diff --git a/devices/pc8080/machine/README.md b/devices/pc8080/machine/README.md
index 1ad417684..570bf11dc 100644
--- a/devices/pc8080/machine/README.md
+++ b/devices/pc8080/machine/README.md
@@ -10,5 +10,7 @@ PC8080 Machine Configurations
 The following 8080-based machines are currently available:
 
 * [8080 Exerciser](exerciser/)
-* [Space Invaders (1978)](invaders/)
-* [DEC VT100 Terminal](vt100/)
+* [Space Invaders (1978)](invaders/) (with [Debugger](invaders/debugger/))
+* [DEC VT100 Terminal](vt100/) (with [Debugger](vt100/debugger/))
+
+And check out the [Dual VT100 Terminals](vt100/dual/) for a demo of two PCjs machines communicating over a *virtual* serial connection. 
diff --git a/devices/pc8080/machine/vt100/README.md b/devices/pc8080/machine/vt100/README.md
index 64e69f098..082be948c 100644
--- a/devices/pc8080/machine/vt100/README.md
+++ b/devices/pc8080/machine/vt100/README.md
@@ -3,9 +3,8 @@ layout: page
 title: DEC VT100 Terminal
 permalink: /devices/pc8080/machine/vt100/
 machines:
-  - type: pc8080
-    id: vt100
-    debugger: true
+  - id: vt100
+    type: pc8080
 ---
 
 DEC VT100 Terminal
diff --git a/devices/pc8080/machine/vt100/debugger/README.md b/devices/pc8080/machine/vt100/debugger/README.md
index 6c1844423..ec8efda2f 100644
--- a/devices/pc8080/machine/vt100/debugger/README.md
+++ b/devices/pc8080/machine/vt100/debugger/README.md
@@ -3,8 +3,8 @@ layout: page
 title: DEC VT100 Terminal with Debugger
 permalink: /devices/pc8080/machine/vt100/debugger/
 machines:
-  - type: pc8080
-    id: vt100
+  - id: vt100
+    type: pc8080
     debugger: true
 ---
 
@@ -51,6 +51,36 @@ keys.  The following keys have special meaning inside SET-UP Mode.
 - SHIFT-S: Save SET-UP Features
 - SHIFT-R: Restore SET-UP Features
 
+### SET-UP B Options
+
+#### Block 1
+
+- 1---: Smooth scroll
+- -1--: Auto-Repeat
+- --1-: Light Screen Background
+- ---1: Block Cursor
+
+#### Block 2
+
+- 1---: Margin Bell
+- -1--: Key-click
+- --1-: ANSI
+- ---1: Auto-XON/XOFF
+
+#### Block 3
+
+- 1---: UK Pound Symbol
+- -1--: Wrap-Around
+- --1-: New Line
+- ---1: Interlace
+
+#### Block 4
+
+- 1---: Even Parity
+- -1--: Parity Enable
+- --1-: 8 Data Bits
+- ---1: 50Hz Power
+
 VT100 Memory Usage
 ------------------
 
diff --git a/devices/pc8080/machine/vt100/debugger/machine.xml b/devices/pc8080/machine/vt100/debugger/machine.xml
index a4349b299..3a2f8364f 100644
--- a/devices/pc8080/machine/vt100/debugger/machine.xml
+++ b/devices/pc8080/machine/vt100/debugger/machine.xml
@@ -27,7 +27,7 @@
 	<keyboard id="keyboard" model="VT100">
 		<control type="button" binding="setup" padleft="8px">SET-UP</control>
 	</keyboard>
-	<serial id="serial0" adapter="0">
+	<serial id="serialPort" adapter="0" binding="print">
 		<control type="button" binding="test" value="HELLO WORLD!\r\n" padleft="8px">TEST RECEIVER</control>
 	</serial>
 	<panel ref="/devices/pc8080/panel/wide.xml"/>
diff --git a/devices/pc8080/machine/vt100/dual/README.md b/devices/pc8080/machine/vt100/dual/README.md
new file mode 100644
index 000000000..1e17eafc6
--- /dev/null
+++ b/devices/pc8080/machine/vt100/dual/README.md
@@ -0,0 +1,27 @@
+---
+layout: page
+title: Dual VT100 Terminals
+permalink: /devices/pc8080/machine/vt100/dual/
+machines:
+  - id: vt100a
+    type: pc8080
+    config: /devices/pc8080/machine/vt100/machine.xml
+    connection: serialPort=vt100b.serialPort
+  - id: vt100b
+    type: pc8080
+    config: /devices/pc8080/machine/vt100/machine.xml
+    connection: serialPort=vt100a.serialPort
+---
+
+Dual VT100 Terminals
+--------------------
+
+This is a test of two [VT100 Terminals](../) whose serial ports are *virtually* connected, so anything you type in the first
+terminal should appear on the screen of the second, and vice versa.  Click or tap on the screen of the desired terminal before
+you begin typing.
+
+If either terminal becomes LOCKED, press the SET-UP key (mapped to your F9 function key) twice to unlock it. 
+
+{% include machine.html id="vt100a" %}
+
+{% include machine.html id="vt100b" %}
diff --git a/devices/pc8080/machine/vt100/machine.xml b/devices/pc8080/machine/vt100/machine.xml
index 378bca98e..c9df17c00 100644
--- a/devices/pc8080/machine/vt100/machine.xml
+++ b/devices/pc8080/machine/vt100/machine.xml
@@ -27,7 +27,7 @@
 	<keyboard id="keyboard" model="VT100">
 		<control type="button" binding="setup" padleft="8px" padbottom="8px">SET-UP</control>
 	</keyboard>
-	<serial id="serial0" adapter="0">
+	<serial id="serialPort" adapter="0">
 		<control type="button" binding="test" value="HELLO WORLD!\r\n" padleft="8px" padbottom="8px">TEST RECEIVER</control>
 	</serial>
 </machine>
diff --git a/modules/pc8080/lib/chipset.js b/modules/pc8080/lib/chipset.js
index 67cdff3ab..f1c702245 100644
--- a/modules/pc8080/lib/chipset.js
+++ b/modules/pc8080/lib/chipset.js
@@ -220,16 +220,16 @@ ChipSet.SI1978 = {
  */
 ChipSet.VT100 = {
     MODEL:          100.0,
-    FLAGS_BUFFER: {
+    FLAGS: {
         PORT:       0x42,               // read-only
-        XMIT:       0x01,               // PUSART transmit buffer empty if SET
+        UART_XMIT:  0x01,               // PUSART transmit buffer empty if SET
         NO_AVO:     0x02,               // AVO present if CLEAR
         NO_GFX:     0x04,               // VT125 graphics board present if CLEAR
         OPTION:     0x08,               // OPTION present if SET
         NO_EVEN:    0x10,               // EVEN FIELD active if CLEAR
         NVR_DATA:   0x20,               // NVR DATA if SET
         NVR_CLK:    0x40,               // NVR CLOCK if SET
-        KBD_XMIT:   0x80                // KBD XMIT BUFFER empty if SET
+        KBD_XMIT:   0x80                // KBD transmit buffer empty if SET
     },
     BRIGHTNESS: {
         PORT:       0x42,               // write-only
@@ -424,6 +424,7 @@ ChipSet.prototype.initBus = function(cmp, bus, cpu, dbg)
     this.dbg = dbg;
     this.cmp = cmp;
     this.kbd = /** @type {Keyboard} */ (cmp.getMachineComponent("Keyboard"));
+    this.serial = /** @type {SerialPort} */ (cmp.getMachineComponent("SerialPort"));
     this.video = /** @type {Video} */ (cmp.getMachineComponent("Video"));
     bus.addPortInputTable(this, this.config.portsInput);
     bus.addPortOutputTable(this, this.config.portsOutput);
@@ -474,7 +475,7 @@ ChipSet.SI1978.INIT = [
 ChipSet.VT100.INIT = [
     [
         ChipSet.VT100.BRIGHTNESS.INIT,
-        ChipSet.VT100.FLAGS_BUFFER.NO_AVO | ChipSet.VT100.FLAGS_BUFFER.NO_GFX
+        ChipSet.VT100.FLAGS.NO_AVO | ChipSet.VT100.FLAGS.NO_GFX
     ],
     [
         ChipSet.VT100.DC011.INITCOLS,
@@ -531,7 +532,7 @@ 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.bBrightness, this.bFlagsBuffer]);
+        state.set(0, [this.bBrightness, this.bFlags]);
         state.set(1, [this.bDC011Cols, this.bDC011Rate]);
         state.set(2, [this.bDC012Scroll, this.bDC012Blink, this.bDC012Reverse, this.bDC012Attr]);
         state.set(3, [this.dNVRAddr, this.wNVRData, this.bNVRLatch, this.bNVROut, this.aNVRWords]);
@@ -555,31 +556,31 @@ ChipSet.prototype.restore = function(data)
     if (data && (a = data[0]) && a.length) {
         switch(this.config.MODEL) {
         case ChipSet.SI1978.MODEL:
-            this.bStatus0 = a[0];
-            this.bStatus1 = a[1];
-            this.bStatus2 = a[2];
-            this.wShiftData = a[3];
-            this.bShiftCount = a[4];
-            this.bSound1 = a[5];
-            this.bSound2 = a[6];
+            this.bStatus0      = a[0];
+            this.bStatus1      = a[1];
+            this.bStatus2      = a[2];
+            this.wShiftData    = a[3];
+            this.bShiftCount   = a[4];
+            this.bSound1       = a[5];
+            this.bSound2       = a[6];
             return true;
         case ChipSet.VT100.MODEL:
-            this.bBrightness = a[0];
-            this.bFlagsBuffer = a[1];
+            this.bBrightness   = a[0];
+            this.bFlags        = a[1];
             a = data[1];
-            this.bDC011Cols = a[0];
-            this.bDC011Rate = a[1];
+            this.bDC011Cols    = a[0];
+            this.bDC011Rate    = a[1];
             a = data[2];
-            this.bDC012Scroll = a[0];
-            this.bDC012Blink = a[1];
+            this.bDC012Scroll  = a[0];
+            this.bDC012Blink   = a[1];
             this.bDC012Reverse = a[2];
-            this.bDC012Attr = a[3];
+            this.bDC012Attr    = a[3];
             a = data[3];
-            this.dNVRAddr = a[0];               // 20-bit address
-            this.wNVRData = a[1];               // 14-bit word
-            this.bNVRLatch = a[2];              // 1 byte
-            this.bNVROut = a[3];                // 1 bit
-            this.aNVRWords = a[4];              // 100 14-bit words
+            this.dNVRAddr      = a[0];          // 20-bit address
+            this.wNVRData      = a[1];          // 14-bit word
+            this.bNVRLatch     = a[2];          // 1 byte
+            this.bNVROut       = a[3];          // 1 bit
+            this.aNVRWords     = a[4];          // 100 14-bit words
             return true;
         }
     }
@@ -883,36 +884,40 @@ ChipSet.prototype.doNVRCommand = function()
 };
 
 /**
- * inVT100FlagsBuffer(port, addrFrom)
+ * inVT100Flags(port, addrFrom)
  *
  * @this {ChipSet}
  * @param {number} port (0x42)
  * @param {number} [addrFrom] (not defined if the Debugger is trying to read the specified port)
  * @return {number} simulated port value
  */
-ChipSet.prototype.inVT100FlagsBuffer = function(port, addrFrom)
+ChipSet.prototype.inVT100Flags = function(port, addrFrom)
 {
     /*
      * 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;
-    b &= ~ChipSet.VT100.FLAGS_BUFFER.NVR_CLK;
+    var b = this.bFlags;
+    b &= ~ChipSet.VT100.FLAGS.NVR_CLK;
     if (this.getVT100LBA(7)) {
-        b |= ChipSet.VT100.FLAGS_BUFFER.NVR_CLK;
-        if (b != this.bFlagsBuffer) {
+        b |= ChipSet.VT100.FLAGS.NVR_CLK;
+        if (b != this.bFlags) {
             this.doNVRCommand();
         }
     }
-    b &= ~ChipSet.VT100.FLAGS_BUFFER.NVR_DATA;
+    b &= ~ChipSet.VT100.FLAGS.NVR_DATA;
     if (this.bNVROut) {
-        b |= ChipSet.VT100.FLAGS_BUFFER.NVR_DATA;
+        b |= ChipSet.VT100.FLAGS.NVR_DATA;
     }
-    b &= ~ChipSet.VT100.FLAGS_BUFFER.KBD_XMIT;
-    if (this.kbd && !this.kbd.checkBusy()) {
-        b |= ChipSet.VT100.FLAGS_BUFFER.KBD_XMIT;
+    b &= ~ChipSet.VT100.FLAGS.KBD_XMIT;
+    if (this.kbd && this.kbd.isTransmitterReady()) {
+        b |= ChipSet.VT100.FLAGS.KBD_XMIT;
     }
-    this.bFlagsBuffer = b;
-    this.printMessageIO(port, null, addrFrom, "FLAGS.BUFFER", b);
+    b &= ~ChipSet.VT100.FLAGS.UART_XMIT;
+    if (this.serial && this.serial.isTransmitterReady()) {
+        b |= ChipSet.VT100.FLAGS.UART_XMIT;
+    }
+    this.bFlags = b;
+    this.printMessageIO(port, null, addrFrom, "FLAGS", b);
     return b;
 };
 
@@ -967,6 +972,7 @@ ChipSet.prototype.outVT100DC012 = function(port, b, addrFrom)
         break;
     case 0x1:
         this.bDC012Scroll = (this.bDC012Scroll & ~0xC) | (bOpt << 2);
+        if (this.video) this.video.updateScrollOffset(this.bDC012Scroll);
         break;
     case 0x2:
         switch(bOpt) {
@@ -1013,7 +1019,7 @@ ChipSet.prototype.outVT100DC011 = function(port, b, addrFrom)
             this.bDC011Cols = b;
             if (this.video) {
                 var nCols = (this.bDC011Cols == ChipSet.VT100.DC011.COLS132? 132 : 80);
-                var nRows = (nCols > 80 && (this.bFlagsBuffer & ChipSet.VT100.FLAGS_BUFFER.NO_AVO)? 14 : 24);
+                var nRows = (nCols > 80 && (this.bFlags & ChipSet.VT100.FLAGS.NO_AVO)? 14 : 24);
                 this.video.updateDimensions(nCols, nRows);
             }
         }
@@ -1039,7 +1045,7 @@ ChipSet.SI1978.portsOutput = {
 };
 
 ChipSet.VT100.portsInput = {
-    0x42: ChipSet.prototype.inVT100FlagsBuffer
+    0x42: ChipSet.prototype.inVT100Flags
 };
 
 ChipSet.VT100.portsOutput = {
diff --git a/modules/pc8080/lib/keyboard.js b/modules/pc8080/lib/keyboard.js
index 3daed04d3..4cb30932e 100644
--- a/modules/pc8080/lib/keyboard.js
+++ b/modules/pc8080/lib/keyboard.js
@@ -870,17 +870,17 @@ Keyboard.prototype.checkSoftKeysToRelease = function()
 };
 
 /**
- * checkBusy()
+ * isTransmitterReady()
  *
- * Called whenever a ChipSet circuit needs the keyboard's UART status.
- * Currently, we have no busy conditions (our virtual keyboard is infinitely fast).
+ * Called whenever a ChipSet circuit needs the Keyboard UART's transmitter status.
+ * Currently, we have no busy conditions (our virtual keyboard transmitter is infinitely fast).
  *
  * @this {Keyboard}
- * @return {boolean}
+ * @return {boolean} (true if ready, false if not)
  */
-Keyboard.prototype.checkBusy = function()
+Keyboard.prototype.isTransmitterReady = function()
 {
-    return false;
+    return true;
 };
 
 /**
diff --git a/modules/pc8080/lib/serialport.js b/modules/pc8080/lib/serialport.js
index 36a781cea..4e8e6d720 100644
--- a/modules/pc8080/lib/serialport.js
+++ b/modules/pc8080/lib/serialport.js
@@ -36,7 +36,6 @@ if (NODE) {
     var web         = require("../../shared/lib/weblib");
     var Component   = require("../../shared/lib/component");
     var Messages    = require("./messages");
-    var ChipSet     = require("./chipset");
     var State       = require("./state");
 }
 
@@ -86,7 +85,7 @@ function SerialPort(parmsSerial) {
     this.consoleOutput = null;
 
     /**
-     * controlIOBuffer is a DOM element, if any, bound to the port (currently used for output only; see echoByte()).
+     * controlIOBuffer is a DOM element bound to the port (currently used for output only; see transmitByte()).
      *
      * @type {Object}
      */
@@ -94,7 +93,7 @@ function SerialPort(parmsSerial) {
 
     /*
      * If controlIOBuffer is being used AND 'tabSize' is set, then we make an attempt to monitor the characters
-     * being echoed via echoByte(), maintain a logical column position, and convert any tabs into the appropriate
+     * being echoed via transmitByte(), maintain a logical column position, and convert any tabs into the appropriate
      * number of spaces.
      *
      * charBOL, if nonzero, is a character to automatically output at the beginning of every line.  This probably
@@ -115,6 +114,27 @@ function SerialPort(parmsSerial) {
          */
         Component.bindExternalControl(this, sBinding, SerialPort.sIOBuffer);
     }
+
+    /*
+     * Define a setTimeout() function that receiveData() can use when there's more data to receive.
+     */
+    this.fnCheckDataReceived = function(serial) {
+        return function() {
+            serial.receiveData();
+        }
+    }(this);
+
+    /*
+     * No connection until initBus() invokes initConnection().
+     */
+    this.connection = this.sendByte = null;
+
+    /*
+     * Export all functions required by initConnection(); currently, this is the bare minimum, with no flow control.
+     */
+    this['exports'] = {
+        'receiveByte': this.receiveByte
+    };
 }
 
 /*
@@ -122,7 +142,7 @@ function SerialPort(parmsSerial) {
  * property {number} iAdapter
  * property {number} portBase
  * property {number} nIRQ
- * property {Object} controlIOBuffer is a DOM element, if any, bound to the port (for rudimentary output; see echoByte())
+ * property {Object} controlIOBuffer is a DOM element bound to the port (for rudimentary output; see transmitByte())
  *
  * NOTE: This class declaration started as a way of informing the code inspector of the controlIOBuffer property,
  * which remained undefined until a setBinding() call set it later, but I've since decided that explicitly
@@ -146,7 +166,7 @@ SerialPort.UART8251 = {
         PARITY_ENABLE:  0x10,
         EVEN_PARITY:    0x20,
         STOP_BITS:      0xC0,       // 00=invalid, 01=1, 10=1.5, 11=2
-        INIT:           0x8E        // 16x baudrate, 8 data bits, no parity, 1.5 stop bits
+        INIT:           0x8E        // 16x baud rate, 8 data bits, no parity, 1.5 stop bits
     },
     /*
      * Format of COMMAND byte written to CONTROL port 0x1
@@ -177,9 +197,10 @@ SerialPort.UART8251 = {
         INIT:           0x85        // XMIT_READY | XMIT_EMPTY | DSR
     },
     /*
-     * Format of BAUDRATE byte written to port 0x2
+     * Format of BAUDRATES byte written to port 0x2
      *
-     * Each nibble is an index (0x0-0xF) into a set internal CPU clock divisors that yield the following baud rates:
+     * Each nibble is an index (0x0-0xF) into a set of internal CPU clock divisors that yield the
+     * following baud rates:
      *
      *      Index   Divisor     Baud Rate
      *      -----   -------     ---------
@@ -199,15 +220,15 @@ SerialPort.UART8251 = {
      *      0xD      36         4800
      *      0xE      18         9600    (default)
      *      0xF      9          19200
-     *
-     * TODO: I'm not really sure at this point which nibble is for the XMIT rate and which is for the RECV
-     * rate; I just made a random guess.
      */
-    BAUDRATE: {
-        XMIT_RATE:      0x0F,
-        RECV_RATE:      0xF0,
+    BAUDRATES: {
+        RECV_RATE:      0x0F,
+        XMIT_RATE:      0xF0,
         INIT:           0xEE        // default to 9600 (0xE) for both XMIT and RECV
-    }
+    },
+    BAUDTABLE: [
+        50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2000, 2400, 3600, 4800, 9600, 19200
+    ]
 };
 
 SerialPort.UART8251.INIT = [
@@ -217,7 +238,7 @@ SerialPort.UART8251.INIT = [
     SerialPort.UART8251.STATUS.INIT,
     SerialPort.UART8251.MODE.INIT,
     SerialPort.UART8251.COMMAND.INIT,
-    SerialPort.UART8251.BAUDRATE.INIT
+    SerialPort.UART8251.BAUDRATES.INIT
 ];
 
 /*
@@ -272,7 +293,7 @@ SerialPort.prototype.setBinding = function(sHTMLType, sBinding, control, sValue)
             if (keyCode === 0x08 || event.ctrlKey && keyCode >= 0x41 && keyCode <= 0x5A) {
                 if (event.preventDefault) event.preventDefault();
                 if (keyCode > 0x40) keyCode -= 0x40;
-                serial.sendByteIn(keyCode);
+                serial.receiveByte(keyCode);
             }
             return true;
         };
@@ -284,7 +305,7 @@ SerialPort.prototype.setBinding = function(sHTMLType, sBinding, control, sValue)
              */
             event = event || window.event;
             var keyCode = event.which || event.keyCode;
-            // serial.sendRBR([keyCode]);
+            serial.receiveByte(keyCode);
             /*
              * Since we're going to remove the "readonly" attribute from the <textarea> control
              * (so that the soft keyboard activates on iOS), instead of calling preventDefault() for
@@ -317,8 +338,8 @@ SerialPort.prototype.setBinding = function(sHTMLType, sBinding, control, sValue)
              */
             sValue = sValue.replace(/\\n/g, "\n").replace(/\\r/g, "\r");
             control.onclick = function onClickTest(event) {
-                serial.sDataIn = sValue;
-                serial.sendDataIn();
+                serial.sDataReceived = sValue;
+                serial.receiveData();
                 /*
                  * Give focus back to the machine (since clicking the button takes focus away).
                  */
@@ -350,9 +371,47 @@ SerialPort.prototype.initBus = function(cmp, bus, cpu, dbg)
     this.chipset = /** @type {ChipSet} */ (cmp.getMachineComponent("ChipSet"));
     bus.addPortInputTable(this, SerialPort.aPortInput, this.portBase);
     bus.addPortOutputTable(this, SerialPort.aPortOutput, this.portBase);
+    this.initConnection();
     this.setReady();
 };
 
+/**
+ * initConnection()
+ *
+ * If a machine 'connection' parameter exists of the form "<sourcePort>=<targetMachine>.<targetPort>",
+ * and "<sourcePort>" matches our idComponent, then look for a component with id "<targetMachine>.<targetPort>".
+ *
+ * If the target component is found, then verify that it has exported functions with the following names:
+ *
+ *      receiveByte(b): called by us when we have a byte to transmit; aliased internally to sendByte(b)
+ *
+ * For now, we're not going to worry about communication in the other direction, because when the target component
+ * performs its own initConnection(), it will find our receiveByte(b) function, at which point communication in both
+ * directions should be established.
+ *
+ * @this {SerialPort}
+ */
+SerialPort.prototype.initConnection = function()
+{
+    var sConnection = this.cmp.getMachineParm("connection");
+    if (sConnection) {
+        var asParts = sConnection.split('=');
+        if (asParts.length == 2) {
+            var sSourceID = str.trim(asParts[0]);
+            var sTargetID = str.trim(asParts[1]);
+            if (sSourceID == this.idComponent) {
+                this.connection = Component.getComponentByID(sTargetID);
+                if (this.connection) {
+                    var exports = this.connection['exports'];
+                    if (exports) {
+                        this.sendByte = exports['receiveByte'];
+                    }
+                }
+            }
+        }
+    }
+};
+
 /**
  * powerUp(data, fRepower)
  *
@@ -444,7 +503,7 @@ SerialPort.prototype.initState = function(data)
     this.bStatus    = data[i++];
     this.bMode      = data[i++];
     this.bCommand   = data[i++];
-    this.bBaudRate  = data[i];
+    this.bBaudRates = data[i];
     return true;
 };
 
@@ -464,18 +523,37 @@ SerialPort.prototype.saveRegisters = function()
     data[i++] = this.bStatus;
     data[i++] = this.bMode;
     data[i++] = this.bCommand;
-    data[i]   = this.bBaudRate;
+    data[i]   = this.bBaudRates;
     return data;
 };
 
 /**
- * sendByteIn(b)
+ * getBaudTimeout(maskRate)
+ *
+ * @this {SerialPort}
+ * @param {number} maskRate (either SerialPort.UART8251.BAUDRATES.RECV_RATE or SerialPort.UART8251.BAUDRATES.XMIT_RATE)
+ * @return {number} (number of milliseconds per byte)
+ */
+SerialPort.prototype.getBaudTimeout = function(maskRate)
+{
+    var indexRate = (this.bBaudRates & maskRate);
+    if (!(maskRate & 0xf)) indexRate >>= 4;
+    var nBaud = SerialPort.UART8251.BAUDTABLE[indexRate];
+    var nBits = ((this.bMode & SerialPort.UART8251.MODE.DATA_BITS) >> 2) + 6;   // includes an extra +1 for start bit
+    if (this.bMode & SerialPort.UART8251.MODE.PARITY_ENABLE) nBits++;
+    nBits += ((((this.bMode & SerialPort.UART8251.MODE.STOP_BITS) >> 6) + 1) >> 1);
+    var nBytesPerSecond = Math.round(nBaud / nBits);
+    return 1000 / nBytesPerSecond;
+};
+
+/**
+ * receiveByte(b)
  *
  * @this {SerialPort}
  * @param {number} b
  * @return {boolean}
  */
-SerialPort.prototype.sendByteIn = function(b)
+SerialPort.prototype.receiveByte = function(b)
 {
     if (!(this.bStatus & SerialPort.UART8251.STATUS.RECV_FULL)) {
         this.bDataIn = b;
@@ -487,28 +565,52 @@ SerialPort.prototype.sendByteIn = function(b)
 };
 
 /**
- * sendDataIn()
+ * receiveData()
  *
  * @this {SerialPort}
  */
-SerialPort.prototype.sendDataIn = function()
+SerialPort.prototype.receiveData = function()
 {
-    if (this.sDataIn) {
-        if (this.sendByteIn(this.sDataIn.charCodeAt(0))) {
-            this.sDataIn = this.sDataIn.substr(1);
+    if (this.sDataReceived) {
+        if (this.receiveByte(this.sDataReceived.charCodeAt(0))) {
+            this.sDataReceived = this.sDataReceived.substr(1);
+        }
+        /*
+         * TODO: If data has become undeliverable for some reason (eg, the Debugger has paused execution),
+         * we should stop setting timeouts, and add one or more notification mechanisms to kickstart it again.
+         */
+        if (this.sDataReceived) {
+            /*
+             * TODO: setTimeout() is a less-than-ideal solution, because it's too slow; timeouts won't fire until
+             * the end of a CPU burst.  So instead of calculating a number of milliseconds, we should calculate a
+             * number of CPU cycles, and create a CPU notification mechanism that calls us back after that many cycles
+             * have elapsed (and which will automatically shorten the current CPU burst as needed).
+             *
+             * This will also solve the other issue noted above, because if the CPU has been halted, it won't be
+             * generating any notifications either.
+             */
+            setTimeout(this.fnCheckDataReceived, this.getBaudTimeout(SerialPort.UART8251.BAUDRATES.RECV_RATE));
         }
     }
 };
 
 /**
- * echoByte(b)
+ * transmitByte(b)
  *
  * @this {SerialPort}
  * @param {number} b
- * @return {boolean} true if echoed, false if not
+ * @return {boolean} true if transmitted, false if not
  */
-SerialPort.prototype.echoByte = function(b)
+SerialPort.prototype.transmitByte = function(b)
 {
+    var fTransmitted = false;
+
+    if (this.sendByte) {
+        if (this.sendByte.call(this.connection, b)) {
+            fTransmitted = true;
+        }
+    }
+
     if (this.controlIOBuffer) {
         if (b == 0x0D) {
             this.iLogicalCol = 0;
@@ -533,9 +635,9 @@ SerialPort.prototype.echoByte = function(b)
             this.controlIOBuffer.scrollTop = this.controlIOBuffer.scrollHeight;
             this.iLogicalCol += nChars;
         }
-        return true;
+        fTransmitted = true;
     }
-    if (this.consoleOutput != null) {
+    else if (this.consoleOutput != null) {
         if (b == 0x0A || this.consoleOutput.length >= 1024) {
             this.println(this.consoleOutput);
             this.consoleOutput = "";
@@ -543,9 +645,23 @@ SerialPort.prototype.echoByte = function(b)
         if (b != 0x0A) {
             this.consoleOutput += String.fromCharCode(b);
         }
-        return true;
+        fTransmitted = true;
     }
-    return false;
+
+    return fTransmitted;
+};
+
+/**
+ * isTransmitterReady()
+ *
+ * Called whenever a ChipSet circuit needs the SerialPort UART's transmitter status.
+ *
+ * @this {SerialPort}
+ * @return {boolean} (true if ready, false if not)
+ */
+SerialPort.prototype.isTransmitterReady = function()
+{
+    return !!(this.bStatus & SerialPort.UART8251.STATUS.XMIT_READY);
 };
 
 /**
@@ -561,7 +677,6 @@ SerialPort.prototype.inData = function(port, addrFrom)
     var b = this.bDataIn;
     this.printMessageIO(port, null, addrFrom, "DATA", b);
     this.bStatus &= ~SerialPort.UART8251.STATUS.RECV_FULL;
-    this.sendDataIn();          // if there is still queued incoming data, send another byte
     return b;
 };
 
@@ -592,6 +707,10 @@ SerialPort.prototype.outData = function(port, bOut, addrFrom)
 {
     this.printMessageIO(port, bOut, addrFrom, "DATA");
     this.bDataOut = bOut;
+    this.bStatus &= ~(SerialPort.UART8251.STATUS.XMIT_READY | SerialPort.UART8251.STATUS.XMIT_EMPTY);
+    if (this.transmitByte(bOut)) {
+        this.bStatus |= (SerialPort.UART8251.STATUS.XMIT_READY | SerialPort.UART8251.STATUS.XMIT_EMPTY);
+    }
 };
 
 /**
@@ -622,17 +741,17 @@ SerialPort.prototype.outControl = function(port, bOut, addrFrom)
 };
 
 /**
- * outBaudRate(port, bOut, addrFrom)
+ * outBaudRates(port, bOut, addrFrom)
  *
  * @this {SerialPort}
  * @param {number} port (0x2)
  * @param {number} bOut
  * @param {number} [addrFrom] (not defined whenever the Debugger tries to write the specified port)
  */
-SerialPort.prototype.outBaudRate = function(port, bOut, addrFrom)
+SerialPort.prototype.outBaudRates = function(port, bOut, addrFrom)
 {
-    this.printMessageIO(port, bOut, addrFrom, "BAUDRATE");
-    this.bBaudRate = bOut;
+    this.printMessageIO(port, bOut, addrFrom, "BAUDRATES");
+    this.bBaudRates = bOut;
 };
 
 /*
@@ -650,7 +769,7 @@ SerialPort.aPortInput = {
 SerialPort.aPortOutput = {
     0x0: SerialPort.prototype.outData,
     0x1: SerialPort.prototype.outControl,
-    0x2: SerialPort.prototype.outBaudRate
+    0x2: SerialPort.prototype.outBaudRates
 };
 
 /**
diff --git a/modules/pc8080/lib/video.js b/modules/pc8080/lib/video.js
index e9cabed5b..2d9868b72 100644
--- a/modules/pc8080/lib/video.js
+++ b/modules/pc8080/lib/video.js
@@ -154,7 +154,10 @@ function Video(parmsVideo, canvas, context, textarea, container)
      * Now that we've finished using nRowsBuffer to help define the screen size, we add one more
      * row for text modes, to account for the VT100's scroll line buffer (used for smooth scrolling).
      */
-    if (this.cyCell > 1) this.nRowsBuffer++;
+    if (this.cyCell > 1) {
+        this.nRowsBuffer++;
+        this.bScrollOffset = 0;
+    }
 
     /*
      * Support for disabling (or, less commonly, enabling) image smoothing, which all browsers
@@ -762,6 +765,23 @@ Video.prototype.updateRate = function(nRate)
     this.rateMonitor = nRate;
 };
 
+/**
+ * updateScrollOffset(bScroll)
+ *
+ * Called from the ChipSet component whenever the screen scroll offset has been dynamically altered.
+ *
+ * @this {Video}
+ * @param {number} bScroll
+ */
+Video.prototype.updateScrollOffset = function(bScroll)
+{
+    this.printMessage("updateScrollOffset(" + bScroll + ")");
+    if (this.bScrollOffset !== bScroll) {
+        this.bScrollOffset = bScroll;
+        this.updateScreen(-1);
+    }
+};
+
 /**
  * doFullScreen()
  *
@@ -1091,6 +1111,8 @@ Video.prototype.updateVT100 = function(fForced)
         nRows++;
     }
 
+    this.fCellCacheValid = true;
+
     this.assert(font < 0 || iCell === this.nCellCache);
 
     if (MAXDEBUG && !fForced) {
@@ -1103,14 +1125,23 @@ Video.prototype.updateVT100 = function(fForced)
         this.printMessage("updateVT100(): update #" + this.nUpdateNumber + " at " +this.nUpdateSeconds + " corner=" + str.toHexByte(this.aCellCache[1]) + " cycles=" + this.nCyclesPrev + " delta=" + this.nCyclesDelta);
     }
 
-    this.fCellCacheValid = true;
-
-    if (cUpdated && this.contextBuffer) {
+    if ((cUpdated || fForced) && this.contextBuffer) {
         /*
-         * NOTE: We must subtract cyCell from cyBuffer to avoid displaying the extra "scroll line" that we normally
-         * buffer to support smooth-scrolling.
+         * We must subtract cyCell from cyBuffer to avoid displaying the extra "scroll line" that we normally
+         * buffer, in support of smooth scrolling.  Speaking of which, we must also add bScrollOffset to ySrc
+         * (well, ySrc is always relative to zero, so no add is actually required).
          */
-        this.contextScreen.drawImage(this.canvasBuffer, 0, 0, this.cxBuffer, this.cyBuffer - this.cyCell, this.xScreenOffset, this.yScreenOffset, this.cxScreenOffset, this.cyScreenOffset);
+        this.contextScreen.drawImage(
+            this.canvasBuffer,
+            0,                                  // xSrc
+            this.bScrollOffset,                 // ySrc
+            this.cxBuffer,                      // cxSrc
+            this.cyBuffer - this.cyCell,        // cySrc
+            this.xScreenOffset,                 // xDst
+            this.yScreenOffset,                 // yDst
+            this.cxScreenOffset,                // cxDst
+            this.cyScreenOffset                 // cyDst
+        );
     }
 };
 
diff --git a/versions/pc8080/1.23.3/pc8080-dbg.js b/versions/pc8080/1.23.3/pc8080-dbg.js
index 6f67e0441..1eae66cb9 100644
--- a/versions/pc8080/1.23.3/pc8080-dbg.js
+++ b/versions/pc8080/1.23.3/pc8080-dbg.js
@@ -1,244 +1,247 @@
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-function n(a,b){var c="";void 0===b?b=8:8<b&&(b=8);if(null==a||isNaN(a))for(;0<b--;)c="?"+c;else for(;0<b--;){var d=a&15,d=d+(0<=d&&9>=d?48:55),c=String.fromCharCode(d)+c;a>>=4}return c}function t(a){return"0x"+n(a,4)}function ca(a,b){var c=a,d=a.lastIndexOf("/");0<=d&&(c=a.substr(d+1));d=c.indexOf("&");0<d&&(c=c.substr(0,d));b&&(d=c.lastIndexOf("."),0<d&&(c=c.substring(0,d)));return c}function da(a){var b="",c=a.lastIndexOf(".");0<=c&&(b=a.substr(c+1).toLowerCase());return b}
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+J(this));this.b-=11},function(){this.j=bd(this,M(this));this.b-=7},function(){Q(this,this.R);G(this,32);this.b-=11},function(){Wc(this)&&(G(this,P(this)),this.b-=6);this.b-=5},function(){G(this,J(this));this.b-=5},function(){var a=N(this);Wc(this)&&G(this,a);this.b-=10},function(){var a=J(this);Tc(this,Rc(this));Sc(this,a);this.b-=5},function(){var a=N(this);Wc(this)&&(Q(this,this.R),G(this,a),this.b-=6);this.b-=11},Gd,function(){this.j=zd(this,M(this));this.b-=7},function(){Q(this,this.R);G(this,
+40);this.b-=11},function(){Zc(this)||(G(this,P(this)),this.b-=6);this.b-=5},function(){var a=P(this);Mc(this,a&255|this.va&-256);this.j=a>>8;this.b-=10},function(){var a=N(this);Zc(this)||G(this,a);this.b-=10},function(){this.va&=-513;this.b-=4},function(){var a=N(this);Zc(this)||(Q(this,this.R),G(this,a),this.b-=6);this.b-=11},function(){Q(this,Oc(this)&255|this.j<<8);this.b-=11},function(){this.j=ed(this,M(this));this.b-=7},function(){Q(this,this.R);G(this,48);this.b-=11},function(){Zc(this)&&(G(this,
+P(this)),this.b-=6);this.b-=5},function(){this.la=J(this)&65535;this.b-=5},function(){var a=N(this);Zc(this)&&G(this,a);this.b-=10},function(){this.va|=512;this.b-=4},function(){var a=N(this);Zc(this)&&(Q(this,this.R),G(this,a),this.b-=6);this.b-=11},Gd,function(){L(this,M(this));this.b-=7},function(){Q(this,this.R);G(this,56);this.b-=11}];
+function T(a){w.call(this,"ChipSet",a,T,32768);var b=a.model;b&&!Hd[b]&&La("Unrecognized ChipSet model: "+b);this.B=Hd[b]||{};a.sound&&(this.ha=null,window&&(this.ha=window.AudioContext||window.webkitAudioContext),this.ha&&new this.ha);E(this)}Xa(T);
+var U={Aa:1978.1,rd:{Ba:0,de:1,he:16,oe:32,xe:64,we:128,wb:14},Wa:{Ba:1,Sc:1,ld:2,gd:4,hd:16,jd:32,kd:64,wb:8},sd:{Ba:2,ce:3,Fe:4,ee:8,se:16,te:32,ue:64,fe:128,wb:0},Be:{Ba:3},ze:{Ba:2,pe:7},De:{Ba:3,Ge:1,Ce:2,ve:4,me:8,ge:16,$d:32},Ae:{Ba:4},Ee:{Ba:5,ie:1,je:2,ke:4,le:8,He:16}},V={Aa:100,Ja:{Ba:66,qc:1,mc:2,fd:4,re:8,qe:16,oc:32,nc:64,jc:128},Rc:{Ba:66,INIT:0},Ua:{Ba:194,be:0,ic:16,md:32,pc:48,Wc:0,Xc:32},Kb:{Ba:162,ye:0,Zc:0,Vc:0,Yc:0,Uc:0},Ka:{ne:{Ba:98},Ta:{Pc:0,Oc:1,od:2,td:4,Tc:5,nd:6,pd:7},
+Lb:16383}},Hd={SI1978:U,VT100:V};T.prototype.ma=function(){return!1};T.prototype.Qa=function(a,b,c,d){this.w=b;this.b=c;this.H=d;this.A=a;this.J=tb(a,"Keyboard");this.Na=tb(a,"SerialPort");this.video=tb(a,"Video");Eb(b,this,this.B.Rb);Ib(b,this,this.B.Sb)};T.prototype.Ea=function(a,b){if(!b)if(!a)this.reset();else if(!this.restore(a))return!1;return!0};T.prototype.Ha=function(a){return a?this.save():!0};U.INIT=[[U.rd.wb,U.Wa.wb,U.sd.wb,0,0,0,0]];
+V.INIT=[[V.Rc.INIT,V.Ja.mc|V.Ja.fd],[V.Ua.Wc,V.Ua.Xc],[V.Kb.Zc,V.Kb.Vc,V.Kb.Yc,V.Kb.Uc],[0,0,0,0,[11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11904,11776,11784,11918,11776,11856,11824,11840,11808,11776,12E3,12E3,11857,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]]];
+m=T.prototype;m.reset=function(){this.B.INIT&&!this.restore(this.B.INIT)&&this.ja("reset error")};m.save=function(){var a=new H(this);switch(this.B.Aa){case U.Aa:I(a,0,[this.Ca,this.F,this.Da,this.ca,this.ga,this.ya,this.za]);break;case V.Aa:I(a,0,[this.ia,this.K]),I(a,1,[this.N,this.O]),I(a,2,[this.I,this.da,this.ra,this.qa]),I(a,3,[this.X,this.u,this.P,this.ea,this.L])}return a.data()};
+m.restore=function(a){var b;if(a&&(b=a[0])&&b.length)switch(this.B.Aa){case U.Aa:return this.Ca=b[0],this.F=b[1],this.Da=b[2],this.ca=b[3],this.ga=b[4],this.ya=b[5],this.za=b[6],!0;case V.Aa:return this.ia=b[0],this.K=b[1],b=a[1],this.N=b[0],this.O=b[1],b=a[2],this.I=b[0],this.da=b[1],this.ra=b[2],this.qa=b[3],b=a[3],this.X=b[0],this.u=b[1],this.P=b[2],this.ea=b[3],this.L=b[4],!0}return!1};m.start=function(){};m.stop=function(){};m.Ad=function(a,b){var c=this.Ca;D(this,a,null,b,"STATUS0",c,!0);return c};
+m.Bd=function(a,b){var c=this.F;D(this,a,null,b,"STATUS1",c,!0);return c};m.Cd=function(a,b){var c=this.Da;D(this,a,null,b,"STATUS2",c,!0);return c};m.zd=function(a,b){var c=this.ca>>8-this.ga&255;D(this,a,null,b,"SHIFT.RESULT",c,!0);return c};m.Kd=function(a,b,c){D(this,a,b,c,"SHIFT.COUNT",null,!0);this.ga=b};m.Md=function(a,b,c){D(this,a,b,c,"SOUND1",null,!0);this.ya=b};m.Ld=function(a,b,c){D(this,a,b,c,"SHIFT.DATA",null,!0);this.ca=b<<8|this.ca>>8};
+m.Nd=function(a,b,c){D(this,a,b,c,"SOUND2",null,!0);this.za=b};m.Od=function(a,b,c){D(this,a,b,c,"WATCHDOG",null,!0)};function Id(a){var b=0,c=0,d=~a.X;for(a=0;10>a;a++)d&1&&(b=9-a),d>>=1;for(a=0;10>a;a++)d&1&&(c=9-a),d>>=1;return 10*b+c}
+m.Dd=function(a,b){var c=this.K,c=c&~V.Ja.nc;if((Dc(this.b)&64)<<1&&(c|=V.Ja.nc,c!=this.K)){var d,e;d=this.P&1;e=this.P>>1&7;switch(e){case V.Ka.Ta.pd:break;case V.Ka.Ta.Oc:this.X=this.X<<1|d;break;case V.Ka.Ta.Tc:d=Id(this);this.L[d]=V.Ka.Lb;ib(this,"doNVRCommand(): erase data at addr "+t(d));break;case V.Ka.Ta.Pc:this.u=this.u<<1|d;break;case V.Ka.Ta.td:d=Id(this);e=this.u&V.Ka.Lb;this.L[d]=e;ib(this,"doNVRCommand(): write data "+t(e)+" to addr "+t(d));break;case V.Ka.Ta.nd:d=Id(this);e=this.L[d];
+null==e&&(e=V.Ka.Lb);this.u=e;ib(this,"doNVRCommand():  read data "+t(e)+" from addr "+t(d));break;case V.Ka.Ta.od:this.u<<=1;this.ea=this.u&V.Ka.Lb+1;break;default:ib(this,"doNVRCommand(): unrecognized command 0x"+n(e,2))}}c&=~V.Ja.oc;this.ea&&(c|=V.Ja.oc);c&=~V.Ja.jc;this.J&&this.J.$b()&&(c|=V.Ja.jc);c&=~V.Ja.qc;this.Na&&this.Na.$b()&&(c|=V.Ja.qc);this.K=c;D(this,a,null,b,"FLAGS",c);return c};m.Pd=function(a,b,c){D(this,a,b,c,"BRIGHTNESS");this.ia=b};
+m.Sd=function(a,b,c){D(this,a,b,c,"NVR.LATCH");this.P=b};m.Rd=function(a,b,c){D(this,a,b,c,"DC012");a=b&3;switch(b>>2&3){case 0:this.I=this.I&-4|a;break;case 1:this.I=this.I&-13|a<<2;this.video&&(b=this.video,a=this.I,ib(b,"updateScrollOffset("+a+")"),b.hb!==a&&(b.hb=a,Jd(b,-1)));break;case 2:switch(a){case 0:this.da=~this.da;break;case 2:case 3:this.ra=3-a}break;case 3:this.qa=a}};
+m.Qd=function(a,b,c){D(this,a,b,c,"DC011");b&V.Ua.md?(b&=V.Ua.pc,this.O!=b&&(this.O=b,this.video&&(a=this.video,b=this.O==V.Ua.pc?50:60,ib(a,"updateRate("+b+")"),a.Zb=b))):(b&=V.Ua.ic,this.N!=b&&(this.N=b,this.video&&(a=this.N==V.Ua.ic?132:80,b=this.video,ib(b,"updateDimensions("+a+","+(80<a&&this.K&V.Ja.mc?14:24)+")"),b.ea=a,b.oa=b.yc,80<a&&b.oa--,Kd(b)&&Ld(b))))};U.Rb={0:T.prototype.Ad,1:T.prototype.Bd,2:T.prototype.Cd,3:T.prototype.zd};
+U.Sb={2:T.prototype.Kd,3:T.prototype.Md,4:T.prototype.Ld,5:T.prototype.Nd,6:T.prototype.Od};V.Rb={66:T.prototype.Dd};V.Sb={66:T.prototype.Pd,98:T.prototype.Sd,162:T.prototype.Rd,194:T.prototype.Qd};Ja(function(){for(var a=B(document,"pc8080","chipset"),b=0;b<a.length;b++){var c=a[b],d=y(c),d=new T(d);gb(d,c)}});
+function Md(a){w.call(this,"ROM",a,Md);this.A=null;this.F=a.addr;this.u=a.size;this.J=a.writable;this.B=a.alias;this.I=a.file;this.K=ba(this.I);if(this.I){a=this.I;var b=da(this.K);"json"!=b&&"hex"!=b&&(a=ra()+"/api/v1/dump?file="+this.I+"&format=bytes&decimal=true");var c=this;qa(a,null,!0,function(a,b,f){Nd(c,a,b,f)})}}Xa(Md);var Od=[0,5];Md.prototype.Qa=function(a,b,c,d){this.w=b;this.b=c;this.H=d;Pd(this)};
+Md.prototype.Ea=function(){if(this.Ra){if(this.H){var a=this.H,b=this.id,c=this.F,d=this.u,e=this.Ra,f=[],h;for(h in e){var g=e[h];"number"==typeof g&&(e[h]=g={o:g});var k=g.o,l=g.a;if(void 0!==k){var q=f,k=[k>>>0,h],p=ma(q,k,a.Ya);0>p&&q.splice(-(p+1),0,k)}l&&(g.a=l.replace(/''/g,'"'))}a.J.push({Ie:b,G:c,Fd:d,Ra:e,rc:f})}delete this.Ra}return!0};Md.prototype.Ha=function(){return!0};
+function Nd(a,b,c,d){if(d)a.ja("Unable to load system ROM (error "+d+": "+b+")");else{ab(a.Yb,b,c);if("["==c.charAt(0)||"{"==c.charAt(0))try{var e=eval("("+c+")"),f=e.bytes,h=e.data;if(f)a.A=f;else if(h)for(a.A=Array(4*h.length),d=c=0;c<h.length;c++)a.A[d++]=h[c]&255,a.A[d++]=h[c]>>8&255,a.A[d++]=h[c]>>16&255,a.A[d++]=h[c]>>24&255;else a.A=e;a.Ra=e.symbols;if(!a.A.length){v("Empty ROM: "+b);return}if(1==a.A.length){v(a.A[0]);return}}catch(g){a.ja("ROM data error: "+g.message);return}else for(b=c.replace(/\n/gm,
+" ").replace(/ +$/,"").split(" "),a.A=Array(b.length),e=0;e<b.length;e++)a.A[e]=aa(b[e],16);Pd(a)}}
+function Pd(a){if(!mb(a))if(!a.I)E(a);else if(a.A&&a.w){a.u||(a.u=a.A.length);if(a.A.length!=a.u)nb(a,"ROM size (0x"+n(a.A.length)+") does not match specified size ("+("0x"+n(a.u))+")");else if(Qd(a,a.F)){var b=[];"number"==typeof a.B?b.push(a.B):null!=a.B&&a.B.length&&(b=a.B);for(var c=0;c<b.length;c++){for(var d=a,e=b[c],f=d.w,h=d.u,g=[],k=d.F>>>f.pa;0<h&&k<f.Y.length;)g.push(f.Y[k++]),h-=f.Ga;f=d.w;d=d.u;h=0;for(e>>>=f.pa;0<d&&e<f.Y.length;){k=g[h++];if(!k)break;f.Y[e++]=k;d-=f.Ga}}delete a.A}E(a)}}
+function Qd(a,b){if(xb(a.w,b,a.u,a.J?1:Yb)){var c;for(c=0;c<a.A.length;c++)Cb(a.w,b+c,a.A[c]);if(a.J&&256==b){for(c=0;c<Od.length;c++)Cb(a.w,Od[c],118);Lc(a.b,function(a){return function(b){if(0<=Od.indexOf(b)){var c=!1,h=a.b,g=a.H;if(5==b)switch(c=!0,h.T){case 2:Rd(a,String.fromCharCode(h.V));break;case 9:for(var k=Rc(h),l="",q=255;q--;){var p=a.b.aa(k++);if(36==p)break;l+=String.fromCharCode(p)}Rd(a,l);break;default:c=!1}c?Fd.call(h):g&&(a.g("\nCP/M vector "+t(b)),G(h,b),g.na());b=!0}else b=!1;
+return b}}(a));Nc(a.b,b)}return!0}return!1}function Rd(a,b){b=b.replace(/\r/g,"");a.Fa&&(a.Fa.value+=b,a.Fa.scrollTop=a.Fa.scrollHeight)}Ja(function(){for(var a=B(document,"pc8080","rom"),b=0;b<a.length;b++){var c=a[b],d=y(c),d=new Md(d);gb(d,c)}});function Sd(a){w.call(this,"RAM",a,Sd);this.B=a.addr;this.u=a.size;this.A=!1}Xa(Sd);m=Sd.prototype;m.Qa=function(a,b,c,d){this.w=b;this.b=c;this.H=d;E(this)};m.Ea=function(a,b){b||this.reset();return!0};m.Ha=function(a){return a?this.save():!0};
+m.reset=function(){!this.A&&this.u&&xb(this.w,this.B,this.u,1)&&(this.A=!0);this.A||v("No RAM allocated")};m.save=function(){return null};m.restore=function(){return!0};Ja(function(){for(var a=B(document,"pc8080","ram"),b=0;b<a.length;b++){var c=a[b],d=y(c),d=new Sd(d);gb(d,c)}});function Td(a){w.call(this,"Keyboard",a,Td,65536);(a=a.model)&&!Ud[a]&&La("Unrecognized Keyboard model: "+a);this.w=Ud[a]||{};this.reset();E(this)}Xa(Td);
+var Vd={Aa:1978.1,C:{},hc:{65:37,68:39,76:32},xb:{},Va:{"1p":49,"2p":50,coin:51,left:37,right:39,fire:32}},W={Aa:100,C:{},hc:{},xb:{},Va:{setup:120},Qc:{Ba:130,INIT:127},La:{Ba:130,dd:1,cd:2,bd:4,ad:8,ed:16,lc:32,kc:63,qd:64,ae:128,INIT:0},$c:127};W.C[46]=3;W.C[80]=5;W.C[79]=6;W.C[89]=7;W.C[84]=8;W.C[87]=9;W.C[81]=10;W.C[39]=16;W.C[221]=20;W.C[219]=21;W.C[73]=22;W.C[85]=23;W.C[82]=24;W.C[69]=25;W.C[49]=26;W.C[37]=32;W.C[40]=34;W.C[117]=35;W.C[19]=35;W.C[192]=36;W.C[189]=37;W.C[57]=38;W.C[55]=39;
 W.C[52]=40;W.C[51]=41;W.C[27]=42;W.C[38]=48;W.C[114]=49;W.C[112]=50;W.C[8]=51;W.C[187]=52;W.C[48]=53;W.C[56]=54;W.C[54]=55;W.C[53]=56;W.C[50]=57;W.C[9]=58;W.C[103]=64;W.C[115]=65;W.C[113]=66;W.C[96]=67;W.C[118]=68;W.C[220]=69;W.C[76]=70;W.C[75]=71;W.C[71]=72;W.C[70]=73;W.C[65]=74;W.C[104]=80;W.C[2013]=81;W.C[98]=82;W.C[97]=83;W.C[222]=85;W.C[186]=86;W.C[74]=87;W.C[72]=88;W.C[68]=89;W.C[83]=90;W.C[110]=96;W.C[116]=97;W.C[101]=98;W.C[100]=99;W.C[13]=100;W.C[190]=101;W.C[188]=102;W.C[78]=103;
-W.C[66]=104;W.C[88]=105;W.C[119]=106;W.C[105]=112;W.C[99]=113;W.C[102]=114;W.C[109]=115;W.C[191]=117;W.C[77]=118;W.C[32]=119;W.C[86]=120;W.C[67]=121;W.C[90]=122;W.C[120]=123;W.C[17]=124;W.C[16]=125;W.C[20]=126;W.wb={l4:W.Ka.$c,l3:W.Ka.Zc,l2:W.Ka.Yc,l1:W.Ka.Xc,locked:W.Ka.ad,local:W.Ka.ic,online:~W.Ka.ic};var Qd={SI1978:Rd,VT100:W};
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+function ag(a,b,c,d,e){if(!b.D.ua){b.D.ua=!0;if(b.Ea){var f=null;e&&((f=Sf(c,b.id))||(f=Sf(c,b.id.replace(/[a-z0-9]\./i,"."))));"string"===typeof f&&(f=null);!b.Ea(f,d)&&f&&(v("Unable to restore state for "+b.type),a.ca&&!a.ea?(c.clear(),a.A=Vf,window&&window.location.reload()):a.da=!0,b.Ea(null),e=!1)}if(!d&&b.xc)for(a=b.xc.split("|"),c=0;c<a.length;c++)b.status(a[c])}return e}
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-function Tf(a,b){var c=a.u;c||(c=ua("user"),void 0!==c?!c&&b&&(c=null,window&&(c=window.prompt("Saving machine states on the pcjs.org server is currently unsupported.\n\nIf you're running your own server, enter your user ID below.","")),c&&((c=$f(a,c))||a.ia("The user ID is invalid."))):b&&a.ia("Browser local storage is not available"));return c}
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