Gd(a,l);break;default:c=!1}c?xd.call(h):g&&(a.g("\nCP/M vector "+t(b)),H(h,b),g.ia());b=!0}else b=!1;return b}}(a));
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+m.reset=function(){!this.u&&this.C&&rb(this.A,this.w,this.C,1)&&(this.u=!0);this.u||w("No RAM allocated")};m.save=function(){return null};m.restore=function(){return!0};Ha(function(){for(var a=C(document,"pc8080","ram"),b=0;b<a.length;b++){var c=a[b],d=A(c),d=new Hd(d);ab(d,c)}});function Id(a){z.call(this,"Keyboard",a,Id,65536);this.reset();E(this)}Wa(Id);
+var Jd={Oa:{va:130,yc:1,xc:2,wc:4,vc:8,zc:16,Xb:32,Qd:64,md:128}},Kd={"1p":49,"2p":50,coin:51,left:37,right:39,fire:32},Ld={65:37,68:39,76:32},Md={l4:Jd.Oa.yc,l3:Jd.Oa.xc,l2:Jd.Oa.wc,l1:Jd.Oa.vc,locked:Jd.Oa.zc,online:Jd.Oa.Xb,local:~Jd.Oa.Xb};
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+Id.prototype.save=function(){var a=new Ic(this);switch(this.Ga){case U.Ea:I(a,0,[this.A])}return a.data()};Id.prototype.restore=function(a){var b;if(a&&(b=a[0])&&b.length)switch(this.Ga){case T.Ea:return!0;case U.Ea:return this.A=b[0],Pd(this),!0}return!1};function Pd(a){for(var b in Md){var c=a.K["led-"+b];if(c){var d=Md[b],e=!!(a.A&d);d&d-1&&(e=!(a.A&~d));c.style.backgroundColor=e?"#ff0000":"#000000"}}}
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-function Od(a,b,c){if(c)a.u[b]=Date.now(),delete a.b[b];else{var d=a.u[b];if(d&&100>Date.now()-d)return a.b[b]=d,Qd(a),!0;delete a.u[b]}if(a.C)switch(b){case "1p":Ad(a.C,V.Pa.vc,c);break;case "2p":Ad(a.C,V.Pa.zc,c);break;case "coin":Ad(a.C,V.Pa.pc,c);break;case "left":Ad(a.C,V.Pa.xc,c);break;case "right":Ad(a.C,V.Pa.yc,c);break;case "fire":Ad(a.C,V.Pa.wc,c)}return!0}
-function Qd(a){for(var b=-1,c=Object.keys(a.b),d=0;d<c.length;d++){var e=c[d],f=100-(Date.now()-a.b[e]);if(0<f){if(0>b||b>f)b=f}else delete a.b[e],Od(a,e,!1)}0<=b&&setTimeout(function(){Qd(a)},b)}Id.prototype.F=function(a,b,c){D(this,a,b,c,"KBDUART.STATUS",null);this.A=b;Pd(this)};Jd.Jb={};Jd.Kb={130:Id.prototype.F};Ha(function(){for(var a=C(document,"pc8080","keyboard"),b=0;b<a.length;b++){var c=a[b],d=A(c),d=new Id(d);ab(d,c)}});
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-this.F),this.F=0);this.kc=a.interruptRate;this.Yc=a.refreshRate||60;this.T=b;this.H=c;this.ya=(this.Zc=d)||b||null;this.Tc=this.Y;this.Uc=this.W;this.Gb=this.Y/this.Ra|0;this.cc=this.W/this.Fa|0;1<this.ea&&this.Fa++;b=a.smoothing;(c=Pa.smoothing)&&(b="true"==c);if(null!=b)for(c=0;c<h.length;c++)if(d=(d=h[c])?d+"ImageSmoothingEnabled":"imageSmoothingEnabled",void 0!==this.H[d]){this.H[d]=b;break}if(this.I=a.screenRotate)this.I=this.I%360,0<this.I&&(this.I-=360),-90!=this.I?(this.ca("unsupported screen rotation: "+
+function Od(a,b,c){if(c)a.u[b]=Date.now(),delete a.b[b];else{var d=a.u[b];if(d&&100>Date.now()-d)return a.b[b]=d,Qd(a),!0;delete a.u[b]}if(a.C)switch(b){case "1p":Ad(a.C,T.Pa.Dc,c);break;case "2p":Ad(a.C,T.Pa.Hc,c);break;case "coin":Ad(a.C,T.Pa.sc,c);break;case "left":Ad(a.C,T.Pa.Fc,c);break;case "right":Ad(a.C,T.Pa.Gc,c);break;case "fire":Ad(a.C,T.Pa.Ec,c)}return!0}
+function Qd(a){for(var b=-1,c=Object.keys(a.b),d=0;d<c.length;d++){var e=c[d],f=100-(Date.now()-a.b[e]);if(0<f){if(0>b||b>f)b=f}else delete a.b[e],Od(a,e,!1)}0<=b&&setTimeout(function(){Qd(a)},b)}Id.prototype.F=function(a,b,c){D(this,a,b,c,"KBDUART.STATUS",null);this.A=b;Pd(this)};Jd.Kb={};Jd.Lb={130:Id.prototype.F};Ha(function(){for(var a=C(document,"pc8080","keyboard"),b=0;b<a.length;b++){var c=a[b],d=A(c),d=new Id(d);ab(d,c)}});
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-this.ra={},this.Ea=1<<this.Qa,this.ua=Array(this.Ea+2),this.ua[0]=[0,0,0,255],this.ua[1]=[255,255,255,255],1==this.ha&&(this.ua[this.Ea+0]=[255,255,0,255],this.ua[this.Ea+1]=[0,255,0,255]),2==this.ha&&(this.Xc=60,this.sb=!1,this.va=Array(this.Ra));if(this.da=nb(a,"Keyboard")){for(var e in this.tb)this.da.ma("led",e,this.tb[e]);this.T&&this.da.ma(this.Zc?"textarea":"canvas","kbd",this.ya)}this.ia||F(this)};
-function Vd(a,b,c,d){if(d)a.ca("Unable to load font ROM (error "+d+": "+b+")");else{Ya(a.Pb,b,c);try{var e=eval("("+c+")"),f=e.bytes||e;if(!f||!f.length){w("Empty font ROM: "+b);return}if(1==f.length){w(f[0]);return}if(2048==f.length)Xd(a,f);else{a.ca("Unrecognized font data length ("+f.length+")");return}}catch(h){a.ca("Font ROM data error: "+h.message);return}(a.H||a.G)&&F(a)}}
-function Xd(a,b){a.ab=b;a.ra[96]=[Yd(a,a.la,a.ea),Yd(a,a.la,a.ea,a.sb)];a.ra[64]=[Yd(a,2*a.la,a.ea),Yd(a,2*a.la,a.ea,a.sb)];a.ra[32]=a.ra[0]=[Yd(a,2*a.la,2*a.ea),Yd(a,2*a.la,2*a.ea,a.sb)]}
-function Yd(a,b,c,d){var e=8>=a.Sc?8:16,f=8<e?15:0,h=a.ab.length/e,g=!1===d,k={la:b,ea:c};k.canvas=document.createElement("canvas");k.canvas.width=16*b;k.canvas.height=h/16*c;k.context=k.canvas.getContext("2d");for(var l=k.context.createImageData(b,c),n=0;n<h;n++){for(var p=0,v=p;p<a.ea;p++)for(var u=n*e+(f+p&e-1),u=d&&8==p?255:a.ab[u],r=0;r<c/a.ea;r++){for(var B=0,x=B;B<a.la;B++)for(var E=u&128>>(7<B?7:B),y=0;y<b/a.la;y++)g&&(E=!E),Zd(a,l,x,v,E?1:0),x++;v++}k.context.putImageData(l,(n&15)*b,(n>>
-4)*c)}return k}Rd.prototype.Ba=function(){return!0};Rd.prototype.ma=function(a,b,c){var d=this;if("led"==a||"rled"==a)return this.tb[b]=c,!0;switch(b){case "fullScreen":return this.K[b]=c,this.w&&this.w.cb?c.onclick=function(){d.cb()}:c.parentNode.removeChild(c),!0}return!1};
-Rd.prototype.cb=function(){var a=!1;if(this.w){if(this.w.cb){a="100%";if(screen&&screen.width&&screen.height){var b=screen.width/screen.height,c=this.Y/this.W;b>c&&(a=Math.round(c/b*100)+"%")}this.dc?(this.T.style.width=a,this.T.style.width=a,this.T.style.display="block",this.T.style.margin="auto"):(this.w.style.width=a,this.w.style.height="auto");this.w.style.backgroundColor="black";this.w.cb();a=!0}this.ya&&this.ya.focus()}return a};
-function Ud(a,b){!b&&a.w&&(a.dc?a.T.style.width=a.T.style.height="":a.w.style.width=a.w.style.height="");cb(a,"notifyFullScreen("+b+")",!0)}function Wd(a,b){a.fc=b;a.xa=!1;if(void 0===a.qa||a.qa.length!=a.fc)a.qa=Array(a.fc)}function Zd(a,b,c,d,e){d=a.F?(b.height-c-1)*b.width+d:c+d*b.width;e&&1==a.ha&&(208<=c&&236>c?e=a.Ea+0:28<=c&&72>c&&(e=a.Ea+1));a=a.ua[e];d*=a.length;b.data[d]=a[0];b.data[d+1]=a[1];b.data[d+2]=a[2];b.data[d+3]=a[3]}
+break}for(c=0;c<h.length;c++)if(d=h[c]+"fullscreenerror","on"+d in document){document.addEventListener(d,function(){Ud(f,null)},!1);break}}if(this.ea=a.fontROM)"json"!=ca(this.ea)&&(this.ea=oa()+"/api/v1/dump?file="+this.ea+"&format=bytes"),na(this.ea,null,!0,function(a,b,c){Vd(f,a,b,c)});this.tb={}}Wa(Rd);var Td=0,Sd={vt100:2};
+Rd.prototype.Ma=function(a,b,c,d){this.u=a;this.A=b;this.b=c;this.G=d;this.C=nb(a,"ChipSet");!this.da&&this.C&&this.C.Ga==T.Ea&&(this.da=1);this.J=this.Ra*this.la;this.aa=this.Fa*this.ga;b=this.J;c=this.aa;this.F&&(b=this.aa,c=this.J);this.Ta=(this.J*this.Qa>>3)*this.aa;if(this.fd||rb(this.A,this.Ia,this.Ta,3))1<this.la?Wd(this,this.Ra*this.Fa):(this.gc=this.H.createImageData(b,c),this.lc=16/this.Qa|0,Wd(this,this.Ta>>1)),this.L=document.createElement("canvas"),this.L.width=b,this.L.height=c,this.bb=
+this.L.getContext("2d"),this.ra={},this.za=1<<this.Qa,this.ua=Array(this.za+2),this.ua[0]=[0,0,0,255],this.ua[1]=[255,255,255,255],1==this.da&&(this.ua[this.za+0]=[255,255,0,255],this.ua[this.za+1]=[0,255,0,255]),2==this.da&&(this.hd=60,this.sb=!1,this.wa=Array(this.Ra));if(this.ca=nb(a,"Keyboard")){for(var e in this.tb)this.ca.ma("led",e,this.tb[e]);this.T&&this.ca.ma(this.kd?"textarea":"canvas","kbd",this.ya)}this.ea||E(this)};
+function Vd(a,b,c,d){if(d)a.fa("Unable to load font ROM (error "+d+": "+b+")");else{Ya(a.Qb,b,c);try{var e=eval("("+c+")"),f=e.bytes||e;if(!f||!f.length){w("Empty font ROM: "+b);return}if(1==f.length){w(f[0]);return}if(2048==f.length)Xd(a,f);else{a.fa("Unrecognized font data length ("+f.length+")");return}}catch(h){a.fa("Font ROM data error: "+h.message);return}(a.H||a.G)&&E(a)}}
+function Xd(a,b){a.ab=b;a.ra[96]=[Yd(a,a.la,a.ga),Yd(a,a.la,a.ga,a.sb)];a.ra[64]=[Yd(a,2*a.la,a.ga),Yd(a,2*a.la,a.ga,a.sb)];a.ra[32]=a.ra[0]=[Yd(a,2*a.la,2*a.ga),Yd(a,2*a.la,2*a.ga,a.sb)]}
+function Yd(a,b,c,d){var e=8>=a.cd?8:16,f=8<e?15:0,h=a.ab.length/e,g=!1===d,k={la:b,ga:c};k.canvas=document.createElement("canvas");k.canvas.width=16*b;k.canvas.height=h/16*c;k.context=k.canvas.getContext("2d");for(var l=k.context.createImageData(b,c),n=0;n<h;n++){for(var p=0,v=p;p<a.ga;p++)for(var u=n*e+(f+p&e-1),u=d&&8==p?255:a.ab[u],q=0;q<c/a.ga;q++){for(var B=0,x=B;B<a.la;B++)for(var F=u&128>>(7<B?7:B),y=0;y<b/a.la;y++)g&&(F=!F),Zd(a,l,x,v,F?1:0),x++;v++}k.context.putImageData(l,(n&15)*b,(n>>
+4)*c)}return k}Rd.prototype.Ca=function(){return!0};Rd.prototype.ma=function(a,b,c){var d=this;if("led"==a||"rled"==a)return this.tb[b]=c,!0;switch(b){case "fullScreen":return this.K[b]=c,this.w&&this.w.cb?c.onclick=function(){d.cb()}:c.parentNode.removeChild(c),!0}return!1};
+Rd.prototype.cb=function(){var a=!1;if(this.w){if(this.w.cb){a="100%";if(screen&&screen.width&&screen.height){var b=screen.width/screen.height,c=this.Y/this.W;b>c&&(a=Math.round(c/b*100)+"%")}this.fc?(this.T.style.width=a,this.T.style.width=a,this.T.style.display="block",this.T.style.margin="auto"):(this.w.style.width=a,this.w.style.height="auto");this.w.style.backgroundColor="black";this.w.cb();a=!0}this.ya&&this.ya.focus()}return a};
+function Ud(a,b){!b&&a.w&&(a.fc?a.T.style.width=a.T.style.height="":a.w.style.width=a.w.style.height="");cb(a,"notifyFullScreen("+b+")",!0)}function Wd(a,b){a.hc=b;a.xa=!1;if(void 0===a.qa||a.qa.length!=a.hc)a.qa=Array(a.hc)}function Zd(a,b,c,d,e){d=a.F?(b.height-c-1)*b.width+d:c+d*b.width;e&&1==a.da&&(208<=c&&236>c?e=a.za+0:28<=c&&72>c&&(e=a.za+1));a=a.ua[e];d*=a.length;b.data[d]=a[0];b.data[d+1]=a[1];b.data[d+2]=a[2];b.data[d+3]=a[3]}
 Ha(function(){for(var a=C(document,"pc8080","video"),b=0;b<a.length;b++){var c=a[b],d=A(c),e=document.createElement("canvas");if(void 0===e||!e.getContext){c.innerHTML="<br/>Missing &lt;canvas&gt; support. Please try a newer web browser.";break}e.setAttribute("class","pcjs-canvas");e.setAttribute("width",d.screenWidth);e.setAttribute("height",d.screenHeight);e.style.backgroundColor=d.screenColor;e.style.height="auto";0<=pa().indexOf("MSIE")&&(c.onresize=function(a,b,c,d){return function(){b.style.height=
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-function $d(a){z.call(this,"Debugger",a,$d);this.style=ae;this.da=this.ya=this.L=0;this.W=Y();this.Ta=Y();this.F=-1;this.w=[];this.ia=!1;this.ha=Y();this.I=[];this.qa={};this.C=this.Y=this.H=[];be(this);this.va=0;ce(this);this.Ea=[];de(this,a.messages);this.Fa=a.commands;var b=this;window?void 0===window.$&&(window.$=function(a){return ee(b,a)}):void 0===global.$&&(global.$=function(a){return ee(b,a)})}Wa($d);
+function $d(a){z.call(this,"Debugger",a,$d);this.style=ae;this.ca=this.za=this.L=0;this.W=W();this.Ta=W();this.F=-1;this.w=[];this.ea=!1;this.da=W();this.I=[];this.qa={};this.C=this.Y=this.H=[];be(this);this.wa=0;ce(this);this.Fa=[];de(this,a.messages);this.Ia=a.commands;var b=this;window?void 0===window.$&&(window.$=function(a){return ee(b,a)}):void 0===global.$&&(global.$=function(a){return ee(b,a)})}Wa($d);
 var fe={"?":"help/print","a [#]":"assemble","b [#]":"breakpoint",c:"clear output","d [#]":"dump memory","e [#]":"edit memory",f:"frequencies","g [#]":"go [to #]",h:"halt","i [#]":"input port #","if":"eval expression",k:"stack trace",ln:"list nearest symbol(s)",m:"messages","o [#]":"output port #",p:"step over",print:"print expression",r:"dump/set registers",reset:"reset machine",s:"set options","t [#]":"trace","u [#]":"unassemble",v:"print version","var":"assign variable"},ae=8080,ge="NONE ACI ADC ADD ADI ANA ANI CALL CC CM CNC CNZ CP CPE CPO CZ CMA CMC CMP CPI DAA DAD DCR DCX DI EI HLT IN INR INX JMP JC JM JNC JNZ JP JPE JPO JZ LDA LDAX LHLD LXI MOV MVI NOP ORA ORI OUT PCHL POP PUSH RAL RAR RET RC RM RNC RNZ RP RPE RPO RZ RLC RRC RST SBB SBI SHLD SPHL STA STAX STC SUB SUI XCHG XRA XRI XTHL".split(" "),
 he="NONE ADC ADC ADD ADD AND AND CALL CALLC CALLS CALLNC CALLNZ CALLNS CALLP CALLNP CALLZ NOT CMC CMP CMP DAA ADD DEC DEC CLI STI HLT IN INC INC JMP JC JS JNC JNZ JNS JP JNP JZ MOV MOV MOV MOV MOV MOV NOP OR OR OUT JMP POP PUSH RCL RCR RET RETC RETS RETNC RETNZ RETNS RETP RETNP RETZ ROL ROR RST SBB SBB MOV MOV MOV MOV STC SUB SUB XCHG XOR XOR XCHG".split(" "),ie="B C D E H L M A BC DE HL SP PC PS PSW".split(" "),je=[[45],[42,2067,32],[71,2131,18193],[29,2067],[28,17],[22,17],[44,17,32],[63],[45,32768],
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@@ -127,91 +128,91 @@ he="NONE ADC ADC ADD ADD AND AND CALL CALLC CALLS CALLNC CALLNZ CALLNS CALLP CAL
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+function rf(a,b){if("?"==b)a.g("frequency commands:"),a.g("\tclear\tclear all frequency counts");else{var c,d=0;if(a.J)if("clear"==b){for(c=0;c<a.J.length;c++)a.J[c]=[c,0];a.g("frequency data cleared");d++}else if(void 0!==b)a.g("unknown frequency command: "+b),d++;else{var e=a.J.slice();e.sort(function(a,b){return b[1]-a[1]});var f=8086!=a.style?ge:he;for(c=0;c<e.length;c++){var h=e[c][0],g=e[c][1];g&&(a.g((f[a.Qa[h][0]]+"  ").substr(0,5)+" ("+("0x"+r(h,2))+"): "+g+" times"),d++)}}d||a.g("no frequency data available")}}
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 function uf(a,b){switch(b[1]){case "8080":a.style=ae;break;case "8086":a.style=8086;break;case "cs":var c;void 0!==b[3]&&(c=+b[3]);switch(b[2]){case "int":a.b.i.jb=c;break;case "start":a.b.i.vb=c;break;case "stop":a.b.i.lb=c;break;default:a.g("unknown cs option");return}void 0!==c&&hc(a.b);a.g("checksums "+(a.b.B.fb?"enabled":"disabled"));return;case "sp":void 0!==b[2]&&(xc(a.b,+b[2])||a.g("warning: using 1x multiplier, previous target not reached"));a.g("target speed: "+(a.b.i.Wa.toFixed(2)+"Mhz")+
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