From 59b6dd3be6ed61dfb1d2ba129a63d5664a6970b1 Mon Sep 17 00:00:00 2001
From: Jeff Parsons <Jeff@pcjs.org>
Date: Mon, 2 May 2016 09:01:06 -0700
Subject: [PATCH] Ported some PCjs drawing code to PC8080, still needs work
 though

---
 devices/pc8080/machine/invaders/machine.xml |   2 +-
 docs/pcjs/chipset/README.md                 |  21 +-
 docs/pcjs/component/README.md               |  22 +-
 docs/pcjs/computer/README.md                |  22 +-
 docs/pcjs/cpu/README.md                     |  32 +-
 docs/pcjs/debugger/README.md                |  24 +-
 docs/pcjs/examples/pc-dbg.js                |   2 +-
 docs/pcjs/examples/pc.js                    |   2 +-
 docs/pcjs/fdc/README.md                     |  38 +-
 docs/pcjs/hdc/README.md                     |  25 +-
 docs/pcjs/keyboard/README.md                |  21 +-
 docs/pcjs/machine/README.md                 |  20 +-
 docs/pcjs/mouse/README.md                   |  21 +-
 docs/pcjs/panel/README.md                   |  41 +-
 docs/pcjs/parallel/README.md                |  21 +-
 docs/pcjs/ram/README.md                     |  21 +-
 docs/pcjs/rom/README.md                     |  21 +-
 docs/pcjs/serial/README.md                  |  21 +-
 docs/pcjs/video/README.md                   |  60 ++-
 modules/pc8080/lib/cpusim.js                |  10 +-
 modules/pc8080/lib/video.js                 | 198 +++++++++-
 versions/pc8080/1.22.0/pc8080-dbg.js        | 390 ++++++++++----------
 versions/pc8080/1.22.0/pc8080.js            | 245 ++++++------
 23 files changed, 781 insertions(+), 499 deletions(-)

diff --git a/devices/pc8080/machine/invaders/machine.xml b/devices/pc8080/machine/invaders/machine.xml
index 7c9dc4ea4..c31302e53 100644
--- a/devices/pc8080/machine/invaders/machine.xml
+++ b/devices/pc8080/machine/invaders/machine.xml
@@ -9,7 +9,7 @@
 	<rom id="romF" addr="0x1000" size="0x0800" file="/devices/pc8080/rom/invaders/INVADERS-F.json"/>
 	<rom id="romE" addr="0x1800" size="0x0800" file="/devices/pc8080/rom/invaders/INVADERS-E.json"/>
 	<ram id="ram"  addr="0x2000" size="0x0400"/>
-	<video id="video" screenWidth="224" screenHeight="256" bufferAddr="0x2400" bufferCols="256" bufferRows="224" bufferBits="1" interruptRate="120" rotation="90" width="40%" pos="left" padding="8px">
+	<video id="video" screenWidth="896" screenHeight="1024" bufferAddr="0x2400" bufferCols="256" bufferRows="224" bufferBits="1" interruptRate="120" rotation="90" width="40%" pos="left" padding="8px">
 		<menu>
 			<title>224x256 Screen (Rotated)</title>
 		</menu>
diff --git a/docs/pcjs/chipset/README.md b/docs/pcjs/chipset/README.md
index 559a464de..b27344434 100644
--- a/docs/pcjs/chipset/README.md
+++ b/docs/pcjs/chipset/README.md
@@ -9,7 +9,9 @@ PCjs ChipSet Component
 
 Format
 ---
-	<chipset>...</chipset>
+```xml
+<chipset>...</chipset>
+```
 
 Purpose
 ---
@@ -103,15 +105,20 @@ Bindings
 
 Example
 ---
-	<chipset id="chipset" model="5150" sw1="01000001" sw2="11110000"/>
+```xml
+<chipset id="chipset" model="5150" sw1="01000001" sw2="11110000"/>
+```
 
 Output
 ---
-	<div id="..." class="pc-chipset pc-component">
-		<div class="pc-container">
-			<div class="pcjs-chipset" data-value="id:'...',name:'...',model:'...',sw1:'...',sw2:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-chipset pc-component">
+    <div class="pc-container">
+        <div class="pcjs-chipset" data-value="id:'...',name:'...',model:'...',sw1:'...',sw2:'...'">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/docs/pcjs/component/README.md b/docs/pcjs/component/README.md
index 7fe305ed3..49a584315 100644
--- a/docs/pcjs/component/README.md
+++ b/docs/pcjs/component/README.md
@@ -9,7 +9,9 @@ PCjs Component
 
 Format
 ---
-	<component>...</component>
+```xml
+<component>...</component>
+```
 
 Purpose
 ---
@@ -35,14 +37,20 @@ Attributes
 
 Example
 ---
-	<component id="ibm5150" class="pcjs" width="740px" pos="center" border="1">...</component>
+```xml
+<component id="ibm5150" class="pcjs" width="740px" pos="center" border="1">
+    ...
+</component>
+```
 
 Output
 ---
-	<div id="..." class="pc-component">
-		<div class="pc-container">
-			...
-		</div>
-	</div>
+```html
+<div id="..." class="pc-component">
+    <div class="pc-container">
+        ...
+    </div>
+</div>
+```
 
 [Return to [PCjs Documentation](..)]
diff --git a/docs/pcjs/computer/README.md b/docs/pcjs/computer/README.md
index c4bb60635..d94fa8910 100644
--- a/docs/pcjs/computer/README.md
+++ b/docs/pcjs/computer/README.md
@@ -9,7 +9,9 @@ PCjs Computer Component
 
 Format
 ---
-	<computer>...</computer>
+```xml
+<computer>...</computer>
+```
 
 Purpose
 ---
@@ -51,16 +53,20 @@ Bindings
 
 Example
 ---
-	<computer id="pc" name="IBM PC"/>
+```xml
+<computer id="pc" name="IBM PC"/>
+```
 
 Output
 ---
-	<div id="..." class="pc-computer pc-component" style="">
-		<div class="pc-container" style="">
-			<div class="pcjs-computer" data-value="id:'...',name:'...',resume:'...',state:'...'">
-			</div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-computer pc-component" style="">
+    <div class="pc-container" style="">
+        <div class="pcjs-computer" data-value="id:'...',name:'...',resume:'...',state:'...'">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/docs/pcjs/cpu/README.md b/docs/pcjs/cpu/README.md
index 3182ad96d..0b75edd5c 100644
--- a/docs/pcjs/cpu/README.md
+++ b/docs/pcjs/cpu/README.md
@@ -9,7 +9,9 @@ PCjs CPU Component
 
 Format
 ---
-	<cpu>...</cpu>
+```xml
+<cpu>...</cpu>
+```
 
 Purpose
 ---
@@ -19,7 +21,7 @@ Attributes
 ---
 * *model* (optional; default is 8088; supported values include: 8086, 8088, 80186, 80286, and 80386)
 	* Defines the CPU model, adjusting the CPU's capabilities accordingly.
-* *stepping* (optional; if specified, it must be a 2-character string, such as "A0" or "B1")
+* *stepping* (optional; if specified, it should be a 2-character string, such as "A0" or "B1")
 	* Defines the CPU stepping, adjusting the CPU's capabilities accordingly.
 	* Currently supported only on the 80386 model.
 * *cycles* (optional; default is 4772727)
@@ -44,26 +46,30 @@ Bindings
 	*[Computer](/docs/pcjs/computer/)* component, because every component is reset, but the CPU offers the binding
 	for convenience.
 * *speed*
-	* For use with any control with an *innerHTML* property, to display the current CPU speed.
+	* For use with any control with an *textContent* property, to display the current CPU speed.
 * *setSpeed*
 	* For use with a control of type *button*, to increase the CPU speed.
 * *AX*, *BX*, *CX*, *DX*, *SP*, *BP*, *SI*, *DI*, *CS*, *DS*, *SS*, *ES*, *PC*, *PS*, *C*, *P*, *A*, *Z*, *S*, *T*, *I*, *D*, *O*
-	* For use with any control with an *innerHTML* property, to display the corresponding register's contents.
+	* For use with any control with an *textContent* property, to display the corresponding register's contents.
 
 Example
 ---
-	<cpu id="cpu8088" model="8088" autoStart="true">
-		<control type="button" class="input" binding="run">Run</control>
-	</cpu>
+```xml
+<cpu id="cpu8088" model="8088" autoStart="true">
+    <control type="button" class="input" binding="run">Run</control>
+</cpu>
+```
 
 Output
 ---
-	<div id="..." class="pc-cpu pc-component" style="">
-		<div class="pc-container" style="">
-			<div class="pcjs-cpu" data-value="id:'...',name:'...',model:'...',cycles:'...',multiplier:'...',autoStart:'...'">
-			</div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-cpu pc-component" style="">
+    <div class="pc-container" style="">
+        <div class="pcjs-cpu" data-value="id:'...',name:'...',model:'...',cycles:'...',multiplier:'...',autoStart:'...'">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/docs/pcjs/debugger/README.md b/docs/pcjs/debugger/README.md
index abff936c4..fd7ca9b3e 100644
--- a/docs/pcjs/debugger/README.md
+++ b/docs/pcjs/debugger/README.md
@@ -9,7 +9,9 @@ PCjs Debugger Component
 
 Format
 ---
-	<debugger>...</debugger>
+```xml
+<debugger>...</debugger>
+```
 
 Purpose
 ---
@@ -17,7 +19,7 @@ Creates an instance of the Debugger component.
 
 Attributes
 ---
-* *message* (optional)
+* *messages* (optional)
 	* One or more message categories to enable, separated by |. By default, all message categories are disabled.
 	See the Debugger's "m" command for a current list of message categories.
 
@@ -40,16 +42,20 @@ Use the Debugger's built-in help for a list of commands.
 
 Example
 ---
-	<debugger/>
+```xml
+<debugger/>
+```
 
 Output
 ---
-	<div id="..." class="pc-debugger pc-component" style="">
-		<div class="pc-container" style="">
-			<div class="pcjs-debugger" data-value="id:'...',name:'...',message:'...'">
-			</div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-debugger pc-component" style="">
+    <div class="pc-container" style="">
+        <div class="pcjs-debugger" data-value="id:'...',name:'...',messages:'...'">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/docs/pcjs/examples/pc-dbg.js b/docs/pcjs/examples/pc-dbg.js
index fb59e13bd..4e85aad06 100644
--- a/docs/pcjs/examples/pc-dbg.js
+++ b/docs/pcjs/examples/pc-dbg.js
@@ -624,7 +624,7 @@ function Ip(a){a.xb++;a.xb>=a.Of+1&&(a.xb=1,a.kb++,a.kb>=a.Nf&&(a.kb=0,a.Qb++))}
 function Kp(a){Ua.call(this,"HDC",a,Kp,1048576);this.dmaRead=this.yk;this.dmaWrite=this.zk;this.dmaWriteBuffer=this.Mk;this.dmaWriteFormat=this.Nk;this.ua=[];this.Fa=a.drives;this.ja="at"==a.type}db(Kp);
 var Lp=["XTC","ATC","COMPAQ"],Mp=[{0:[306,2],1:[375,8],2:[306,6],3:[306,4]},{1:[306,4],2:[615,4],3:[615,6],4:[940,8],5:[940,6],6:[615,4],7:[462,8],8:[733,5],9:[900,15],10:[820,3],11:[855,5],12:[855,7],13:[306,8],14:[733,7],16:[612,4],17:[977,5],18:[977,7],19:[1024,7],20:[733,5],21:[733,7],22:[733,5],23:[306,4]},{1:[306,4],2:[615,4],3:[615,6],4:[1023,8],5:[940,6],6:[697,5],7:[462,8],8:[925,5],9:[900,15],10:[980,5],11:[925,7],12:[925,9],13:[612,8],14:[980,4],16:[612,4],17:[980,5],18:[966,6],19:[1023,
 8],20:[733,5],21:[733,7],22:[524,4,40],23:[924,8],24:[966,14],25:[966,16],26:[1023,14],27:[832,6,33],28:[1222,15,34],29:[1240,7,34],30:[615,4,25],31:[615,8,25],32:[905,9,25],33:[832,8,33],34:[966,7,34],35:[966,8,34],36:[966,9,34],37:[966,5,34],38:[612,16,63],39:[1023,11,33],40:[1023,15,34],41:[1630,15,52],42:[1023,16,63],43:[805,4,26],44:[805,2,26],45:[748,8,33],46:[748,6,33],47:[966,5,25]}];m=Kp.prototype;
-m.Pb=function(a,b,c){var d=this;switch(b){case "saveHD0":case "saveHD1":return this.qa[b]=c,c.onclick=function(a){return function(){var b=d.A&&d.A[a];b&&b.za?(b=b.za,b=Ia(pp(b),"octet-stream",!0,b.Ng.replace(".json",".img")),w(b)):d.Na("Hard disk "+a+" is not available.")}}(+b.slice(-1)),!0}return!1};
+m.Pb=function(a,b,c){var d=this;switch(b){case "saveHD0":case "saveHD1":return this.qa[b]=c,c.onclick=function(a){return function(){var b=d.A&&d.A[a];b&&b.za?(b=b.za,b=Ia(pp(b),"octet-stream",!0,b.Ng.replace(".json",".img")),w(b)):d.Na("Hard drive "+a+" is not available.")}}(+b.slice(-1)),!0}return!1};
 m.Ic=function(a,b,c,d){this.ea=b;this.F=c;this.ha=d;this.V=a;if(d=Nc(a,"drives"))this.ua=d;else if(this.Fa)try{this.ua=eval("("+this.Fa+")")}catch(e){w("HDC drive configuration error: "+e.message+" ("+this.Fa+")")}this.N=Eb(a,"ChipSet");this.U=0;this.Ia=3;hc(b,this,this.ja?Np:Op);lc(b,this,this.ja?Pp:Qp);this.ja&&(this.U++,this.N&&5180==this.N.ia&&this.U++,this.Ia=2,b.aa[496]=2,b.fa[496]=2);Te(c,19,this.Zl.bind(this));Te(c,64,this.$l.bind(this));this.reset();Rp(this)||rb(this)};
 m.ic=function(a,b){if(!b)if(!a||!this.restore)Sp(this),this.V.dh&&Rp(this,!0);else if(!this.restore(a))return!1;return!0};m.hc=function(a){return a?this.save():!0};m.ff=function(){return this.V?this.V.ff():""};m.ke=function(){return this.V?this.V.ke():""};m.reset=function(){Sp(this,null,!0)};
 m.save=function(){var a=new hf(this),b=0,c=[];this.ja?(c[b++]=this.X,c[b++]=this.Pa,c[b++]=this.aa,c[b++]=this.Ca,c[b++]=this.ya,c[b++]=this.wa,c[b++]=this.ra,c[b++]=this.ma,c[b++]=this.Ea,c[b++]=[this.ga,this.hb]):(c[b++]=this.pa,c[b++]=this.ma,c[b++]=this.W,c[b++]=this.L,c[b++]=this.C,c[b++]=this.Oa,c[b++]=this.Ka,c[b++]=this.Ja,c[b++]=this.ka);for(var d=0,e=[],f=0;f<this.A.length;f++){var g=d++,h=this.A[f],k=0,l=[];l[k++]=h.errorCode;l[k++]=h.mk;l[k++]=h.bf;l[k++]=h.Qe;l[k++]=h.Re;l[k++]=h.kb;
diff --git a/docs/pcjs/examples/pc.js b/docs/pcjs/examples/pc.js
index f81aafd08..9982258cd 100644
--- a/docs/pcjs/examples/pc.js
+++ b/docs/pcjs/examples/pc.js
@@ -570,7 +570,7 @@ function Im(a){a.mb++;a.mb>=a.Ve+1&&(a.mb=1,a.Ya++,a.Ya>=a.Ue&&(a.Ya=0,a.wb++))}
 function Z(a){Ia.call(this,"HDC",a,Z);this.dmaRead=this.sj;this.dmaWrite=this.tj;this.dmaWriteBuffer=this.Dj;this.dmaWriteFormat=this.Ej;this.ia=[];this.qa=a.drives;this.W="at"==a.type}Qa(Z);
 var Km=["XTC","ATC","COMPAQ"],Lm=[{0:[306,2],1:[375,8],2:[306,6],3:[306,4]},{1:[306,4],2:[615,4],3:[615,6],4:[940,8],5:[940,6],6:[615,4],7:[462,8],8:[733,5],9:[900,15],10:[820,3],11:[855,5],12:[855,7],13:[306,8],14:[733,7],16:[612,4],17:[977,5],18:[977,7],19:[1024,7],20:[733,5],21:[733,7],22:[733,5],23:[306,4]},{1:[306,4],2:[615,4],3:[615,6],4:[1023,8],5:[940,6],6:[697,5],7:[462,8],8:[925,5],9:[900,15],10:[980,5],11:[925,7],12:[925,9],13:[612,8],14:[980,4],16:[612,4],17:[980,5],18:[966,6],19:[1023,
 8],20:[733,5],21:[733,7],22:[524,4,40],23:[924,8],24:[966,14],25:[966,16],26:[1023,14],27:[832,6,33],28:[1222,15,34],29:[1240,7,34],30:[615,4,25],31:[615,8,25],32:[905,9,25],33:[832,8,33],34:[966,7,34],35:[966,8,34],36:[966,9,34],37:[966,5,34],38:[612,16,63],39:[1023,11,33],40:[1023,15,34],41:[1630,15,52],42:[1023,16,63],43:[805,4,26],44:[805,2,26],45:[748,8,33],46:[748,6,33],47:[966,5,25]}];l=Z.prototype;
-l.zb=function(a,b,c){var d=this;switch(b){case "saveHD0":case "saveHD1":return this.ka[b]=c,c.onclick=function(a){return function(){var b=d.B&&d.B[a];b&&b.ta?(b=b.ta,b=za(pm(b),"octet-stream",!0,b.nh.replace(".json",".img")),n(b)):d.Ba("Hard disk "+a+" is not available.")}}(+b.slice(-1)),!0}return!1};
+l.zb=function(a,b,c){var d=this;switch(b){case "saveHD0":case "saveHD1":return this.ka[b]=c,c.onclick=function(a){return function(){var b=d.B&&d.B[a];b&&b.ta?(b=b.ta,b=za(pm(b),"octet-stream",!0,b.nh.replace(".json",".img")),n(b)):d.Ba("Hard drive "+a+" is not available.")}}(+b.slice(-1)),!0}return!1};
 l.pc=function(a,b,c,d){this.ha=b;this.A=c;this.Ia=d;this.ba=a;if(d=jc(a,"drives"))this.ia=d;else if(this.qa)try{this.ia=eval("("+this.qa+")")}catch(e){n("HDC drive configuration error: "+e.message+" ("+this.qa+")")}this.P=kb(a,"ChipSet");this.H=0;this.ra=3;Nb(b,this,this.W?Mm:Nm);Pb(b,this,this.W?Om:Pm);this.W&&(this.H++,this.P&&5180==this.P.ca&&this.H++,this.ra=2,b.P[496]=2,b.R[496]=2);Yd(c,19,this.Rk.bind(this));Yd(c,64,this.Sk.bind(this));this.reset();Qm(this)||ab(this)};
 l.Vb=function(a,b){if(!b)if(!a||!this.restore)Rm(this),this.ba.jg&&Qm(this,!0);else if(!this.restore(a))return!1;return!0};l.Ub=function(a){return a?this.save():!0};l.se=function(){return this.ba?this.ba.se():""};l.Ad=function(){return this.ba?this.ba.Ad():""};l.reset=function(){Rm(this,null,!0)};
 l.save=function(){var a=new be(this),b=0,c=[];this.W?(c[b++]=this.K,c[b++]=this.za,c[b++]=this.L,c[b++]=this.oa,c[b++]=this.ma,c[b++]=this.la,c[b++]=this.Z,c[b++]=this.aa,c[b++]=this.pa,c[b++]=[this.R,this.Qa]):(c[b++]=this.da,c[b++]=this.aa,c[b++]=this.I,c[b++]=this.G,c[b++]=this.D,c[b++]=this.xa,c[b++]=this.va,c[b++]=this.ua,c[b++]=this.Y);for(var d=0,e=[],f=0;f<this.B.length;f++){var g=d++,h=this.B[f],k=0,m=[];m[k++]=h.errorCode;m[k++]=h.jj;m[k++]=h.oe;m[k++]=h.de;m[k++]=h.ee;m[k++]=h.Ya;m[k++]=
diff --git a/docs/pcjs/fdc/README.md b/docs/pcjs/fdc/README.md
index 3cc8f2c6f..ba3953b4a 100644
--- a/docs/pcjs/fdc/README.md
+++ b/docs/pcjs/fdc/README.md
@@ -9,7 +9,9 @@ PCjs Floppy Drive Controller (FDC) Component
 
 Format
 ---
-	<fdc>...</fdc>
+```xml
+<fdc>...</fdc>
+```
 
 Purpose
 ---
@@ -53,24 +55,28 @@ Bindings
 
 Example
 ---
-	<fdc id="fdcNEC" autoMount="'{A: {name: "PC-DOS 1.0", path: "pcdos-1.00.json"}}'">
-    	<control type="container">
-    		<control type="list" class="input" binding="listDrives"/>
-    		<control type="list" class="input" binding="listDisks">
-    			<disk path="">None</disk>
-    			<disk path="pcdos-1.00.json">PC-DOS 1.0</disk>
-    		</control>
-    		<control type="button" class="input" binding="loadDrive">Load Drive</control>
-    	</control>
-    </fdc>
+```xml
+<fdc id="fdcNEC" autoMount="'{A: {name: "PC-DOS 1.0", path: "pcdos-1.00.json"}}'">
+    <control type="container">
+        <control type="list" class="input" binding="listDrives"/>
+        <control type="list" class="input" binding="listDisks">
+            <disk path="pcdos-1.00.json">PC-DOS 1.0</disk>
+        </control>
+        <control type="button" class="input" binding="loadDrive">Load Drive</control>
+    </control>
+</fdc>
+```
 
 Output
 ---
-	<div id="..." class="pc-fdc pc-component">
-		<div class="pc-container">
-			<div class="pcjs-fdc" data-value="id:'...',name:'...',listDrives:'...',listDisks:'...',loadDrive:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-fdc pc-component">
+    <div class="pc-container">
+        <div class="pcjs-fdc" data-value="id:'...',name:'...',listDrives:'...',listDisks:'...',loadDrive:'...'">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/docs/pcjs/hdc/README.md b/docs/pcjs/hdc/README.md
index 451796549..42699c694 100644
--- a/docs/pcjs/hdc/README.md
+++ b/docs/pcjs/hdc/README.md
@@ -9,7 +9,9 @@ PCjs Hard Drive Controller (HDC) Component
 
 Format
 ---
-	<hdc>...</hdc>
+```xml
+<hdc>...</hdc>
+```
 
 Purpose
 ---
@@ -46,11 +48,15 @@ Attributes
 	
 	For the Xebec (*'xt'*) controller, you should install the Xebec ROM; eg:
 	
+		```xml
 		<rom id="romHDC" addr="0xc8000" size="0x2000" file="/devices/pc/hdc/ibm-xebec-1982.json"/>
+		```
 
 	For the Western Digital (*'at'*) controller, use a Model 5170 (or newer) ROM module; eg:
 
+		```xml
 		<rom id="romBIOS" addr="0xf0000" size="0x10000" alias="0xff0000" file="/devices/pc/rom/5170/1984-01-10/1984-01-10.json"/>
+		```
 
 	The default *type* setting is *'xt'*.
 
@@ -62,15 +68,20 @@ This component has no bindings. Fixed disks cannot be loaded or unloaded once th
 
 Example
 ---
-	<hdc id="hdcXT" drives="[{name:'10Mb Hard Drive',type:3}]"/>
+```xml
+<hdc id="hdcXT" drives="[{name:'10Mb Hard Drive',type:3}]"/>
+```
 
 Output
 ---
-	<div id="..." class="pc-hdc pc-component">
-		<div class="pc-container">
-			<div class="pcjs-hdc" data-value="id:'...',name:'...',drives:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-hdc pc-component">
+    <div class="pc-container">
+        <div class="pcjs-hdc" data-value="id:'...',name:'...',drives:'...'">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/docs/pcjs/keyboard/README.md b/docs/pcjs/keyboard/README.md
index 8810d9fbd..a4b21669a 100644
--- a/docs/pcjs/keyboard/README.md
+++ b/docs/pcjs/keyboard/README.md
@@ -9,7 +9,9 @@ PCjs Keyboard Component
 
 Format
 ---
-	<keyboard>...</keyboard>
+```xml
+<keyboard>...</keyboard>
+```
 
 Purpose
 ---
@@ -41,18 +43,23 @@ for the specified model.
 
 Example
 ---
-	<keyboard id="keyboard" model="us83"/>
+```xml
+<keyboard id="keyboard" model="us83"/>
+```
 
 See [/devices/pc/keyboard/us83-softkeys.xml](/devices/pc/keyboard/us83-softkeys.xml) for an example that provides a
 complete "soft keyboard".
 
 Output
 ---
-	<div id="..." class="pc-keyboard pc-component">
-		<div class="pc-container">
-			<div class="pcjs-keyboard" data-value="id:'...',name:'...',model:'...',sw1:'...',sw2:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-keyboard pc-component">
+    <div class="pc-container">
+        <div class="pcjs-keyboard" data-value="id:'...',name:'...',model:'...',sw1:'...',sw2:'...'">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/docs/pcjs/machine/README.md b/docs/pcjs/machine/README.md
index 8c651303d..0784a6a36 100644
--- a/docs/pcjs/machine/README.md
+++ b/docs/pcjs/machine/README.md
@@ -9,7 +9,9 @@ PCjs Machine Component
 
 Format
 ---
-	<machine>...</machine>
+```xml
+<machine>...</machine>
+```
 
 Purpose
 ---
@@ -32,14 +34,18 @@ None.
 
 Example
 ---
-	<machine id="ibm5150" class="pcjs" width="740px" pos="center" border="1" style="background-color:#FAEBD7">...</machine>
+```xml
+<machine id="ibm5150" class="pcjs" width="740px" pos="center" border="1" style="background-color:#FAEBD7">...</machine>
+```
 
 Output
 ---
-	<div id="..." class="pc-machine pc-component" style="">
-		<div class="pc-container" style="">
-			...
-		</div>
-	</div>
+```html
+<div id="..." class="pc-machine pc-component" style="">
+    <div class="pc-container" style="">
+        ...
+    </div>
+</div>
+```
 
 [Return to [PCjs Documentation](..)]
diff --git a/docs/pcjs/mouse/README.md b/docs/pcjs/mouse/README.md
index 228dd77a8..65524c5ba 100644
--- a/docs/pcjs/mouse/README.md
+++ b/docs/pcjs/mouse/README.md
@@ -9,7 +9,9 @@ PCjs Mouse Component
 
 Format
 ---
-	<mouse>...</mouse>
+```xml
+<mouse>...</mouse>
+```
 
 Purpose
 ---
@@ -30,14 +32,19 @@ None.
 
 Example
 ---
-	<mouse serial="com1"/>
+```xml
+<mouse serial="com1"/>
+```
 
 Output
 ---
-	<div id="..." class="pc-mouse pc-component">
-		<div class="pc-container">
-			<div class="pcjs-mouse" data-value="id:'...',name:'...',serial:'...'></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-mouse pc-component">
+    <div class="pc-container">
+        <div class="pcjs-mouse" data-value="id:'...',name:'...',serial:'...'>
+        </div>
+    </div>
+</div>
+```
 
 [Return to [PCjs Documentation](..)]
diff --git a/docs/pcjs/panel/README.md b/docs/pcjs/panel/README.md
index 46e6bb84d..aa0c1cc84 100644
--- a/docs/pcjs/panel/README.md
+++ b/docs/pcjs/panel/README.md
@@ -9,7 +9,9 @@ PCjs Control Panel Component
 
 Format
 ---
-	<panel>...</panel>
+```xml
+<panel>...</panel>
+```
 
 Purpose
 ---
@@ -28,27 +30,32 @@ and [Debugger](/docs/pcjs/debugger/) components.
 
 Example
 ---
-	<panel id="panel" pos="center" width="900px" padleft="8px">
-		<name>Control Panel</name>
-		<control type="container" width="500px" pos="left" padbottom="10px">
-			<control type="textarea" class="output" binding="print" width="480px" height="200px"/>
-			<control type="container">
-				<control type="text" class="input" binding="debugInput" width="360px"/>
-				<control type="button" class="input" binding="debugEnter">Enter</control>
-				<control type="button" class="input" binding="clear">Clear</control>
-			</control>
-		</control>
-	</panel>
+```xml
+<panel id="panel" pos="center" width="900px" padleft="8px">
+    <name>Control Panel</name>
+    <control type="container" width="500px" pos="left" padbottom="10px">
+        <control type="textarea" class="output" binding="print" width="480px" height="200px"/>
+        <control type="container">
+            control type="text" class="input" binding="debugInput" width="360px"/>
+            <control type="button" class="input" binding="debugEnter">Enter</control>
+            <control type="button" class="input" binding="clear">Clear</control>
+        </control>
+    </control>
+</panel>
+```
 
 See [/devices/pc/panel/default.xml](/devices/pc/panel/default.xml) for a more complete example.
 
 Output
 ---
-	<div id="..." class="pc-panel pc-component">
-		<div class="pc-container">
-			<div class="pcjs-panel" data-value="id:'...',name:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-panel pc-component">
+    <div class="pc-container">
+        <div class="pcjs-panel" data-value="id:'...',name:'...'">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/docs/pcjs/parallel/README.md b/docs/pcjs/parallel/README.md
index 2f7e94887..28ae438c2 100644
--- a/docs/pcjs/parallel/README.md
+++ b/docs/pcjs/parallel/README.md
@@ -9,7 +9,9 @@ PCjs ParallelPort Component
 
 Format
 ---
-	<parallel>...</parallel>
+```xml
+<parallel>...</parallel>
+```
 
 Purpose
 ---
@@ -39,14 +41,19 @@ Bindings
 
 Example
 ---
-	<parallel id="lpt1" adapter="2" binding="print"/>
+```xml
+<parallel id="lpt1" adapter="2" binding="print"/>
+```
 
 Output
 ---
-	<div id="..." class="pc-parallel pc-component">
-		<div class="pc-container">
-			<div class="pcjs-parallel" data-value="id:'...',name:'...',adapter:'...',binding:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-parallel pc-component">
+    <div class="pc-container">
+        <div class="pcjs-parallel" data-value="id:'...',name:'...',adapter:'...',binding:'...'">
+        </div>
+    </div>
+</div>
+```
 
 [Return to [PCjs Documentation](..)]
diff --git a/docs/pcjs/ram/README.md b/docs/pcjs/ram/README.md
index 726b4d02e..5984b7975 100644
--- a/docs/pcjs/ram/README.md
+++ b/docs/pcjs/ram/README.md
@@ -9,7 +9,9 @@ PCjs Random-Access Memory (RAM) Component
 
 Format
 ---
-	<ram>...</ram>
+```xml
+<ram>...</ram>
+```
 
 Purpose
 ---
@@ -43,15 +45,20 @@ Bindings
 
 Example
 ---
-	<ram id="ramLow" addr="0x00000"/>
+```xml
+<ram id="ramLow" addr="0x00000"/>
+```
 
 Output
 ---
-	<div id="..." class="pc-ram pc-component">
-		<div class="pc-container">
-			<div class="pcjs-ram" data-value="id:'...',name:'...',addr:'...',size:'...',test:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-ram pc-component">
+    <div class="pc-container">
+        <div class="pcjs-ram" data-value="id:'...',name:'...',addr:'...',size:'...',test:'...'">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/docs/pcjs/rom/README.md b/docs/pcjs/rom/README.md
index 9f6f925d4..9f311186b 100644
--- a/docs/pcjs/rom/README.md
+++ b/docs/pcjs/rom/README.md
@@ -9,7 +9,9 @@ PCjs Read-Only Memory (ROM) Component
 
 Format
 ---
-	<rom>...</rom>
+```xml
+<rom>...</rom>
+```
 
 Purpose
 ---
@@ -43,14 +45,19 @@ None.
 
 Example
 ---
-	<rom id="romBIOS" addr="0xfe000" size="0x02000" file="/devices/pc/rom/5150/bios/1981-04-24.json"/>
+```xml
+<rom id="romBIOS" addr="0xfe000" size="0x02000" file="/devices/pc/rom/5150/bios/1981-04-24.json"/>
+```
 
 Output
 ---
-	<div id="..." class="pc-rom pc-component">
-		<div class="pc-container">
-			<div class="pcjs-rom" data-value="id:'...',name:'...',addr:'...',size:'...',test:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-rom pc-component">
+    <div class="pc-container">
+        <div class="pcjs-rom" data-value="id:'...',name:'...',addr:'...',size:'...',test:'...'">
+        </div>
+    </div>
+</div>
+```
 
 [Return to [PCjs Documentation](..)]
diff --git a/docs/pcjs/serial/README.md b/docs/pcjs/serial/README.md
index 0f6c0837d..5c799f32d 100644
--- a/docs/pcjs/serial/README.md
+++ b/docs/pcjs/serial/README.md
@@ -9,7 +9,9 @@ PCjs SerialPort Component
 
 Format
 ---
-	<serial>...</serial>
+```xml
+<serial>...</serial>
+```
 
 Purpose
 ---
@@ -39,14 +41,19 @@ Bindings
 
 Example
 ---
-	<serial id="com1" adapter="1" binding="print"/>
+```xml
+<serial id="com1" adapter="1" binding="print"/>
+```
 
 Output
 ---
-	<div id="..." class="pc-serial pc-component">
-		<div class="pc-container">
-			<div class="pcjs-serial" data-value="id:'...',name:'...',adapter:'...',binding:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-serial pc-component">
+    <div class="pc-container">
+        <div class="pcjs-serial" data-value="id:'...',name:'...',adapter:'...',binding:'...'">
+        </div>
+    </div>
+</div>
+```
 
 [Return to [PCjs Documentation](..)]
diff --git a/docs/pcjs/video/README.md b/docs/pcjs/video/README.md
index 2770db62f..6a7d5512c 100644
--- a/docs/pcjs/video/README.md
+++ b/docs/pcjs/video/README.md
@@ -9,7 +9,9 @@ PCjs Video Component
 
 Format
 ---
-	<video>...</video>
+```xml
+<video>...</video>
+```
 
 Purpose
 ---
@@ -22,24 +24,6 @@ Creates an instance of the Video component. This component is responsible for:
 
 Attributes
 ---
- * *addr* (required)
- 
-	The ROM starting address (e.g., 0xfe000).
-	
- * *size* (required)
- 
-	The length of ROM, in bytes (e.g., 0x02000 for an 8Kb ROM). This must match the length of the ROM image file.
-	
- * *file* (required)
- 
-	URL of the ROM image file to load at the specified addr.
-	
- * *notify* (optional)
- 
-	The *id* of a component to notify when *file* has been loaded. For example, the Video	component may need
-	to know when an external video ROM has been loaded. Any component can load its own files, including ROM image files,
-	but it's simpler to use the ROM component and request notification.
-
  * *model* (optional)
 
 	* "mda" (Monochrome Display Adapter)
@@ -49,17 +33,13 @@ Attributes
 	If *model* is not set, the SW1 switch block settings from the [ChipSet](/docs/pcjs/chipset/) component will
 	determine the video model to use ("mda" or "cga" only).
 	
- * *scale* (optional; default is false)
- 
-	true scales text modes to fill the canvas;  
-	false centers text modes on the canvas (this generally provides the sharpest rendering).
-	
- *  *screenwidth*, *screenheight* (required)
+ *  *screenWidth*, *screenHeight* (required)
  
 	The width and height of the canvas, in pixels (these are numbers, not style attributes, so do not include
-	a "px" suffix).
+	a "px" suffix); the canvas resolution does not need to match the *model* resolution (in fact, it should probably
+	be closer to the resolution of modern monitors, but still proportional to the resolution of the *model* being used).
 	
- * *fontrom* (formerly *charset*; required for models "mda" and "cga")
+ * *fontROM* (formerly *charset*; required for models "mda" and "cga")
  
 	The name of a character generator (font ROM) file. The MDA and CGA adapters did not contain a separate
 	system ROM, but they did contain on-board font data in ROM that the adapter used internally to generate character
@@ -67,6 +47,11 @@ Attributes
 	
 	The EGA uses font data stored in its system ROM, which is loaded by the ROM component, so do not use this
 	setting with model "ega".
+
+ * *scale* (optional; default is false)
+ 
+	true scales text modes to fill the canvas;  
+	false centers text modes on the canvas (this generally provides the sharpest rendering).
 	
 Also supports the attributes of *[Component](/docs/pcjs/component/)*.
 
@@ -79,17 +64,22 @@ Bindings
 
 Example
 ---
-	<video id="videoMDA" screenwidth="720" screenheight="350" scale="true" fontrom="ibm-mda-cga.json">
-    	<name>Monochrome Display</name>
-    </video>
+```xml
+<video id="videoMDA" screenWidth="720" screenHeight="350" fontROM="ibm-mda-cga.json" scale="true">
+    <name>Monochrome Display</name>
+</video>
+```
 
 Output
 ---
-	<div id="..." class="pc-video pc-component">
-		<div class="pc-container">
-			<div class="pcjs-video" data-value="id:'...',name:'...',addr:'...',size:'...',test:'...'"></div>
-		</div>
-	</div>
+```html
+<div id="..." class="pc-video pc-component">
+    <div class="pc-container">
+        <div class="pcjs-video" data-value="...">
+        </div>
+    </div>
+</div>
+```
 
 Also, if any controls are defined, another &lt;div&gt; of class="pc-controls" is created in the container &lt;div&gt;,
 with each control inside a &lt;div&gt; of class="pc-control".
diff --git a/modules/pc8080/lib/cpusim.js b/modules/pc8080/lib/cpusim.js
index d707fb6e8..ceca098d8 100644
--- a/modules/pc8080/lib/cpusim.js
+++ b/modules/pc8080/lib/cpusim.js
@@ -1091,11 +1091,11 @@ CPUSim.prototype.updateStatus = function(fForce)
             this.updateReg("PC", this.getPC(), 4);
             var regPS = this.getPS();
             this.updateReg("PS", regPS, 4);
-            this.updateReg("SF", (regPS & CPUDef.PS.SF), 1);
-            this.updateReg("ZF", (regPS & CPUDef.PS.ZF), 1);
-            this.updateReg("AF", (regPS & CPUDef.PS.AF), 1);
-            this.updateReg("PF", (regPS & CPUDef.PS.PF), 1);
-            this.updateReg("CF", (regPS & CPUDef.PS.CF), 1);
+            this.updateReg("SF", (regPS & CPUDef.PS.SF)? 1 : 0, 1);
+            this.updateReg("ZF", (regPS & CPUDef.PS.ZF)? 1 : 0, 1);
+            this.updateReg("AF", (regPS & CPUDef.PS.AF)? 1 : 0, 1);
+            this.updateReg("PF", (regPS & CPUDef.PS.PF)? 1 : 0, 1);
+            this.updateReg("CF", (regPS & CPUDef.PS.CF)? 1 : 0, 1);
         }
     }
     var controlSpeed = this.bindings["speed"];
diff --git a/modules/pc8080/lib/video.js b/modules/pc8080/lib/video.js
index d33645db4..85cb3d923 100644
--- a/modules/pc8080/lib/video.js
+++ b/modules/pc8080/lib/video.js
@@ -55,7 +55,7 @@ if (NODE) {
  *      bufferAddr: the starting address of the frame buffer (eg, 0x2400)
  *      bufferCols: the width of a single frame buffer row, in pixels (eg, 256)
  *      bufferRows: the number of frame buffer rows (eg, 224)
- *      bufferBits: the number of bits per pixel (eg, 1)
+ *      bufferBits: the number of bits per pixel (default is 1 if omitted)
  *      interruptRate: normally the same as (or some multiple of) the refreshRate (eg, 120)
  *      refreshRate: how many times updateScreen() should be called per second (eg, 60)
  *
@@ -75,9 +75,35 @@ if (NODE) {
 function Video(parmsVideo, canvas, context, textarea, container)
 {
     Component.call(this, "Video", parmsVideo, Video, Messages.VIDEO);
+
+    this.cxScreen = parmsVideo['screenWidth'];
+    this.cyScreen = parmsVideo['screenHeight'];
+
+    this.addrBuffer = parmsVideo['bufferAddr'];
+    this.cxBuffer = parmsVideo['bufferCols'];
+    this.cyBuffer = parmsVideo['bufferRows'];
+    this.nBitsPerPixel = parmsVideo['bufferBits'] || 1;
+
     this.interruptRate = parmsVideo['interruptRate'];
     this.refreshRate = parmsVideo['refreshRate'] || 60;
-    this.setReady();
+
+    this.canvasScreen = canvas;
+    this.contextScreen = context;
+    this.textareaScreen = textarea;
+    this.inputScreen = textarea || canvas || null;
+
+    this.initColors();
+
+    /*
+     * Allocate off-screen buffers.
+     *
+     * TODO: Do this only if there is a mismatch between the screen's (canvas) dimensions and the frame buffer's.
+     */
+    this.imageBuffer = this.contextScreen.createImageData(this.cxBuffer, this.cyBuffer);
+    this.canvasBuffer = document.createElement("canvas");
+    this.canvasBuffer.width = this.cxBuffer;
+    this.canvasBuffer.height = this.cyBuffer;
+    this.contextBuffer = this.canvasBuffer.getContext("2d");
 }
 
 Component.subclass(Video);
@@ -97,6 +123,20 @@ Video.prototype.initBus = function(cmp, bus, cpu, dbg)
     this.bus = bus;
     this.cpu = cpu;
     this.dbg = dbg;
+
+    /*
+     * Compute the size of the frame buffer and allocate.
+     */
+    this.sizeBuffer = ((this.cxBuffer * this.nBitsPerPixel) >> 3) * this.cyBuffer;
+    if (this.bus.addMemory(this.addrBuffer, this.sizeBuffer, Memory.TYPE.VIDEO)) {
+        /*
+         * Compute the number of cells and initialize the cell cache.
+         */
+        this.nCellCache = this.sizeBuffer >> 1;
+        this.nPixelsPerCell = (16 / this.nBitsPerPixel)|0;
+        this.initCache();
+    }
+    this.setReady();
 };
 
 /**
@@ -110,6 +150,62 @@ Video.prototype.getRefreshRate = function()
     return Math.max(this.refreshRate, this.interruptRate);
 };
 
+/**
+ * initCache()
+ *
+ * Initializes the contents of our internal cell cache.
+ *
+ * @this {Video}
+ */
+Video.prototype.initCache = function()
+{
+    this.fCellCacheValid = false;
+    if (this.aCellCache === undefined || this.aCellCache.length != this.nCellCache) {
+        this.aCellCache = new Array(this.nCellCache);
+    }
+};
+
+/**
+ * initColors()
+ *
+ * @this {Video}
+ */
+Video.prototype.initColors = function()
+{
+    this.aRGB = [
+        [0x00, 0x00, 0x00, 0xff],       // black
+        [0xff, 0xff, 0xff, 0xff]        // white
+    ];
+};
+
+/**
+ * getColors()
+ *
+ * @this {Video}
+ */
+Video.prototype.getColors = function()
+{
+    return this.aRGB;
+};
+
+/**
+ * setPixel(imageData, x, y, rgb)
+ *
+ * @this {Video}
+ * @param {Object} imageData
+ * @param {number} x
+ * @param {number} y
+ * @param {Array.<number>} rgb is a 4-element array containing the red, green, blue and alpha values
+ */
+Video.prototype.setPixel = function(imageData, x, y, rgb)
+{
+    var index = (x + y * imageData.width) * rgb.length;
+    imageData.data[index]   = rgb[0];
+    imageData.data[index+1] = rgb[1];
+    imageData.data[index+2] = rgb[2];
+    imageData.data[index+3] = rgb[3];
+};
+
 /**
  * updateScreen(n)
  *
@@ -126,18 +222,100 @@ Video.prototype.getRefreshRate = function()
  */
 Video.prototype.updateScreen = function(n)
 {
-    if (!(n & 1)) {
+    if (n >= 0) {
+        if (!(n & 1)) {
+            /*
+             * On even updates, call cpu.requestINTR(1), and also update our copy of the screen.
+             */
+            this.cpu.requestINTR(1);
+        } else {
+            /*
+             * On odd updates, call cpu.requestINTR(2), but do NOT update our copy of the screen, because
+             * the machine has presumably only updated the top half of the frame buffer at this point; it will
+             * update the bottom half of the frame buffer after acknowledging this interrupt.
+             */
+            this.cpu.requestINTR(2);
+            return;
+        }
+
         /*
-         * On even updates, call cpu.requestINTR(1), and also update our copy of the screen.
+         * Since this is not a forced update, if our cell cache is valid AND the buffer is clean, then do nothing.
          */
-        this.cpu.requestINTR(1);
-    } else {
+        if (this.fCellCacheValid && this.bus.cleanMemory(this.addrBuffer, this.sizeBuffer)) {
+            return;
+        }
+    }
+
+    /*
+     * If we're still here, then either this is a forced update, or our cell cache hasn't been filled yet, or
+     * the frame buffer is dirty.  Time to actually update the screen.
+     */
+
+    var addr = this.addrBuffer;
+    var addrLimit = addr + this.sizeBuffer;
+
+    var iCell = 0;
+    var wPixelMask = 0x10000;
+    var nPixelShift = 1;
+    var aPixelColors = this.getColors();
+
+    var x = 0, y = 0;
+    var xDirty = this.cxBuffer, xMaxDirty = 0, yDirty = this.cyBuffer, yMaxDirty = 0;
+
+    while (addr < addrLimit) {
+        var data = this.bus.getShortDirect(addr);
+        this.assert(iCell < this.aCellCache.length);
+        if (this.fCellCacheValid && data === this.aCellCache[iCell]) {
+            x += this.nPixelsPerCell;
+        } else {
+            this.aCellCache[iCell] = data;
+            var wPixels = (data >> 8) | ((data & 0xff) << 8);
+            var wMask = wPixelMask, nShift = 16;
+            if (x < xDirty) xDirty = x;
+            for (var iPixel = 0; iPixel < this.nPixelsPerCell; iPixel++) {
+                var bPixel = (wPixels & (wMask >>= nPixelShift)) >> (nShift -= nPixelShift);
+                this.setPixel(this.imageBuffer, x++, y, aPixelColors[bPixel]);
+            }
+            if (x > xMaxDirty) xMaxDirty = x;
+            if (y < yDirty) yDirty = y;
+            if (y >= yMaxDirty) yMaxDirty = y + 1;
+        }
+        addr += 2;
+        iCell++;
+        if (x >= this.cxBuffer) {
+            x = 0;
+            y++;
+            if (y > this.cyBuffer) break;
+        }
+    }
+
+    this.fCellCacheValid = true;
+
+    /*
+     * Instead of blasting the ENTIRE imageBuffer into contextBuffer, and then blasting the ENTIRE
+     * canvasBuffer onto contextScreen, even for the smallest change, let's try to be a bit smarter about
+     * the update (well, to the extent that the canvas APIs permit).
+     */
+    if (xDirty < this.cxBuffer) {
+        var cxDirty = xMaxDirty - xDirty;
+        var cyDirty = yMaxDirty - yDirty;
+        // this.contextBuffer.putImageData(this.imageBuffer, 0, 0);
+        this.contextBuffer.putImageData(this.imageBuffer, 0, 0, xDirty, yDirty, cxDirty, cyDirty);
         /*
-         * On odd updates, call cpu.requestINTR(2), but do NOT update our copy of the screen, because
-         * the machine has presumably only updated the top half of the frame buffer at this point; it will
-         * update the bottom half of the frame buffer after acknowledging this interrupt.
+         * While ideally I would draw only the dirty portion of canvasBuffer, there usually isn't a 1-1 pixel mapping
+         * between canvasBuffer and contextScreen.  In fact, the WHOLE POINT of the canvasBuffer is to leverage
+         * drawImage()'s scaling ability; for example, a CGA graphics mode might be 640x200, whereas the canvas representing
+         * the screen might be 960x400.  In those situations, if we draw interior rectangles, we often end up with subpixel
+         * artifacts along the edges of those rectangles.  So it appears I must continue to redraw the entire canvasBuffer
+         * on every change.
+         *
+        var xScreen = (((xDirty * this.cxScreen) / this.cxBuffer) | 0);
+        var yScreen = (((yDirty * this.cyScreen) / this.cyBuffer) | 0);
+        var cxScreen = (((cxDirty * this.cxScreen) / this.cxBuffer) | 0);
+        var cyScreen = (((cyDirty * this.cyScreen) / this.cyBuffer) | 0);
+        this.contextScreen.drawImage(this.canvasBuffer, xDirty, yDirty, cxDirty, cyDirty, xScreen, yScreen, cxScreen, cyScreen);
          */
-        this.cpu.requestINTR(2);
+        this.contextScreen.drawImage(this.canvasBuffer, 0, 0, this.cxBuffer, this.cyBuffer, 0, 0, this.cxScreen, this.cyScreen);
     }
 };
 
diff --git a/versions/pc8080/1.22.0/pc8080-dbg.js b/versions/pc8080/1.22.0/pc8080-dbg.js
index 822567e77..6eb276555 100644
--- a/versions/pc8080/1.22.0/pc8080-dbg.js
+++ b/versions/pc8080/1.22.0/pc8080-dbg.js
@@ -1,202 +1,206 @@
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