diff --git a/devices/pc8080/machine/vt100/debugger/machine.xml b/devices/pc8080/machine/vt100/debugger/machine.xml
index 179c55a18..0c339f55b 100644
--- a/devices/pc8080/machine/vt100/debugger/machine.xml
+++ b/devices/pc8080/machine/vt100/debugger/machine.xml
@@ -6,7 +6,7 @@
 	<cpu id="cpu8080" model="8080" cycles="2764800"/>
 	<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"
+	<video id="video" screenWidth="1600" screenHeight="960" smoothing="false" interruptRate="60"
 		   fontROM="/devices/pc8080/rom/vt100/23-018E2.json" fontColor="white" cellWidth="10" cellHeight="10"
 		   bufferAddr="0x2000" bufferRAM="true" bufferFormat="vt100" bufferCols="80" bufferRows="24" pos="left" padding="8px">
 		<menu>
@@ -25,6 +25,7 @@
 	</video>
 	<chipset id="chipset" model="VT100"/>
 	<keyboard id="keyboard" model="VT100"/>
+	<serial id="serial0" adapter="0"/>
 	<panel ref="/devices/pc8080/panel/wide.xml"/>
-	<debugger id="debugger" messages="mem" commands="s 8086"/>
+	<debugger id="debugger" messages="mem|port|keyboard" commands="s 8086"/>
 </machine>
diff --git a/devices/pc8080/machine/vt100/machine.xml b/devices/pc8080/machine/vt100/machine.xml
index 4d6b1b236..5a498fb10 100644
--- a/devices/pc8080/machine/vt100/machine.xml
+++ b/devices/pc8080/machine/vt100/machine.xml
@@ -6,7 +6,7 @@
 	<cpu id="cpu8080" model="8080" cycles="2764800"/>
 	<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"
+	<video id="video" screenWidth="1600" screenHeight="960" smoothing="false" interruptRate="60"
 		   fontROM="/devices/pc8080/rom/vt100/23-018E2.json" fontColor="white" cellWidth="10" cellHeight="10"
 		   bufferAddr="0x2000" bufferRAM="true" bufferFormat="vt100" bufferCols="80" bufferRows="24" padding="8px">
 		<menu>
diff --git a/devices/pc8080/rom/vt100/README.md b/devices/pc8080/rom/vt100/README.md
index d7592b691..32d310330 100644
--- a/devices/pc8080/rom/vt100/README.md
+++ b/devices/pc8080/rom/vt100/README.md
@@ -15,8 +15,9 @@ The combined contents of those ROMs have been stored as an 8Kb JSON image in [VT
 As Trammell Hudson's [VT100 Page](https://trmm.net/VT100) explains:
 
 	There are four 8316E ROM chips for the 8080 CPU on the logic board. Since they are custom mask ROMs,
-	Digital was able to have a different chip-select bit pattern and avoided having separate NOT gates on the inputs.
-	Note that the schematic appears to be incorrect -- E56 is the low order, and E40 is the high order address bits.
+	Digital was able to have a different chip-select bit pattern and avoided having separate NOT gates on
+	the inputs.  Note that the schematic appears to be incorrect -- E56 is the low order, and E40 is the
+	high order address bits.
 
 He then describes the memory map as follows:
 
@@ -67,8 +68,8 @@ and passed on to the PC8080 Debugger.  Here are the rebuild steps:
 	grep -E "[0-9]+ [0-9A-D]+.*;;" VT100.lst | sed -E "s/ *[0-9]+ ([0-9A-F]+).*;(;.*)/     \1   .   \2/" > VT100.map
 	filedump --file=VT100.bin --format=bytes --output=VT100.json --comments --overwrite
 
-You can omit `--comments` to reduce the size of the [VT100.json](VT100.json) file.
+You can omit `--comments` from the filedump command to reduce the size of the [VT100.json](VT100.json) file.
 
 Some [VT100.asm](VT100.asm) clean-up remains, because there are still chunks of data that were incorrectly disassembled as code.
-From a reassembly standpoint, it doesn't matter too much, because such instructions get reassembled into the same original binary
-patterns, but from a readability standpoint, it's a nuisance.
+From a reassembly standpoint, it doesn't matter too much, because all the 8080 instructions unambiguously reassemble into their
+original binary patterns, but from a readability standpoint, it's a nuisance.
diff --git a/devices/pc8080/rom/vt100/VT100.asm b/devices/pc8080/rom/vt100/VT100.asm
index bd7eb03c6..9044a6870 100644
--- a/devices/pc8080/rom/vt100/VT100.asm
+++ b/devices/pc8080/rom/vt100/VT100.asm
@@ -212,9 +212,19 @@ X00f5:	push	d
 
 	pop	d
 	jmp	X0875
-;;
-;;  Keyboard interrupt handler
-;;
+;
+;   Keyboard interrupt handler
+;
+;   The "Keys Flag Byte/Buffer" at 0x2068 contains the following bits:
+;
+;	0-1	Key counter
+;	  2	Key counter overflow bit
+;	  3	Setup
+;	  4	Control
+;	  5	Shift
+;	  6	Caps Lock
+;	  7	Last Key
+;
 X00fd:	push	psw
 	in	82h		;; Read from keyboard port
 	push	h
diff --git a/modules/pc8080/lib/chipset.js b/modules/pc8080/lib/chipset.js
index 5fee24b74..3b07b5b8b 100644
--- a/modules/pc8080/lib/chipset.js
+++ b/modules/pc8080/lib/chipset.js
@@ -206,7 +206,7 @@ ChipSet.VT100 = {
     MODEL:          100.0,
     FLAGS_BUFFER: {
         PORT:       0x42,               // read-only
-        XMIT:       0x01,               // active if SET
+        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
@@ -841,7 +841,7 @@ ChipSet.prototype.inVT100FlagsBuffer = function(port, addrFrom)
         b |= ChipSet.VT100.FLAGS_BUFFER.NVR_DATA;
     }
     this.bFlagsBuffer = b;
-    this.printMessageIO(port, null, addrFrom, "FLAGS.BUFFER", b, true);
+    this.printMessageIO(port, null, addrFrom, "FLAGS.BUFFER", b);
     return b;
 };
 
@@ -855,7 +855,7 @@ ChipSet.prototype.inVT100FlagsBuffer = function(port, addrFrom)
  */
 ChipSet.prototype.outVT100Brightness = function(port, b, addrFrom)
 {
-    this.printMessageIO(port, b, addrFrom, "BRIGHTNESS", null, true);
+    this.printMessageIO(port, b, addrFrom, "BRIGHTNESS");
     this.bBrightness = b;
 };
 
@@ -869,7 +869,7 @@ ChipSet.prototype.outVT100Brightness = function(port, b, addrFrom)
  */
 ChipSet.prototype.outVT100NVRLatch = function(port, b, addrFrom)
 {
-    this.printMessageIO(port, b, addrFrom, "NVR.LATCH", null, true);
+    this.printMessageIO(port, b, addrFrom, "NVR.LATCH");
     this.bNVRLatch = b;
 };
 
@@ -883,7 +883,7 @@ ChipSet.prototype.outVT100NVRLatch = function(port, b, addrFrom)
  */
 ChipSet.prototype.outVT100DC012 = function(port, b, addrFrom)
 {
-    this.printMessageIO(port, b, addrFrom, "DC012", null, true);
+    this.printMessageIO(port, b, addrFrom, "DC012");
     this.bDC012 = b;
 };
 
@@ -897,7 +897,7 @@ ChipSet.prototype.outVT100DC012 = function(port, b, addrFrom)
  */
 ChipSet.prototype.outVT100DC011 = function(port, b, addrFrom)
 {
-    this.printMessageIO(port, b, addrFrom, "DC011", null, true);
+    this.printMessageIO(port, b, addrFrom, "DC011");
     this.bDC011 = b;
 };
 
diff --git a/modules/pc8080/lib/keyboard.js b/modules/pc8080/lib/keyboard.js
index 14e2669b5..d409c4942 100644
--- a/modules/pc8080/lib/keyboard.js
+++ b/modules/pc8080/lib/keyboard.js
@@ -277,6 +277,19 @@ Keyboard.SI1978 = {
 Keyboard.VT100 = {
     MODEL:          100.0,
     SOFTCODES: {},
+    /*
+     * Reading port 0x82 returns a key address from the VT100 keyboard's UART data output.
+     *
+     * Every time a keyboard scan is initiated (by setting the START bit of the status byte),
+     * an internal address index is reset to zero, and an interrupt is generated for each entry
+     * in the aKeysPressed array, along with a final interrupt for KEYLAST.
+     */
+    ADDRESS: {
+        PORT:       0x82
+    },
+    /*
+     * Writing port 0x82 updates the VT100's keyboard status byte via the keyboard's UART data input.
+     */
     STATUS: {
         PORT:       0x82,               // write-only
         LED4:       0x01,
@@ -299,7 +312,8 @@ Keyboard.VT100 = {
          */
         CLICK:      0x80,
         INIT:       0x00
-    }
+    },
+    KEYLAST:        0x7F
 };
 
 Keyboard.VT100.KEYMAP = {};
@@ -501,6 +515,7 @@ Keyboard.prototype.setBinding = function(sHTMLType, sBinding, control, sValue)
  */
 Keyboard.prototype.initBus = function(cmp, bus, cpu, dbg)
 {
+    this.cpu = cpu;
     this.dbg = dbg;     // NOTE: The "dbg" property must be set for the message functions to work
     this.chipset = cmp.getMachineComponent("ChipSet");
     bus.addPortInputTable(this, this.config.portsInput);
@@ -542,7 +557,8 @@ Keyboard.prototype.powerDown = function(fSave, fShutdown)
 
 Keyboard.VT100.INIT = [
     [
-        Keyboard.VT100.STATUS.INIT
+        Keyboard.VT100.STATUS.INIT,
+        0                               // iKeyNext
     ]
 ];
 
@@ -554,14 +570,16 @@ Keyboard.VT100.INIT = [
 Keyboard.prototype.reset = function()
 {
     /*
-     * As keyDown events are encountered, a corresponding "softcode" property in keysPressed
-     * is set to the timestamp of the keyDown event.  When the corresponding keyUp event occurs,
-     * we look at the elapsed time: if it is less than MINPRESSTIME, then we move the key
-     * to keysToRelease and set a timeout handler to release the key later; otherwise, we process
-     * the keyUp event immediately.
+     * As keyDown events are encountered, a corresponding "softCode" is looked up.  If one is found,
+     * then an entry for the key is added to the aKeysPressed array.  Each entry contains:
+     *
+     *      softCode:           number or string representing the key pressed
+     *      msDown:             timestamp of the most recent "down" event
+     *      fAutoRelease:       true to auto-release the key after MINPRESSTIME (set when "up" occurs too quickly)
+     *
+     * When the key is finally released (or auto-released), its entry is removed from the array.
      */
-    this.keysPressed = {};
-    this.keysToRelease = {};
+    this.aKeysPressed = [];
 
     if (this.config.INIT && !this.restore(this.config.INIT)) {
         this.notice("reset error");
@@ -609,6 +627,7 @@ Keyboard.prototype.restore = function(data)
         case Keyboard.VT100.MODEL:
             this.bVT100Status = a[0];
             this.updateLEDs(this.bVT100Status & Keyboard.VT100.STATUS.LEDS);
+            this.iKeyNext = a[1];
             return true;
         }
     }
@@ -656,12 +675,17 @@ Keyboard.prototype.updateLEDs = function(bLEDs)
 /**
  * getSoftCode(keyCode)
  *
+ * Returns a number if the keyCode exists in the KEYMAP, or a string if the keyCode has a soft-code string.
+ *
  * @this {Keyboard}
- * @return {string|null}
+ * @return {string|number|null}
  */
 Keyboard.prototype.getSoftCode = function(keyCode)
 {
     keyCode = Keyboard.ALTCODES[keyCode] || keyCode;
+    if (this.config.KEYMAP[keyCode]) {
+        return keyCode;
+    }
     for (var sSoftCode in this.config.SOFTCODES) {
         if (this.config.SOFTCODES[sSoftCode] === keyCode) {
             return sSoftCode;
@@ -682,10 +706,10 @@ Keyboard.prototype.onKeyDown = function(event, fDown)
 {
     var fPass = true;
     var keyCode = event.keyCode;
-    var sSoftCode = this.getSoftCode(keyCode);
+    var softCode = this.getSoftCode(keyCode);
 
-    if (sSoftCode) {
-        fPass = this.onSoftKeyDown(sSoftCode, fDown);
+    if (softCode) {
+        fPass = this.onSoftKeyDown(softCode, fDown);
         event.preventDefault();
     }
 
@@ -697,36 +721,65 @@ Keyboard.prototype.onKeyDown = function(event, fDown)
 };
 
 /**
- * onSoftKeyDown(sSoftCode, fDown)
+ * indexOfSoftKey(softCode)
  *
  * @this {Keyboard}
- * @param {string} sSoftCode
+ * @param {number|string} softCode
+ * @return {number} index of softCode in aKeysPressed, or -1 if not found
+ */
+Keyboard.prototype.indexOfSoftKey = function(softCode)
+{
+    var i;
+    for (i = 0; i < this.aKeysPressed.length; i++) {
+        if (this.aKeysPressed[i].softCode == softCode) return i;
+    }
+    return -1;
+};
+
+/**
+ * onSoftKeyDown(softCode, fDown)
+ *
+ * @this {Keyboard}
+ * @param {number|string} softCode
  * @param {boolean} fDown is true for a down event, false for up
  * @return {boolean} true to pass the event along, false to consume it
  */
-Keyboard.prototype.onSoftKeyDown = function(sSoftCode, fDown)
+Keyboard.prototype.onSoftKeyDown = function(softCode, fDown)
 {
+    var i = this.indexOfSoftKey(softCode);
     if (fDown) {
-        // this.println(sSoftCode + " down");
-        this.keysPressed[sSoftCode] = Date.now();
-        delete this.keysToRelease[sSoftCode];
-    } else {
-        // this.println(sSoftCode + " up");
-        var msDown = this.keysPressed[sSoftCode];
-        if (msDown) {
-            var msElapsed = Date.now() - msDown;
-            if (msElapsed < Keyboard.MINPRESSTIME) {
-                // this.println(sSoftCode + " released after only " + msElapsed + "ms");
-                this.keysToRelease[sSoftCode] = msDown;
-                this.checkSoftKeysToRelease();
-                return true;
+        // this.println(softCode + " down");
+        if (i < 0) {
+            this.aKeysPressed.push({
+                softCode: softCode,
+                msDown: Date.now(),
+                fAutoRelease: false
+            });
+        } else {
+            this.aKeysPressed[i].msDown = Date.now();
+            this.aKeysPressed[i].fAutoRelease = false;
+        }
+    } else if (i >= 0) {
+        // this.println(softCode + " up");
+        if (!this.aKeysPressed[i].fAutoRelease) {
+            var msDown = this.aKeysPressed[i].msDown;
+            if (msDown) {
+                var msElapsed = Date.now() - msDown;
+                if (msElapsed < Keyboard.MINPRESSTIME) {
+                    // this.println(softCode + " released after only " + msElapsed + "ms");
+                    this.aKeysPressed[i].fAutoRelease = true;
+                    this.checkSoftKeysToRelease();
+                    return true;
+                }
             }
         }
-        delete this.keysPressed[sSoftCode];
+        this.aKeysPressed.splice(i, 1);
+    } else {
+        // this.println(softCode + " up with no down?");
     }
 
     if (this.chipset) {
-        switch(sSoftCode) {
+        switch(softCode) {
         case '1p':
             this.chipset.updateStatus1(ChipSet.SI1978.STATUS1.P1, fDown);
             break;
@@ -762,21 +815,30 @@ Keyboard.prototype.onSoftKeyDown = function(sSoftCode, fDown)
  */
 Keyboard.prototype.checkSoftKeysToRelease = function()
 {
+    var i = 0;
     var msDelayMin = -1;
-    var asSoftCodes = Object.keys(this.keysToRelease);
-    for (var i = 0; i < asSoftCodes.length; i++) {
-        var sSoftCode = asSoftCodes[i];
-        var msDown = this.keysToRelease[sSoftCode];
-        var msElapsed = Date.now() - msDown;
-        var msDelay = Keyboard.MINPRESSTIME - msElapsed;
-        if (msDelay > 0) {
-            if (msDelayMin < 0 || msDelayMin > msDelay) {
-                msDelayMin = msDelay;
+    while (i < this.aKeysPressed.length) {
+        if (this.aKeysPressed[i].fAutoRelease) {
+            var softCode = this.aKeysPressed[i].softCode;
+            var msDown = this.aKeysPressed[i].msDown;
+            var msElapsed = Date.now() - msDown;
+            var msDelay = Keyboard.MINPRESSTIME - msElapsed;
+            if (msDelay > 0) {
+                if (msDelayMin < 0 || msDelayMin > msDelay) {
+                    msDelayMin = msDelay;
+                }
+            } else {
+                /*
+                 * Because the key is already in the auto-release state, this next call guarantees that the
+                 * key will be removed from the array; a consequence of that removal, however, is that we must
+                 * reset our array index to zero.
+                 */
+                this.onSoftKeyDown(softCode, false);
+                i = 0;
+                continue;
             }
-        } else {
-            delete this.keysToRelease[sSoftCode];
-            this.onSoftKeyDown(sSoftCode, false);
         }
+        i++;
     }
     if (msDelayMin >= 0) {
         var kbd = this;
@@ -784,6 +846,26 @@ Keyboard.prototype.checkSoftKeysToRelease = function()
     }
 };
 
+/**
+ * inVT100UARTAddress(port, addrFrom)
+ *
+ * @this {Keyboard}
+ * @param {number} port (0x82)
+ * @param {number} [addrFrom] (not defined if the Debugger is trying to write the specified port)
+ * @return {number} simulated port value
+ */
+Keyboard.prototype.inVT100UARTAddress = function(port, addrFrom)
+{
+    var b = 0;
+    if (this.iKeyNext >= 0 && this.iKeyNext < this.aKeysPressed.length - 1) {
+        var softCode = this.aKeysPressed[this.iKeyNext++];
+        b = Keyboard.VT100.KEYMAP[softCode];
+    }
+    if (!b) b = Keyboard.VT100.KEYLAST;
+    this.printMessageIO(port, null, addrFrom, "KBDUART.ADDRESS", b);
+    return b;
+};
+
 /**
  * outVT100UARTStatus(port, b, addrFrom)
  *
@@ -794,20 +876,20 @@ Keyboard.prototype.checkSoftKeysToRelease = function()
  */
 Keyboard.prototype.outVT100UARTStatus = function(port, b, addrFrom)
 {
-    this.printMessageIO(port, b, addrFrom, "KBDUART.STATUS", null, true);
+    this.printMessageIO(port, b, addrFrom, "KBDUART.STATUS");
     this.bVT100Status = b;
     this.updateLEDs(b & Keyboard.VT100.STATUS.LEDS);
-    /*
     if (b & Keyboard.VT100.STATUS.START) {
-        console.log("keyboard scan initiated");
+        this.iKeyNext = 0;
+        this.cpu.requestINTR(1);
     }
-    */
 };
 
 /*
  * Port notification tables
  */
 Keyboard.VT100.portsInput = {
+    0x82: Keyboard.prototype.inVT100UARTAddress
 };
 
 Keyboard.VT100.portsOutput = {
diff --git a/modules/pc8080/lib/serialport.js b/modules/pc8080/lib/serialport.js
new file mode 100644
index 000000000..226735532
--- /dev/null
+++ b/modules/pc8080/lib/serialport.js
@@ -0,0 +1,519 @@
+/**
+ * @fileoverview Implements the PC8080 SerialPort component.
+ * @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a>
+ * @version 1.0
+ * Created 2016-Aug-08
+ *
+ * Copyright © 2012-2016 Jeff Parsons <Jeff@pcjs.org>
+ *
+ * This file is part of PCjs, a computer emulation software project at <http://pcjs.org/>.
+ *
+ * PCjs is free software: you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation, either version 3
+ * of the License, or (at your option) any later version.
+ *
+ * PCjs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
+ * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with PCjs.  If not,
+ * see <http://www.gnu.org/licenses/gpl.html>.
+ *
+ * You are required to include the above copyright notice in every source code file of every
+ * copy or modified version of this work, and to display that copyright notice on every screen
+ * that loads or runs any version of this software (see COPYRIGHT in /modules/shared/lib/defines.js).
+ *
+ * Some PCjs files also attempt to load external resource files, such as character-image files,
+ * ROM files, and disk image files. Those external resource files are not considered part of PCjs
+ * for purposes of the GNU General Public License, and the author does not claim any copyright
+ * as to their contents.
+ */
+
+"use strict";
+
+if (NODE) {
+    var str         = require("../../shared/lib/strlib");
+    var web         = require("../../shared/lib/weblib");
+    var Component   = require("../../shared/lib/component");
+    var Messages    = require("./messages");
+    var ChipSet     = require("./chipset");
+    var State       = require("./state");
+}
+
+/**
+ * SerialPort(parmsSerial)
+ *
+ * The SerialPort component has the following component-specific (parmsSerial) properties:
+ *
+ *      adapter: 0 if not defined
+ *
+ *      binding: name of a control (based on its "binding" attribute) to bind to this port's I/O
+ *
+ *      tabSize: set to a non-zero number to convert tabs to spaces (applies only to output to
+ *      the above binding); default is 0 (no conversion)
+ *
+ * In the future, we may support 'port' and 'irq' properties that allow the machine to define a
+ * non-standard serial port configuration, instead of only our pre-defined 'adapter' configurations.
+ *
+ * NOTE: Since the XSL file defines 'adapter' as a number, not a string, there's no need to use
+ * parseInt(), and as an added benefit, we don't need to worry about whether a hex or decimal format
+ * was used.
+ *
+ * @constructor
+ * @extends Component
+ * @param {Object} parmsSerial
+ */
+function SerialPort(parmsSerial) {
+
+    this.iAdapter = +parmsSerial['adapter'];
+
+    switch (this.iAdapter) {
+    case 0:
+        this.portBase = 0;
+        this.nIRQ = 2;
+        break;
+    default:
+        Component.warning("Unrecognized serial adapter #" + this.iAdapter);
+        return;
+    }
+    /**
+     * consoleOutput becomes a string that records serial port output if the 'binding' property is set to the
+     * reserved name "console".  Nothing is written to the console, however, until a linefeed (0x0A) is output
+     * or the string length reaches a threshold (currently, 1024 characters).
+     *
+     * @type {string|null}
+     */
+    this.consoleOutput = null;
+
+    /**
+     * controlIOBuffer is a DOM element, if any, bound to the port (currently used for output only; see echoByte()).
+     *
+     * @type {Object}
+     */
+    this.controlIOBuffer = null;
+
+    /*
+     * 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
+     * number of spaces.
+     *
+     * charBOL, if nonzero, is a character to automatically output at the beginning of every line.  This probably
+     * isn't generally useful; I use it internally to preformat serial output.
+     */
+    this.tabSize = parmsSerial['tabSize'];
+    this.charBOL = parmsSerial['charBOL'];
+    this.iLogicalCol = 0;
+
+    Component.call(this, "SerialPort", parmsSerial, SerialPort, Messages.SERIAL);
+
+    var sBinding = parmsSerial['binding'];
+    if (sBinding == "console") {
+        this.consoleOutput = "";
+    } else {
+        /*
+         * NOTE: If sBinding is not the name of a valid Control Panel DOM element, this call does nothing.
+         */
+        Component.bindExternalControl(this, sBinding, SerialPort.sIOBuffer);
+    }
+}
+
+/*
+ * class SerialPort
+ * 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())
+ *
+ * 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
+ * initializing such properties in the constructor is a better way to go -- even though it's more code -- because
+ * JavaScript compilers are supposed to be happier when the underlying object structures aren't constantly changing.
+ *
+ * Besides, I'm not sure I want to get into documenting every property this way, for this or any/every other class,
+ * let alone getting into which ones should be considered private or protected, because PCjs isn't really a library
+ * for third-party apps.
+ */
+
+Component.subclass(SerialPort);
+
+/*
+ * Internal name used for the I/O buffer control, if any, that we bind to the SerialPort.
+ *
+ * Alternatively, if SerialPort wants to use another component's control (eg, the Panel's
+ * "print" control), it can specify the name of that control with the 'binding' property.
+ *
+ * For that binding to succeed, we also need to know the target component; for now, that's
+ * been hard-coded to "Panel", in part because that's one of the few components we can rely
+ * upon initializing before we do, but it would be a simple matter to include a component type
+ * or ID as part of the 'binding' property as well, if we need more flexibility later.
+ */
+SerialPort.sIOBuffer = "buffer";
+
+/**
+ * setBinding(sHTMLType, sBinding, control, sValue)
+ *
+ * @this {SerialPort}
+ * @param {string|null} sHTMLType is the type of the HTML control (eg, "button", "list", "text", "submit", "textarea", "canvas")
+ * @param {string} sBinding is the value of the 'binding' parameter stored in the HTML control's "data-value" attribute (eg, "buffer")
+ * @param {Object} control is the HTML control DOM object (eg, HTMLButtonElement)
+ * @param {string} [sValue] optional data value
+ * @return {boolean} true if binding was successful, false if unrecognized binding request
+ */
+SerialPort.prototype.setBinding = function(sHTMLType, sBinding, control, sValue)
+{
+    var serial = this;
+
+    switch (sBinding) {
+    case SerialPort.sIOBuffer:
+        this.bindings[sBinding] = this.controlIOBuffer = control;
+
+        /*
+         * By establishing an onkeypress handler here, we make it possible for DOS commands like
+         * "CTTY COM1" to more or less work (use "CTTY CON" to restore control to the DOS console).
+         */
+        control.onkeydown = function onKeyDown(event) {
+            /*
+             * This is required in addition to onkeypress, because it's the only way to prevent
+             * BACKSPACE (keyCode 8) from being interpreted by the browser as a "Back" operation;
+             * moreover, not all browsers generate an onkeypress notification for BACKSPACE.
+             *
+             * A related problem exists for Ctrl-key combinations in most Windows-based browsers
+             * (eg, IE, Edge, Chrome for Windows, etc), because keys like Ctrl-C and Ctrl-S have
+             * special meanings (eg, Copy, Save).  To the extent the browser will allow it, we
+             * attempt to disable that default behavior when this control receives an onkeydown
+             * event for one of those keys (probably the only event the browser generates for them).
+             */
+            event = event || window.event;
+            var keyCode = event.keyCode;
+            if (keyCode === 0x08 || event.ctrlKey && keyCode >= 0x41 && keyCode <= 0x5A) {
+                if (event.preventDefault) event.preventDefault();
+                if (keyCode > 0x40) keyCode -= 0x40;
+                // serial.sendRBR([keyCode]);
+            }
+            return true;
+        };
+
+        control.onkeypress = function onKeyPress(event) {
+            /*
+             * Browser-independent keyCode extraction; refer to onKeyPress() and the other key event
+             * handlers in keyboard.js.
+             */
+            event = event || window.event;
+            var keyCode = event.which || event.keyCode;
+            // serial.sendRBR([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
+             * selected keys (eg, the SPACE key, whose default behavior is to scroll the page), we must
+             * now call it for *all* keys, so that the keyCode isn't added to the control immediately,
+             * on top of whatever the machine is echoing back, resulting in double characters.
+             */
+            if (event.preventDefault) event.preventDefault();
+            return true;
+        };
+
+        /*
+         * Now that we've added an onkeypress handler that calls preventDefault() for ALL keys, the control
+         * itself no longer needs the "readonly" attribute; we primarily need to remove it for iOS browsers,
+         * so that the soft keyboard will activate, but it shouldn't hurt to remove the attribute for all browsers.
+         */
+        control.removeAttribute("readonly");
+
+        return true;
+
+    default:
+        break;
+    }
+    return false;
+};
+
+/**
+ * initBus(cmp, bus, cpu, dbg)
+ *
+ * @this {SerialPort}
+ * @param {Computer} cmp
+ * @param {Bus} bus
+ * @param {CPUState} cpu
+ * @param {Debugger} dbg
+ */
+SerialPort.prototype.initBus = function(cmp, bus, cpu, dbg)
+{
+    this.bus = bus;
+    this.cpu = cpu;
+    this.dbg = dbg;
+    this.chipset = cmp.getMachineComponent("ChipSet");
+    bus.addPortInputTable(this, SerialPort.aPortInput, this.portBase);
+    bus.addPortOutputTable(this, SerialPort.aPortOutput, this.portBase);
+    this.setReady();
+};
+
+/**
+ * powerUp(data, fRepower)
+ *
+ * @this {SerialPort}
+ * @param {Object|null} data
+ * @param {boolean} [fRepower]
+ * @return {boolean} true if successful, false if failure
+ */
+SerialPort.prototype.powerUp = function(data, fRepower)
+{
+    if (!fRepower) {
+        if (!data || !this.restore) {
+            this.reset();
+        } else {
+            if (!this.restore(data)) return false;
+        }
+    }
+    return true;
+};
+
+/**
+ * powerDown(fSave, fShutdown)
+ *
+ * @this {SerialPort}
+ * @param {boolean} [fSave]
+ * @param {boolean} [fShutdown]
+ * @return {Object|boolean} component state if fSave; otherwise, true if successful, false if failure
+ */
+SerialPort.prototype.powerDown = function(fSave, fShutdown)
+{
+    return fSave? this.save() : true;
+};
+
+/**
+ * reset()
+ *
+ * @this {SerialPort}
+ */
+SerialPort.prototype.reset = function()
+{
+    this.initState();
+};
+
+/**
+ * save()
+ *
+ * This implements save support for the SerialPort component.
+ *
+ * @this {SerialPort}
+ * @return {Object}
+ */
+SerialPort.prototype.save = function()
+{
+    var state = new State(this);
+    state.set(0, this.saveRegisters());
+    return state.data();
+};
+
+/**
+ * restore(data)
+ *
+ * This implements restore support for the SerialPort component.
+ *
+ * @this {SerialPort}
+ * @param {Object} data
+ * @return {boolean} true if successful, false if failure
+ */
+SerialPort.prototype.restore = function(data)
+{
+    return this.initState(data[0]);
+};
+
+/**
+ * initState(data)
+ *
+ * @this {SerialPort}
+ * @param {Array} [data]
+ * @return {boolean} true if successful, false if failure
+ */
+SerialPort.prototype.initState = function(data)
+{
+    var i = 0;
+    if (data === undefined) {
+        data = [0, 0, 0];
+    }
+    this.bData = data[i++];
+    this.bCommand = data[i++];
+    this.bBaudRate = data[i++];
+    return true;
+};
+
+/**
+ * saveRegisters()
+ *
+ * @this {SerialPort}
+ * @return {Array}
+ */
+SerialPort.prototype.saveRegisters = function()
+{
+    var i = 0;
+    var data = [];
+    data[i++] = this.bData;
+    data[i++] = this.bCommand;
+    data[i++] = this.bBaudRate;
+    return data;
+};
+
+/**
+ * inData(port, addrFrom)
+ *
+ * @this {SerialPort}
+ * @param {number} port (0x0)
+ * @param {number} [addrFrom] (not defined whenever the Debugger tries to read the specified port)
+ * @return {number} simulated port value
+ */
+SerialPort.prototype.inData = function(port, addrFrom)
+{
+    var b = this.bData;
+    this.printMessageIO(port, null, addrFrom, "DATA", b);
+    return b;
+};
+
+/**
+ * inCommand(port, addrFrom)
+ *
+ * @this {SerialPort}
+ * @param {number} port (0x1)
+ * @param {number} [addrFrom] (not defined whenever the Debugger tries to read the specified port)
+ * @return {number} simulated port value
+ */
+SerialPort.prototype.inCommand = function(port, addrFrom)
+{
+    var b = this.bCommand;
+    this.printMessageIO(port, null, addrFrom, "COMMAND", b);
+    return b;
+};
+
+/**
+ * outData(port, bOut, addrFrom)
+ *
+ * @this {SerialPort}
+ * @param {number} port (0x0)
+ * @param {number} bOut
+ * @param {number} [addrFrom] (not defined whenever the Debugger tries to write the specified port)
+ */
+SerialPort.prototype.outData = function(port, bOut, addrFrom)
+{
+    this.printMessageIO(port, bOut, addrFrom, "DATA");
+    this.bData = bOut;
+};
+
+/**
+ * outCommand(port, bOut, addrFrom)
+ *
+ * @this {SerialPort}
+ * @param {number} port (0x1)
+ * @param {number} bOut
+ * @param {number} [addrFrom] (not defined whenever the Debugger tries to write the specified port)
+ */
+SerialPort.prototype.outCommand = function(port, bOut, addrFrom)
+{
+    this.printMessageIO(port, bOut, addrFrom, "COMMAND");
+    this.bCommand = bOut;
+};
+
+/**
+ * outBaudRate(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)
+{
+    this.printMessageIO(port, bOut, addrFrom, "BAUDRATE");
+    this.bBaudRate = bOut;
+};
+
+/**
+ * echoByte(b)
+ *
+ * @this {SerialPort}
+ * @param {number} b
+ * @return {boolean} true if echoed, false if not
+ */
+SerialPort.prototype.echoByte = function(b)
+{
+    if (this.controlIOBuffer) {
+        if (b == 0x0D) {
+            this.iLogicalCol = 0;
+        }
+        else if (b == 0x08) {
+            this.controlIOBuffer.value = this.controlIOBuffer.value.slice(0, -1);
+            /*
+             * TODO: Back up the correct number of columns if the character erased was a tab.
+             */
+            if (this.iLogicalCol > 0) this.iLogicalCol--;
+        }
+        else {
+            var s = String.fromCharCode(b);
+            var nChars = (b >= 0x20? 1 : 0);
+            if (b == 0x09) {
+                var tabSize = this.tabSize || 8;
+                nChars = tabSize - (this.iLogicalCol % tabSize);
+                if (this.tabSize) s = str.pad("", nChars);
+            }
+            if (this.charBOL && !this.iLogicalCol && nChars) s = String.fromCharCode(this.charBOL) + s;
+            this.controlIOBuffer.value += s;
+            this.controlIOBuffer.scrollTop = this.controlIOBuffer.scrollHeight;
+            this.iLogicalCol += nChars;
+        }
+        return true;
+    }
+    if (this.consoleOutput != null) {
+        if (b == 0x0A || this.consoleOutput.length >= 1024) {
+            this.println(this.consoleOutput);
+            this.consoleOutput = "";
+        }
+        if (b != 0x0A) {
+            this.consoleOutput += String.fromCharCode(b);
+        }
+        return true;
+    }
+    return false;
+};
+
+/*
+ * Port input notification table
+ */
+SerialPort.aPortInput = {
+    0x0: SerialPort.prototype.inData,
+    0x1: SerialPort.prototype.inCommand
+
+};
+
+/*
+ * Port output notification table
+ */
+SerialPort.aPortOutput = {
+    0x0: SerialPort.prototype.outData,
+    0x1: SerialPort.prototype.outCommand,
+    0x2: SerialPort.prototype.outBaudRate
+};
+
+/**
+ * SerialPort.init()
+ *
+ * This function operates on every HTML element of class "serial", extracting the
+ * JSON-encoded parameters for the SerialPort constructor from the element's "data-value"
+ * attribute, invoking the constructor to create a SerialPort component, and then binding
+ * any associated HTML controls to the new component.
+ */
+SerialPort.init = function()
+{
+    var aeSerial = Component.getElementsByClass(document, PC8080.APPCLASS, "serial");
+    for (var iSerial = 0; iSerial < aeSerial.length; iSerial++) {
+        var eSerial = aeSerial[iSerial];
+        var parmsSerial = Component.getComponentParms(eSerial);
+        var serial = new SerialPort(parmsSerial);
+        Component.bindComponentControls(serial, eSerial, PC8080.APPCLASS);
+    }
+};
+
+/*
+ * Initialize every SerialPort module on the page.
+ */
+web.onInit(SerialPort.init);
+
+if (NODE) module.exports = SerialPort;
diff --git a/modules/pc8080/lib/video.js b/modules/pc8080/lib/video.js
index fe8054aa6..a898ec434 100644
--- a/modules/pc8080/lib/video.js
+++ b/modules/pc8080/lib/video.js
@@ -1064,19 +1064,26 @@ Video.prototype.updateScreen = function(n)
     if (n >= 0) {
 
         if (this.rateInterrupt) {
-            if (!(n & 1)) {
-                /*
-                 * On even updates, call cpu.requestINTR(1), and also update our copy of the screen.
-                 */
-                this.cpu.requestINTR(1);
+            /*
+             * TODO: Incorporate these hard-coded interrupt vector numbers into configuration blocks.
+             */
+            if (this.rateInterrupt == 120) {
+                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);
+                    fUpdate = false;
+                }
             } 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);
-                fUpdate = false;
+                this.cpu.requestINTR(4);
             }
         }
 
diff --git a/package.json b/package.json
index fd877e4f8..25f35ca20 100644
--- a/package.json
+++ b/package.json
@@ -154,6 +154,7 @@
     "./modules/pc8080/lib/ram.js",
     "./modules/pc8080/lib/keyboard.js",
     "./modules/pc8080/lib/video.js",
+    "./modules/pc8080/lib/serialport.js",
     "./modules/pc8080/lib/debugger.js",
     "./modules/pc8080/lib/state.js",
     "./modules/pc8080/lib/computer.js",
diff --git a/versions/pc8080/1.23.3/pc8080-dbg.js b/versions/pc8080/1.23.3/pc8080-dbg.js
index 2d3da499b..69ff4f8bb 100644
--- a/versions/pc8080/1.23.3/pc8080-dbg.js
+++ b/versions/pc8080/1.23.3/pc8080-dbg.js
@@ -1,237 +1,242 @@
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+function Id(a){w.call(this,"ROM",a,Id);this.u=null;this.I=a.addr;this.C=a.size;this.J=a.writable;this.A=a.alias;this.F=a.file;this.K=ca(this.F);if(this.F){a=this.F;var b=da(this.K);"json"!=b&&"hex"!=b&&(a=pa()+"/api/v1/dump?file="+this.F+"&format=bytes&decimal=true");var c=this;oa(a,null,!0,function(a,b,f){Jd(c,a,b,f)})}}$a(Id);var Kd=[0,5];Id.prototype.Na=function(a,b,c,d){this.w=b;this.b=c;this.H=d;Ld(this)};
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+" ").replace(/ +$/,"").split(" "),a.u=Array(b.length),e=0;e<b.length;e++)a.u[e]=ba(b[e],16);Ld(a)}}
+function Ld(a){if(!kb(a))if(!a.F)E(a);else if(a.u&&a.w){a.C||(a.C=a.u.length);if(a.u.length!=a.C)lb(a,"ROM size (0x"+n(a.u.length)+") does not match specified size ("+("0x"+n(a.C))+")");else if(Md(a,a.I)){var b=[];"number"==typeof a.A?b.push(a.A):null!=a.A&&a.A.length&&(b=a.A);for(var c=0;c<b.length;c++){for(var d=a,e=b[c],f=d.w,h=d.C,g=[],k=d.I>>>f.ma;0<h&&k<f.V.length;)g.push(f.V[k++]),h-=f.Ca;f=d.w;d=d.C;h=0;for(e>>>=f.ma;0<d&&e<f.V.length;){k=g[h++];if(!k)break;f.V[e++]=k;d-=f.Ca}}delete a.u}E(a)}}
+function Md(a,b){if(vb(a.w,b,a.C,a.J?1:Wb)){var c;for(c=0;c<a.u.length;c++)Ab(a.w,b+c,a.u[c]);if(a.J&&256==b){for(c=0;c<Kd.length;c++)Ab(a.w,Kd[c],118);Jc(a.b,function(a){return function(b){if(0<=Kd.indexOf(b)){var c=!1,h=a.b,g=a.H;if(5==b)switch(c=!0,h.R){case 2:Nd(a,String.fromCharCode(h.T));break;case 9:for(var k=Pc(h),l="",p=255;p--;){var q=a.b.Y(k++);if(36==q)break;l+=String.fromCharCode(q)}Nd(a,l);break;default:c=!1}c?Dd.call(h):g&&(a.g("\nCP/M vector "+r(b)),G(h,b),g.ka());b=!0}else b=!1;return b}}(a));
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+df:109,n:110,ef:111,p:112,q:113,r:114,ff:115,t:116,hf:117,jf:118,kf:119,x:120,y:121,z:122,"{":123,"|":124,"}":125,"~":126},Rd={65:37,68:39,76:32},Sd={xa:1978.1,wb:{"1p":49,"2p":50,coin:51,left:37,right:39,fire:32}},W={xa:100,wb:{},Md:{ya:130},Ka:{ya:130,Pc:1,Oc:2,Nc:4,Mc:8,Qc:16,hc:32,dc:63,ad:64,Qd:128,INIT:0},Lc:127,B:{}};W.B[46]=3;W.B[80]=5;W.B[79]=6;W.B[89]=7;W.B[84]=8;W.B[87]=9;W.B[81]=10;W.B[39]=16;W.B[V["]"]]=20;W.B[V["["]]=21;W.B[73]=22;W.B[85]=23;W.B[82]=24;W.B[69]=25;W.B[V["1"]]=26;
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+this.O.getContext("2d"),this.ra={},this.Ia=1<<this.Ra,this.wa=Array(this.Ia+2),this.wa[0]=[0,0,0,255],this.wa[1]=[255,255,255,255],1==this.M&&(this.wa[this.Ia+0]=[255,255,0,255],this.wa[this.Ia+1]=[0,255,0,255]),2==this.M&&(this.oc=60,this.ub=!1,this.Aa=Array(this.Sa));if(this.ea=rb(a,"Keyboard")){for(var e in this.vb)this.ea.ja("led",e,this.vb[e]);this.W&&this.ea.ja(this.ld?"textarea":"canvas","kbd",this.Ha)}this.la||E(this)};
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+var U={T:1978.1,pc:{W:0,hd:1,nd:16,Bd:32,Pd:64,Nd:128,Ba:14},la:{W:1,Wb:1,lc:2,hc:4,ic:16,jc:32,kc:64,Ba:8},qc:{W:2,gd:3,Zd:4,jd:8,Jd:16,Kd:32,Ld:64,kd:128,Ba:0},Td:{W:3},Rd:{W:2,Dd:7},Vd:{W:3,ae:1,Ud:2,Md:4,vd:8,ld:16,Zc:32},Sd:{W:4},Wd:{W:5,od:1,pd:2,qd:4,rd:8,be:16}},V={T:100,ta:{W:66,fe:1,fc:2,gc:4,Hd:8,Fd:16,tb:32,sb:64,yd:128},Vb:{W:66,INIT:0},da:{Ad:{W:98},qa:{Ub:0,Tb:1,nc:2,rc:4,Zb:5,mc:6,Xd:7},Qa:16383},Yb:{W:162,INIT:0},Xb:{W:194,INIT:0}},bc={SI1978:U,VT100:V};T.prototype.R=function(){return!1};
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