Infrastructure in place for 8080 hardware interrupts (more specifically, vertical retrace interrupts)

_config.yml

@@ -116,6 +116,7 @@ pcjs:
     - /modules/pc8080/lib/cpu.js
     - /modules/pc8080/lib/cpusim.js
     - /modules/pc8080/lib/cpuops.js
+    - /modules/pc8080/lib/chipset.js
     - /modules/pc8080/lib/rom.js
     - /modules/pc8080/lib/ram.js
     - /modules/pc8080/lib/keyboard.js

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="0x2000"/>
-	<video id="video" screenWidth="224" screenHeight="256" aspect="1.33" rotate="90" addr="0x2400" width="40%" pos="left" padding="8px">
+	<video id="video" screenWidth="224" screenHeight="256" frameBuffer="0x2400" interruptRate="120" rotation="90" width="40%" pos="left" padding="8px">
 		<menu>
 			<title>224x256 Screen (Rotated)</title>
 		</menu>

docs/pcjs/examples/components.xsl

@@ -1036,10 +1036,41 @@
 				<xsl:otherwise>false</xsl:otherwise>
 			</xsl:choose>
 		</xsl:variable>
+		<xsl:variable name="aspectRatio">
+			<xsl:choose>
+				<xsl:when test="@aspect"><xsl:value-of select="@aspect"/></xsl:when>
+				<xsl:when test="@aspectRatio"><xsl:value-of select="@aspectRatio"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="frameBuffer">
+			<xsl:choose>
+				<xsl:when test="@frameBuffer"><xsl:value-of select="@frameBuffer"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="interruptRate">
+			<xsl:choose>
+				<xsl:when test="@interruptRate"><xsl:value-of select="@interruptRate"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="refreshRate">
+			<xsl:choose>
+				<xsl:when test="@refreshRate"><xsl:value-of select="@refreshRate"/></xsl:when>
+				<xsl:otherwise>60</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="rotation">
+			<xsl:choose>
+				<xsl:when test="@rotation"><xsl:value-of select="@rotation"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
 		<xsl:call-template name="component">
 			<xsl:with-param name="machine" select="$machine"/>
 			<xsl:with-param name="class">video</xsl:with-param>
-			<xsl:with-param name="parms">,model:'<xsl:value-of select="$model"/>',mode:<xsl:value-of select="$mode"/>,screenWidth:<xsl:value-of select="$screenWidth"/>,screenHeight:<xsl:value-of select="$screenHeight"/>,memory:<xsl:value-of select="$memory"/>,switches:'<xsl:value-of select="$switches"/>',scale:<xsl:value-of select="$scale"/>,charCols:<xsl:value-of select="$charCols"/>,charRows:<xsl:value-of select="$charRows"/>,fontROM:'<xsl:value-of select="$fontROM"/>',screenColor:'<xsl:value-of select="$screenColor"/>',touchScreen:'<xsl:value-of select="$touchScreen"/>',autoLock:<xsl:value-of select="$autoLock"/></xsl:with-param>
+			<xsl:with-param name="parms">,model:'<xsl:value-of select="$model"/>',mode:<xsl:value-of select="$mode"/>,screenWidth:<xsl:value-of select="$screenWidth"/>,screenHeight:<xsl:value-of select="$screenHeight"/>,memory:<xsl:value-of select="$memory"/>,switches:'<xsl:value-of select="$switches"/>',scale:<xsl:value-of select="$scale"/>,charCols:<xsl:value-of select="$charCols"/>,charRows:<xsl:value-of select="$charRows"/>,fontROM:'<xsl:value-of select="$fontROM"/>',screenColor:'<xsl:value-of select="$screenColor"/>',touchScreen:'<xsl:value-of select="$touchScreen"/>',autoLock:<xsl:value-of select="$autoLock"/>,aspectRatio:<xsl:value-of select="$aspectRatio"/>,frameBuffer:<xsl:value-of select="$frameBuffer"/>,interruptRate:<xsl:value-of select="$interruptRate"/>,refreshRate:<xsl:value-of select="$refreshRate"/>,rotation:<xsl:value-of select="$rotation"/></xsl:with-param>
 		</xsl:call-template>
 	</xsl:template>
 

modules/pc8080/lib/chipset.js

@@ -0,0 +1,486 @@
+/**
+ * @fileoverview Implements the PC8080 ChipSet component.
+ * @author <a href="mailto:Jeff@pcjs.org">Jeff Parsons</a>
+ * @version 1.0
+ * Created 2016-Apr-25
+ *
+ * Copyright © 2012-2016 Jeff Parsons <Jeff@pcjs.org>
+ *
+ * This file is part of PCjs, which is part of the JavaScript Machines Project (aka JSMachines)
+ * at <http://jsmachines.net/> and <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 Computer.COPYRIGHT).
+ *
+ * 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 the
+ * PCjs program 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 usr         = require("../../shared/lib/usrlib");
+    var web         = require("../../shared/lib/weblib");
+    var Component   = require("../../shared/lib/component");
+    var Messages    = require("./messages");
+    var State       = require("./state");
+    var CPUDef      = require("./cpudef");
+}
+
+/**
+ * ChipSet(parmsChipSet)
+ *
+ * The ChipSet component has the following component-specific (parmsChipSet) properties:
+ *
+ *      model:  eg, "SI1978" (should be a member of ChipSet.MODELS)
+ *      swDIP:  eg, "00000000", where swDIP[0] is DIP0, swDIP[1] is DIP1, etc.
+ *
+ * @constructor
+ * @extends Component
+ * @param {Object} parmsChipSet
+ */
+function ChipSet(parmsChipSet)
+{
+    Component.call(this, "ChipSet", parmsChipSet, ChipSet, Messages.CHIPSET);
+
+    var model = parmsChipSet['model'];
+
+    /*
+     * this.model is a numeric version of the 'model' string; when comparing this.model to standard IBM
+     * model numbers, you should generally compare (this.model|0) to the target value, which truncates it.
+     */
+    if (model && !ChipSet.MODELS[model]) {
+        Component.notice("Unrecognized ChipSet model: " + model);
+    }
+
+    this.model = ChipSet.MODELS[model];
+
+    this.bSwitches = this.parseDIPSwitches(parmsChipSet['swDIP']);
+
+    /*
+     * Here, I'm finally getting around to trying the Web Audio API.  Fortunately, based on what little I know about
+     * sound generation, using the API to make the same noises as the IBM PC speaker seems straightforward.
+     *
+     * To start, we create an audio context, unless the 'sound' parameter has been explicitly set to false.
+     *
+     * From:
+     *
+     *      http://developer.apple.com/library/safari/#documentation/AudioVideo/Conceptual/Using_HTML5_Audio_Video/PlayingandSynthesizingSounds/PlayingandSynthesizingSounds.html
+     *
+     * "Similar to how HTML5 canvas requires a context on which lines and curves are drawn, Web Audio requires an audio context
+     *  on which sounds are played and manipulated. This context will be the parent object of further audio objects to come....
+     *  Your audio context is typically created when your page initializes and should be long-lived. You can play multiple sounds
+     *  coming from multiple sources within the same context, so it is unnecessary to create more than one audio context per page."
+     */
+    this.fSpeaker = false;
+    if (parmsChipSet['sound']) {
+        this.classAudio = this.contextAudio = null;
+        if (window) {
+            this.classAudio = window['AudioContext'] || window['webkitAudioContext'];
+        }
+        if (this.classAudio) {
+            this.contextAudio = new this.classAudio();
+        } else {
+            if (DEBUG) this.log("AudioContext not available");
+        }
+    }
+
+    this.setReady();
+}
+
+Component.subclass(ChipSet);
+
+ChipSet.SI_1978 = {
+    MODEL:          1978.1,
+    STATUS0: {
+        PORT:       0,
+        DIP4:       0x01,               // self-test request at power up?
+        ALWAYS_SET: 0x0E,               // always set
+        FIRE:       0x10,               // fire
+        LEFT:       0x20,               // move left
+        RIGHT:      0x40,               // move right
+        PORT7:      0x80                // some connection to port 7?
+    },
+    STATUS1: {
+        PORT:       1,
+        CREDIT:     0x01,               // credit
+        P1:         0x02,               // 1P start
+        P2:         0x04,               // 2P start
+        ALWAYS_SET: 0x08,               // always set
+        P1_FIRE:    0x10,               // P1 fire (cocktail machines only?)
+        P1_LEFT:    0x20,               // P1 left (cocktail machines only?)
+        P1_RIGHT:   0x40                // P1 right (cocktail machines only?)
+    },
+    STATUS2: {
+        PORT:       2,
+        DIP3_5:     0x03,               // 00 = 3 ships, 01 = 4 ships, 10 = 5 ships, 11 = 6 ships
+        TILT:       0x04,
+        DIP6:       0x08,               // 0 = extra ship at 1500, 1 = extra ship at 1000
+        P2_FIRE:    0x10,               // P2 fire (cocktail machines only?)
+        P2_LEFT:    0x20,               // P2 left (cocktail machines only?)
+        P2_RIGHT:   0x40,               // P2 right (cocktail machines only?)
+        DIP7:       0x80                // 0 = display coin info on demo ("attract") screen
+    },
+    SHIFT_RESULT: {                     // bits 0-7 of barrel shifter result
+        PORT:       3
+    },
+    SHIFT_COUNT: {
+        PORT:       2,
+        MASK:       0x07
+    },
+    SOUND1: {
+        PORT:       3,
+        UFO:        0x01,
+        SHOT:       0x02,
+        PDEATH:     0x04,
+        IDEATH:     0x08,
+        EXPLAY:     0x10,
+        AMP_ENABLE: 0x20
+    },
+    SHIFT_DATA: {
+        PORT:       4
+    },
+    SOUND2: {
+        PORT:       5,
+        FLEET1:     0x01,
+        FLEET2:     0x02,
+        FLEET3:     0x04,
+        FLEET4:     0x08,
+        UFO_HIT:    0x10
+    }
+};
+
+/*
+ * Supported model strings
+ */
+ChipSet.MODELS = {
+    "SI1978":       ChipSet.SI_1978.MODEL
+};
+
+/**
+ * parseDIPSwitches(sBits, bDefault)
+ *
+ * @this {ChipSet}
+ * @param {string} sBits describing switch settings
+ * @param {number} [bDefault]
+ * @return {number|undefined}
+ */
+ChipSet.prototype.parseDIPSwitches = function(sBits, bDefault)
+{
+    var b = bDefault;
+    if (sBits) {
+        /*
+         * NOTE: We can't use parseInt() with a base of 2, because both bit order and bit sense are reversed.
+         */
+        b = 0;
+        var bit = 0x1;
+        for (var i = 0; i < sBits.length; i++) {
+            if (sBits.charAt(i) == "0") b |= bit;
+            bit <<= 1;
+        }
+    }
+    return b;
+};
+
+/**
+ * setBinding(sHTMLType, sBinding, control, sValue)
+ *
+ * @this {ChipSet}
+ * @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, "sw1")
+ * @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
+ */
+ChipSet.prototype.setBinding = function(sHTMLType, sBinding, control, sValue)
+{
+    return false;
+};
+
+/**
+ * initBus(cmp, bus, cpu, dbg)
+ *
+ * @this {ChipSet}
+ * @param {Computer} cmp
+ * @param {Bus} bus
+ * @param {CPUSim} cpu
+ * @param {Debugger} dbg
+ */
+ChipSet.prototype.initBus = function(cmp, bus, cpu, dbg)
+{
+    this.bus = bus;
+    this.cpu = cpu;
+    this.dbg = dbg;
+    this.cmp = cmp;
+    if (this.model == ChipSet.SI_1978.MODEL) {
+        bus.addPortInputTable(this, ChipSet.aPortInput);
+        bus.addPortOutputTable(this, ChipSet.aPortOutput);
+    }
+};
+
+/**
+ * powerUp(data, fRepower)
+ *
+ * @this {ChipSet}
+ * @param {Object|null} data
+ * @param {boolean} [fRepower]
+ * @return {boolean} true if successful, false if failure
+ */
+ChipSet.prototype.powerUp = function(data, fRepower)
+{
+    if (!fRepower) {
+        if (!data) {
+            this.reset();
+        } else {
+            if (!this.restore(data)) return false;
+        }
+    }
+    return true;
+};
+
+/**
+ * powerDown(fSave, fShutdown)
+ *
+ * @this {ChipSet}
+ * @param {boolean} [fSave]
+ * @param {boolean} [fShutdown]
+ * @return {Object|boolean} component state if fSave; otherwise, true if successful, false if failure
+ */
+ChipSet.prototype.powerDown = function(fSave, fShutdown)
+{
+    return fSave? this.save() : true;
+};
+
+/**
+ * reset()
+ *
+ * @this {ChipSet}
+ */
+ChipSet.prototype.reset = function()
+{
+    this.bStatus0 = 0;
+    this.bStatus1 = 0;
+    this.bStatus2 = 0;
+    this.bShiftData = 0;
+    this.bShiftCount = 0;
+    this.bSound1 = this.bSound2 = 0;
+};
+
+/**
+ * save()
+ *
+ * This implements save support for the ChipSet component.
+ *
+ * @this {ChipSet}
+ * @return {Object}
+ */
+ChipSet.prototype.save = function()
+{
+    var state = new State(this);
+    if (this.model == ChipSet.SI_1978.MODEL) {
+        state.set(0, [this.bStatus0, this.bStatus1, this.bStatus2, this.bShiftData, this.bShiftCount, this.bSound1, this.bSound2]);
+    }
+    return state.data();
+};
+
+/**
+ * restore(data)
+ *
+ * This implements restore support for the ChipSet component.
+ *
+ * @this {ChipSet}
+ * @param {Object} data
+ * @return {boolean} true if successful, false if failure
+ */
+ChipSet.prototype.restore = function(data)
+{
+    var a, i;
+    a = data[0];
+    if (this.model == ChipSet.SI_1978.MODEL) {
+        this.bStatus0 = a[0];
+        this.bStatus1 = a[1];
+        this.bStatus2 = a[2];
+        this.bShiftData = a[3];
+        this.bShiftCount = a[4];
+        this.bSound1 = a[5];
+        this.bSound2 = a[6];
+    }
+    return true;
+};
+
+/**
+ * inSIStatus0(port, addrFrom)
+ *
+ * @this {ChipSet}
+ * @param {number} port (0x00)
+ * @param {number} [addrFrom] (not defined if the Debugger is trying to read the specified port)
+ * @return {number} simulated port value
+ */
+ChipSet.prototype.inSIStatus0 = function(port, addrFrom)
+{
+    var b = this.bStatus0;
+    this.printMessageIO(port, null, addrFrom, "STATUS0", b, true);
+    return b;
+};
+
+/**
+ * inSIStatus1(port, addrFrom)
+ *
+ * @this {ChipSet}
+ * @param {number} port (0x01)
+ * @param {number} [addrFrom] (not defined if the Debugger is trying to read the specified port)
+ * @return {number} simulated port value
+ */
+ChipSet.prototype.inSIStatus1 = function(port, addrFrom)
+{
+    var b = this.bStatus1;
+    this.printMessageIO(port, null, addrFrom, "STATUS1", b, true);
+    return b;
+};
+
+/**
+ * inSIStatus2(port, addrFrom)
+ *
+ * @this {ChipSet}
+ * @param {number} port (0x02)
+ * @param {number} [addrFrom] (not defined if the Debugger is trying to read the specified port)
+ * @return {number} simulated port value
+ */
+ChipSet.prototype.inSIStatus2 = function(port, addrFrom)
+{
+    var b = this.bStatus2;
+    this.printMessageIO(port, null, addrFrom, "STATUS2", b, true);
+    return b;
+};
+
+/**
+ * inSIShiftResult(port, addrFrom)
+ *
+ * @this {ChipSet}
+ * @param {number} port (0x03)
+ * @param {number} [addrFrom] (not defined if the Debugger is trying to read the specified port)
+ * @return {number} simulated port value
+ */
+ChipSet.prototype.inSIShiftResult = function(port, addrFrom)
+{
+    var b = ((this.bShiftData << this.bShiftCount) >> 8) & 0xff;
+    this.printMessageIO(port, null, addrFrom, "SHIFT.RESULT", b, true);
+    return b;
+};
+
+/**
+ * outSIShiftCount(port, b, addrFrom)
+ *
+ * @this {ChipSet}
+ * @param {number} port (0x02)
+ * @param {number} b
+ * @param {number} [addrFrom] (not defined if the Debugger is trying to write the specified port)
+ */
+ChipSet.prototype.outSIShiftCount = function(port, b, addrFrom)
+{
+    this.printMessageIO(port, b, addrFrom, "SHIFT.COUNT", null, true);
+    this.bShiftCount = b;
+};
+
+/**
+ * outSISound1(port, b, addrFrom)
+ *
+ * @this {ChipSet}
+ * @param {number} port (0x03)
+ * @param {number} b
+ * @param {number} [addrFrom] (not defined if the Debugger is trying to write the specified port)
+ */
+ChipSet.prototype.outSISound1 = function(port, b, addrFrom)
+{
+    this.printMessageIO(port, b, addrFrom, "SOUND1", null, true);
+    this.bSound1 = b;
+};
+
+/**
+ * outSIShiftData(port, b, addrFrom)
+ *
+ * @this {ChipSet}
+ * @param {number} port (0x04)
+ * @param {number} b
+ * @param {number} [addrFrom] (not defined if the Debugger is trying to write the specified port)
+ */
+ChipSet.prototype.outSIShiftData = function(port, b, addrFrom)
+{
+    this.printMessageIO(port, b, addrFrom, "SHIFT.DATA", null, true);
+    this.bShiftData = b;
+};
+
+/**
+ * outSISound2(port, b, addrFrom)
+ *
+ * @this {ChipSet}
+ * @param {number} port (0x05)
+ * @param {number} b
+ * @param {number} [addrFrom] (not defined if the Debugger is trying to write the specified port)
+ */
+ChipSet.prototype.outSISound2 = function(port, b, addrFrom)
+{
+    this.printMessageIO(port, b, addrFrom, "SOUND2", null, true);
+    this.bSound2 = b;
+};
+
+/*
+ * Port input notification tables
+ */
+ChipSet.aPortInput = {
+    0x00: ChipSet.prototype.inSIStatus0,
+    0x01: ChipSet.prototype.inSIStatus1,
+    0x02: ChipSet.prototype.inSIStatus2,
+    0x03: ChipSet.prototype.inSIShiftResult
+};
+
+/*
+ * Port output notification tables
+ */
+ChipSet.aPortOutput = {
+    0x02: ChipSet.prototype.outSIShiftCount,
+    0x03: ChipSet.prototype.outSISound1,
+    0x04: ChipSet.prototype.outSIShiftData,
+    0x05: ChipSet.prototype.outSISound2
+};
+
+/**
+ * ChipSet.init()
+ *
+ * This function operates on every HTML element of class "chipset", extracting the
+ * JSON-encoded parameters for the ChipSet constructor from the element's "data-value"
+ * attribute, invoking the constructor to create a ChipSet component, and then binding
+ * any associated HTML controls to the new component.
+ */
+ChipSet.init = function()
+{
+    var aeChipSet = Component.getElementsByClass(document, PCJSCLASS, "chipset");
+    for (var iChip = 0; iChip < aeChipSet.length; iChip++) {
+        var eChipSet = aeChipSet[iChip];
+        var parmsChipSet = Component.getComponentParms(eChipSet);
+        var chipset = new ChipSet(parmsChipSet);
+        Component.bindComponentControls(chipset, eChipSet, PCJSCLASS);
+    }
+};
+
+/*
+ * Initialize every ChipSet module on the page.
+ */
+web.onInit(ChipSet.init);
+
+if (NODE) module.exports = ChipSet;

modules/pc8080/lib/computer.js

@@ -1479,22 +1479,18 @@ Computer.prototype.updateStatus = function(fForce)
 };
 
 /**
- * updateVideo(fForce)
+ * updateVideo(n)
  *
- * Any high-frequency updates should be performed here.  Avoid DOM updates, since updateVideo() can be called up to
+ * Any high-frequency updates should be performed here (avoid updating DOM elements).
- * 60 times per second (see VIDEO_UPDATES_PER_SECOND).
  *
  * @this {Computer}
- * @param {boolean} [fForce] (true to force a video update)
+ * @param {number} n (where 0 <= n < VIDEO_UPDATES_PER_SECOND for a normal update, or -1 for a forced update)
  */
-Computer.prototype.updateVideo = function(fForce)
+Computer.prototype.updateVideo = function(n)
 {
-    /*
     for (var i = 0; i < this.aVideo.length; i++) {
-        this.aVideo[i].updateScreen(fForce);
+        this.aVideo[i].updateScreen(n);
     }
-    if (this.panel) this.panel.updateAnimation();
-    */
 };
 
 /**

modules/pc8080/lib/cpu.js

@@ -82,6 +82,7 @@ function CPU(parmsCPU, nCyclesDefault)
 
     this.aCounts = {};
     this.aCounts.nCyclesPerSecond = nCycles;
+    this.aCounts.nVideoUpdates = 0;
 
     /*
      * nCyclesMultiplier replaces the old "speed" variable (0, 1, 2) and eliminates the need for
@@ -148,7 +149,7 @@ Component.subclass(CPU);
  *      this.aCounts.nCyclesNextStatusUpdate <= this.aCounts.nCyclesPerStatusUpdate
  */
 CPU.YIELDS_PER_SECOND         = 30;
-CPU.VIDEO_UPDATES_PER_SECOND  = 60;     // WARNING: if you change this, beware of side-effects in the Video component
+CPU.VIDEO_UPDATES_PER_SECOND  = 60;
 CPU.STATUS_UPDATES_PER_SECOND = 2;
 
 CPU.BUTTONS = ["power", "reset"];
@@ -173,13 +174,14 @@ CPU.prototype.initBus = function(cmp, bus, cpu, dbg)
         if (control) this.cmp.setBinding(null, CPU.BUTTONS[i], control);
     }
 
-    this.fpu = cmp.getMachineComponent("FPU");
+    /*
+     * We need to know the refresh rate (and corresponding interrupt rate, if any) of the Video component.
+     */
+    var video = cmp.getMachineComponent("Video");
+    this.refreshRate = video && video.getRefreshRate() || CPU.VIDEO_UPDATES_PER_SECOND;
 
     /*
-     * Attach the ChipSet component to the CPU so that it can obtain the IDT vector number
+     * Attach the ChipSet component to the CPU so that it can be notified whenever the CPU stops and starts.
-     * of pending hardware interrupts in response to the ChipSet's updateINTR() notifications.
-     *
-     * We must also call chipset.updateAllTimers() periodically; stepCPU() takes care of that.
      */
     this.chipset = cmp.getMachineComponent("ChipSet");
 
@@ -197,12 +199,11 @@ CPU.prototype.initBus = function(cmp, bus, cpu, dbg)
 /**
  * reset()
  *
- * This is a placeholder for reset (overridden by the CPUSim component).
- *
  * @this {CPU}
  */
 CPU.prototype.reset = function()
 {
+     this.aCounts.nVideoUpdates = 0;
 };
 
 /**
@@ -550,7 +551,7 @@ CPU.prototype.setBurstCycles = function(nCycles)
          * costs are being properly assessed, then we need to update nSnapCycles as well.
          *
          * TODO: If the delta is negative, we could simply ignore the request, but we must first carefully
-         * consider the impact on the ChipSet timers.
+         * consider the impact on the ChipSet timers, if any.
          */
         // if (DEBUG) this.nSnapCycles -= nDelta;
         this.nStepCycles -= nDelta;
@@ -606,7 +607,7 @@ CPU.prototype.calcCycles = function(fRecalc)
      * Calculate the most cycles we're allowed to execute in a single "burst"
      */
     var nMostUpdatesPerSecond = CPU.YIELDS_PER_SECOND;
-    if (nMostUpdatesPerSecond < CPU.VIDEO_UPDATES_PER_SECOND) nMostUpdatesPerSecond = CPU.VIDEO_UPDATES_PER_SECOND;
+    if (nMostUpdatesPerSecond < this.refreshRate) nMostUpdatesPerSecond = this.refreshRate;
     if (nMostUpdatesPerSecond < CPU.STATUS_UPDATES_PER_SECOND) nMostUpdatesPerSecond = CPU.STATUS_UPDATES_PER_SECOND;
 
     /*
@@ -622,7 +623,7 @@ CPU.prototype.calcCycles = function(fRecalc)
     this.aCounts.msPerYield = Math.round(1000 / CPU.YIELDS_PER_SECOND);
     this.aCounts.nCyclesPerBurst = Math.floor(this.aCounts.nCyclesPerSecond / nMostUpdatesPerSecond * vMultiplier);
     this.aCounts.nCyclesPerYield = Math.floor(this.aCounts.nCyclesPerSecond / CPU.YIELDS_PER_SECOND * vMultiplier);
-    this.aCounts.nCyclesPerVideoUpdate = Math.floor(this.aCounts.nCyclesPerSecond / CPU.VIDEO_UPDATES_PER_SECOND * vMultiplier);
+    this.aCounts.nCyclesPerVideoUpdate = Math.floor(this.aCounts.nCyclesPerSecond / this.refreshRate * vMultiplier);
     this.aCounts.nCyclesPerStatusUpdate = Math.floor(this.aCounts.nCyclesPerSecond / CPU.STATUS_UPDATES_PER_SECOND * vMultiplier);
 
     /*
@@ -807,7 +808,6 @@ CPU.prototype.calcSpeed = function(nCycles, msElapsed)
         this.aCounts.mhz = Math.round(nCycles / (msElapsed * 10)) / 100;
         if (msElapsed >= 86400000) {
             this.nTotalCycles = 0;
-            if (this.chipset) this.chipset.updateAllTimers(true);
             this.setSpeed();        // reset all counters once per day so that we never have to worry about overflow
         }
     }
@@ -965,12 +965,6 @@ CPU.prototype.runCPU = function(fUpdateFocus)
         do {
             var nCyclesPerBurst = (this.flags.fChecksum? 1 : this.aCounts.nCyclesPerBurst);
 
-            if (this.chipset) {
-                this.chipset.updateAllTimers();
-                nCyclesPerBurst = this.chipset.getTimerCycleLimit(0, nCyclesPerBurst);
-                nCyclesPerBurst = this.chipset.getRTCCycleLimit(nCyclesPerBurst);
-            }
-
             /*
              * nCyclesPerBurst is how many cycles we WANT to run on each iteration of stepCPU(), but it may run
              * significantly less (or slightly more, since we can't execute partial instructions).
@@ -1005,7 +999,8 @@ CPU.prototype.runCPU = function(fUpdateFocus)
             this.aCounts.nCyclesNextVideoUpdate -= nCycles;
             if (this.aCounts.nCyclesNextVideoUpdate <= 0) {
                 this.aCounts.nCyclesNextVideoUpdate += this.aCounts.nCyclesPerVideoUpdate;
-                if (this.cmp) this.cmp.updateVideo();
+                if (this.cmp) this.cmp.updateVideo(this.aCounts.nVideoUpdates++);
+                if (this.aCounts.nVideoUpdates > this.refreshRate) this.aCounts.nVideoUpdates = 0;
             }
 
             this.aCounts.nCyclesNextStatusUpdate -= nCycles;
@@ -1117,7 +1112,7 @@ CPU.prototype.stopCPU = function(fComplete)
 CPU.prototype.updateCPU = function(fForce)
 {
     if (this.cmp) {
-        this.cmp.updateVideo(fForce);
+        this.cmp.updateVideo(-1);
         this.cmp.updateStatus(fForce);
     }
 };

modules/pc8080/lib/cpudef.js

@@ -91,28 +91,22 @@ var CPUDef = {
         0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
         1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
     ],
-    /*
-     * Bit values for opFlags, which are all reset to zero prior to each instruction
-     */
-    OPFLAG: {
-        NOREAD:     0x0001,     // disable memory reads for the remainder of the current instruction
-        NOWRITE:    0x0002,     // disable memory writes for the remainder of the current instruction
-        NOINTR:     0x0004      // a segreg has been set, or a prefix, or an STI (delay INTR acknowledgement)
-    },
     /*
      * Bit values for intFlags
      */
     INTFLAG: {
         NONE:       0x00,
-        INTR:       0x01,       // h/w interrupt requested
+        INTL:       0x07,       // last interrupt level requested
-        HALT:       0x04        // halt (HLT) requested
+        INTR:       0x08,       // set if interrupt has been requested
+        HALT:       0x10        // halt requested; see the HLT opcode
     },
     /*
      * Opcode definitions
      */
     OPCODE: {
         ACI:    0xCE,           // PS.ALL
-        CALL:   0xCD
+        CALL:   0xCD,
+        RST0:   0xC7
         // to be continued....
     }
 };

modules/pc8080/lib/cpuops.js

@@ -2747,7 +2747,7 @@ CPUDef.opCP = function()
  */
 CPUDef.opPUPSW = function()
 {
-    this.pushWord(this.getPS() | (this.regA << 8));
+    this.pushWord((this.getPS() & 0xff) | (this.regA << 8));
     this.nStepCycles -= 11;
 };
 

modules/pc8080/lib/cpusim.js

@@ -226,6 +226,7 @@ CPUSim.prototype.reset = function()
     this.resetRegs();
     this.resetCycles();
     this.clearError();      // clear any fatal error/exception that setError() may have flagged
+    this.parent.reset.call(this);
 };
 
 /**
@@ -255,8 +256,6 @@ CPUSim.prototype.resetRegs = function()
      * intFlags contains some internal states we use to indicate whether a hardware interrupt (INTFLAG.INTR) or
      * Trap software interrupt (INTR.TRAP) has been requested, as well as when we're in a "HLT" state (INTFLAG.HALT)
      * that requires us to wait for a hardware interrupt (INTFLAG.INTR) before continuing execution.
-     *
-     * intFlags must be cleared only by checkINTR(), whereas opFlags must be cleared prior to every CPU operation.
      */
     this.intFlags = CPUDef.INTFLAG.NONE;
 };
@@ -286,7 +285,7 @@ CPUSim.prototype.save = function()
 {
     var state = new State(this);
     state.set(0, [this.regA, this.regB, this.regC, this.regD, this.regE, this.regH, this.regL, this.getSP(), this.getPC(), this.getPS()]);
-    state.set(1, [this.opFlags, this.intFlags, this.nTotalCycles, this.getSpeed()]);
+    state.set(1, [this.intFlags, this.nTotalCycles, this.getSpeed()]);
     state.set(2, this.bus.saveMemory());
     return state.data();
 };
@@ -314,9 +313,8 @@ CPUSim.prototype.restore = function(data)
     this.setPC(a[8]);
     this.setPS(a[9]);
     a = data[1];
-    this.opFlags = a[0];
+    this.intFlags = a[0];
-    this.intFlags = a[1];
+    this.nTotalCycles = a[1];
-    this.nTotalCycles = a[2];
     this.setSpeed(a[3]);
     return this.bus.restoreMemory(data[2]);
 };
@@ -965,39 +963,52 @@ CPUSim.prototype.pushWord = function(w)
 /**
  * checkINTR()
  *
- * This must only be called when intFlags (containing the simulated INTFLAG.INTR signal) is known to be set.
- * Note that it's perfectly possible that between the time updateINTR(true) was called and we request the
- * interrupt vector number below, the interrupt could have been cleared or masked, in which case getIRRVector()
- * will return -1 and we'll simply clear INTFLAG.INTR.
- *
  * @this {CPUSim}
- * @return {boolean} true if h/w interrupt (or trap) has just been acknowledged, false if not
+ * @return {boolean} true if h/w interrupt has just been acknowledged, false if not
  */
 CPUSim.prototype.checkINTR = function()
 {
+    if ((this.intFlags & CPUDef.INTFLAG.INTR) && this.getIF()) {
+        var bRST = CPUDef.OPCODE.RST0 | ((this.intFlags & CPUDef.INTFLAG.INTL) << 3);
+        this.clearINTR();
+        this.clearIF();
+        this.aOps[bRST].call(this);
+        return true;
+    }
     return false;
 };
 
 /**
- * updateINTR(fRaise)
+ * clearINTR()
- *
- * This is called by the ChipSet component whenever a h/w interrupt needs to be simulated.
- * This is how the PIC component simulates raising the INTFLAG.INTR signal.  We will honor the request
- * only if we have a reference back to the ChipSet component.  The CPU will then "respond" by calling
- * checkINTR() and request the corresponding interrupt vector from the ChipSet.
  *
  * @this {CPUSim}
- * @param {boolean} fRaise is true to raise INTFLAG.INTR, false to lower
  */
-CPUSim.prototype.updateINTR = function(fRaise)
+CPUSim.prototype.clearINTR = function()
 {
-    if (this.chipset) {
+    this.intFlags &= ~(CPUDef.INTFLAG.INTL | CPUDef.INTFLAG.INTR);
-        if (fRaise) {
+};
-            this.intFlags |= CPUDef.INTFLAG.INTR;
+
-        } else {
+/**
-            this.intFlags &= ~CPUDef.INTFLAG.INTR;
+ * requestINTR(nLevel)
-        }
+ *
-    }
+ * This is called by any component that wants to request a h/w interrupt.
+ *
+ * NOTE: We allow INTR to be set regardless of the current state of interrupt flag (IF), on the theory
+ * that if/when the CPU briefly turns interrupts off, it shouldn't lose the last h/w interrupt requested.
+ * So instead of ignoring INTR here, checkINTR() ignores INTR as long as the interrupt flag (IF) is clear.
+ *
+ * The downside is that, as long as the CPU has interrupts disabled, an active INTR state will slow stepCPU()
+ * down slightly.  We could avoid that by introducing a two-stage interrupt tracking system, where a separate
+ * variable keeps track of the last interrupt requested whenever the interrupt flag (IF) is clear, and when
+ * setIF() finally occurs, that interrupt is propagated to intFlags.  But for now, we're going to assume that
+ * scenario is rare.
+ *
+ * @this {CPUSim}
+ * @param {number} nLevel (0-7)
+ */
+CPUSim.prototype.requestINTR = function(nLevel)
+{
+    this.intFlags = (this.intFlags & ~CPUDef.INTFLAG.INTL) | nLevel | CPUDef.INTFLAG.INTR;
 };
 
 /**
@@ -1110,27 +1121,6 @@ CPUSim.prototype.stepCPU = function(nMinCycles)
      */
     this.nBurstCycles = this.nStepCycles = nMinCycles;
 
-    /*
-     * NOTE: Even though runCPU() calls updateAllTimers(), we need an additional call here if we're being
-     * called from the Debugger, so that any single-stepping will update the timers as well.
-     */
-    if (this.chipset && !nMinCycles) this.chipset.updateAllTimers();
-
-    /*
-     * Let's also suppress h/w interrupts whenever the Debugger is single-stepping an instruction; I'm loathe
-     * to allow Debugger interactions to affect the behavior of the virtual machine in ANY way, but I'm making
-     * this small concession to avoid the occasional and sometimes unexpected Debugger command that ends up
-     * stepping into a hardware interrupt service routine (ISR).
-     *
-     * Note that this is similar to the problem discussed in checkINTR() regarding the priority of external h/w
-     * interrupts vs. Trap interrupts, but they require different solutions, because our Debugger operates
-     * independently of the CPU.
-     *
-     * One exception I make here is when you've asked the Debugger to display PIC messages, the idea being that
-     * if you're watching the PIC that closely, then you want to hardware interrupts to occur regardless.
-     */
-    if (!nMinCycles) this.opFlags |= CPUDef.OPFLAG.NOINTR;
-
     do {
         if (this.intFlags) {
             if (this.checkINTR()) {
@@ -1138,12 +1128,11 @@ CPUSim.prototype.stepCPU = function(nMinCycles)
                     this.assert(DEBUGGER);  // nMinCycles of zero should be generated ONLY by the Debugger
                     if (DEBUGGER) {
                         this.println("interrupt dispatched");
-                        this.opFlags = 0;
                         break;
                     }
                 }
             }
-            if (this.intFlags & CPUDef.INTFLAG.HALT) {
+            else if (this.intFlags & CPUDef.INTFLAG.HALT) {
                 /*
                  * As discussed in opHLT(), the CPU is never REALLY halted by a HLT instruction; instead,
                  * opHLT() sets CPUDef.INTFLAG.HALT, signalling to us that we're free to end the current burst
@@ -1160,7 +1149,6 @@ CPUSim.prototype.stepCPU = function(nMinCycles)
                  * number of cycles during which we did not actually execute any instructions).
                  */
                 this.nStepCycles = 0;
-                this.opFlags = 0;
                 break;
             }
         }
@@ -1173,8 +1161,6 @@ CPUSim.prototype.stepCPU = function(nMinCycles)
             nDebugState = 1;
         }
 
-        this.opFlags = 0;
-
         this.aOps[this.getPCByte()].call(this);
 
     } while (this.nStepCycles > 0);

modules/pc8080/lib/debugger.js

@@ -359,7 +359,7 @@ if (DEBUGGER) {
     Debugger.TYPE_E  = (Debugger.REG_E  << 8 | Debugger.TYPE_REG | Debugger.TYPE_BYTE);
     Debugger.TYPE_H  = (Debugger.REG_H  << 8 | Debugger.TYPE_REG | Debugger.TYPE_BYTE);
     Debugger.TYPE_L  = (Debugger.REG_L  << 8 | Debugger.TYPE_REG | Debugger.TYPE_BYTE);
-    Debugger.TYPE_M  = (Debugger.REG_M  << 8 | Debugger.TYPE_REG | Debugger.TYPE_BYTE);
+    Debugger.TYPE_M  = (Debugger.REG_M  << 8 | Debugger.TYPE_REG | Debugger.TYPE_BYTE | Debugger.TYPE_MEM);
     Debugger.TYPE_BC = (Debugger.REG_BC << 8 | Debugger.TYPE_REG | Debugger.TYPE_WORD);
     Debugger.TYPE_DE = (Debugger.REG_DE << 8 | Debugger.TYPE_REG | Debugger.TYPE_WORD);
     Debugger.TYPE_HL = (Debugger.REG_HL << 8 | Debugger.TYPE_REG | Debugger.TYPE_WORD);
@@ -404,7 +404,7 @@ if (DEBUGGER) {
     /* 0x06 */  [Debugger.INS.MVI,   Debugger.TYPE_B,    Debugger.TYPE_IMM],
     /* 0x07 */  [Debugger.INS.RLC],
     /* 0x08 */  [Debugger.INS.NOP,   Debugger.TYPE_UNDOC],
-    /* 0x09 */  [Debugger.INS.DAD,   Debugger.TYPE_BC  | Debugger.TYPE_IN],  // REG_HL is the implied (unlisted) destination
+    /* 0x09 */  [Debugger.INS.DAD,   Debugger.TYPE_HL,   Debugger.TYPE_BC  | Debugger.TYPE_IN],     // let's be more explicit about the operands
     /* 0x0A */  [Debugger.INS.LDAX,  Debugger.TYPE_BC  | Debugger.TYPE_MEM],
     /* 0x0B */  [Debugger.INS.DCX,   Debugger.TYPE_BC],
     /* 0x0C */  [Debugger.INS.INR,   Debugger.TYPE_C],
@@ -420,7 +420,7 @@ if (DEBUGGER) {
     /* 0x16 */  [Debugger.INS.MVI,   Debugger.TYPE_D,    Debugger.TYPE_IMM],
     /* 0x17 */  [Debugger.INS.RAL],
     /* 0x18 */  [Debugger.INS.NOP,   Debugger.TYPE_UNDOC],
-    /* 0x19 */  [Debugger.INS.DAD,   Debugger.TYPE_DE  | Debugger.TYPE_IN],  // REG_HL is the implied (unlisted) destination
+    /* 0x19 */  [Debugger.INS.DAD,   Debugger.TYPE_HL,   Debugger.TYPE_DE  | Debugger.TYPE_IN],     // let's be more explicit about the operands
     /* 0x1A */  [Debugger.INS.LDAX,  Debugger.TYPE_DE  | Debugger.TYPE_MEM],
     /* 0x1B */  [Debugger.INS.DCX,   Debugger.TYPE_DE],
     /* 0x1C */  [Debugger.INS.INR,   Debugger.TYPE_E],
@@ -436,7 +436,7 @@ if (DEBUGGER) {
     /* 0x26 */  [Debugger.INS.MVI,   Debugger.TYPE_H,    Debugger.TYPE_IMM],
     /* 0x27 */  [Debugger.INS.DAA],
     /* 0x28 */  [Debugger.INS.NOP,   Debugger.TYPE_UNDOC],
-    /* 0x29 */  [Debugger.INS.DAD,   Debugger.TYPE_HL  | Debugger.TYPE_IN],  // REG_HL is the implied (unlisted) destination
+    /* 0x29 */  [Debugger.INS.DAD,   Debugger.TYPE_HL,   Debugger.TYPE_HL  | Debugger.TYPE_IN],     // let's be more explicit about the operands
     /* 0x2A */  [Debugger.INS.LHLD,  Debugger.TYPE_IMM | Debugger.TYPE_WORD | Debugger.TYPE_MEM],
     /* 0x2B */  [Debugger.INS.DCX,   Debugger.TYPE_HL],
     /* 0x2C */  [Debugger.INS.INR,   Debugger.TYPE_L],
@@ -445,15 +445,15 @@ if (DEBUGGER) {
     /* 0x2F */  [Debugger.INS.CMA],
     /* 0x30 */  [Debugger.INS.NOP,   Debugger.TYPE_UNDOC],
     /* 0x31 */  [Debugger.INS.LXI,   Debugger.TYPE_SP,   Debugger.TYPE_IMM],
-    /* 0x32 */  [Debugger.INS.STA,   Debugger.TYPE_IMM | Debugger.TYPE_BYTE | Debugger.TYPE_MEM],
+    /* 0x32 */  [Debugger.INS.STA,   Debugger.TYPE_IMM | Debugger.TYPE_WORD | Debugger.TYPE_MEM],
     /* 0x33 */  [Debugger.INS.INX,   Debugger.TYPE_SP],
     /* 0x34 */  [Debugger.INS.INR,   Debugger.TYPE_M],
     /* 0x35 */  [Debugger.INS.DCR,   Debugger.TYPE_M],
     /* 0x36 */  [Debugger.INS.MVI,   Debugger.TYPE_M,    Debugger.TYPE_IMM],
     /* 0x37 */  [Debugger.INS.STC],
     /* 0x38 */  [Debugger.INS.NOP,   Debugger.TYPE_UNDOC],
-    /* 0x39 */  [Debugger.INS.DAD,   Debugger.TYPE_SP  | Debugger.TYPE_IN],  // REG_HL is the implied (unlisted) destination
+    /* 0x39 */  [Debugger.INS.DAD,   Debugger.TYPE_HL,   Debugger.TYPE_SP  | Debugger.TYPE_IN],     // let's be more explicit about the operands
-    /* 0x3A */  [Debugger.INS.LDA,   Debugger.TYPE_IMM | Debugger.TYPE_BYTE | Debugger.TYPE_MEM],
+    /* 0x3A */  [Debugger.INS.LDA,   Debugger.TYPE_IMM | Debugger.TYPE_WORD | Debugger.TYPE_MEM],
     /* 0x3B */  [Debugger.INS.DCX,   Debugger.TYPE_SP],
     /* 0x3C */  [Debugger.INS.INR,   Debugger.TYPE_A],
     /* 0x3D */  [Debugger.INS.DCR,   Debugger.TYPE_A],
@@ -622,15 +622,15 @@ if (DEBUGGER) {
     /* 0xE0 */  [Debugger.INS.RPO],
     /* 0xE1 */  [Debugger.INS.POP,   Debugger.TYPE_HL],
     /* 0xE2 */  [Debugger.INS.JPO,   Debugger.TYPE_IMM | Debugger.TYPE_WORD],
-    /* 0xE3 */  [Debugger.INS.XTHL],
+    /* 0xE3 */  [Debugger.INS.XTHL,  Debugger.TYPE_SP  | Debugger.TYPE_MEM,  Debugger.TYPE_HL],     // let's be more explicit about the operands
     /* 0xE4 */  [Debugger.INS.CPO,   Debugger.TYPE_IMM | Debugger.TYPE_WORD],
     /* 0xE5 */  [Debugger.INS.PUSH,  Debugger.TYPE_HL],
     /* 0xE6 */  [Debugger.INS.ANI,   Debugger.TYPE_IMM | Debugger.TYPE_BYTE],
     /* 0xE7 */  [Debugger.INS.RST],
     /* 0xE8 */  [Debugger.INS.RPE],
-    /* 0xE9 */  [Debugger.INS.PCHL],
+    /* 0xE9 */  [Debugger.INS.PCHL,  Debugger.TYPE_PC,   Debugger.TYPE_HL],                         // let's be more explicit about the operands
     /* 0xEA */  [Debugger.INS.JPE,   Debugger.TYPE_IMM | Debugger.TYPE_WORD],
-    /* 0xEB */  [Debugger.INS.XCHG],
+    /* 0xEB */  [Debugger.INS.XCHG,  Debugger.TYPE_HL,   Debugger.TYPE_DE],                         // let's be more explicit about the operands
     /* 0xEC */  [Debugger.INS.CPE,   Debugger.TYPE_IMM | Debugger.TYPE_WORD],
     /* 0xED */  [Debugger.INS.CALL,  Debugger.TYPE_IMM | Debugger.TYPE_WORD | Debugger.TYPE_UNDOC],
     /* 0xEE */  [Debugger.INS.XRI,   Debugger.TYPE_IMM | Debugger.TYPE_BYTE],
@@ -644,7 +644,7 @@ if (DEBUGGER) {
     /* 0xF6 */  [Debugger.INS.ORI,   Debugger.TYPE_IMM | Debugger.TYPE_BYTE],
     /* 0xF7 */  [Debugger.INS.RST],
     /* 0xF8 */  [Debugger.INS.RM],
-    /* 0xF9 */  [Debugger.INS.SPHL],
+    /* 0xF9 */  [Debugger.INS.SPHL,  Debugger.TYPE_SP,   Debugger.TYPE_HL],                         // let's be more explicit about the operands
     /* 0xFA */  [Debugger.INS.JM,    Debugger.TYPE_IMM | Debugger.TYPE_WORD],
     /* 0xFB */  [Debugger.INS.EI],
     /* 0xFC */  [Debugger.INS.CM,    Debugger.TYPE_IMM | Debugger.TYPE_WORD],
@@ -672,7 +672,7 @@ if (DEBUGGER) {
         "bus":      Messages.BUS,
         "mem":      Messages.MEM,
         "port":     Messages.PORT,
-        "timer":    Messages.TIMER,
+        "chipset":  Messages.CHIPSET,
         "keyboard": Messages.KEYBOARD,  // "kbd" is also allowed as shorthand for "keyboard"; see doMessages()
         "key":      Messages.KEYS,      // using "key" instead of "keys", since the latter is a method on JavasScript objects
         "video":    Messages.VIDEO,
@@ -1384,6 +1384,7 @@ if (DEBUGGER) {
             case Debugger.REG_E:
             case Debugger.REG_H:
             case Debugger.REG_L:
+            case Debugger.REG_M:
             case Debugger.REG_F:
                 cch = 2;
                 break;
@@ -1417,7 +1418,7 @@ if (DEBUGGER) {
                 n = cpu.regA;
                 break;
             case Debugger.REG_F:
-                n = cpu.getPS() & 0xff;
+                n = cpu.getPS();
                 break;
             case Debugger.REG_B:
                 n = cpu.regB;
@@ -1426,7 +1427,7 @@ if (DEBUGGER) {
                 n = cpu.regC;
                 break;
             case Debugger.REG_BC:
-                n = (cpu.regB << 8) | cpu.regC;
+                n = cpu.getBC();
                 break;
             case Debugger.REG_D:
                 n = cpu.regD;
@@ -1435,7 +1436,7 @@ if (DEBUGGER) {
                 n = cpu.regE;
                 break;
             case Debugger.REG_DE:
-                n = (cpu.regD << 8) | cpu.regE;
+                n = cpu.getDE();
                 break;
             case Debugger.REG_H:
                 n = cpu.regH;
@@ -1444,7 +1445,10 @@ if (DEBUGGER) {
                 n = cpu.regL;
                 break;
             case Debugger.REG_HL:
-                n = (cpu.regH << 8) | cpu.regL;
+                n = cpu.getHL();
+                break;
+            case Debugger.REG_M:
+                n = cpu.getByte(cpu.getHL());
                 break;
             case Debugger.REG_PS:
                 n = (cpu.regA << 8) | (cpu.getPS() & 0xff);
@@ -2430,31 +2434,38 @@ if (DEBUGGER) {
         var iIns = aOpDesc[0];
 
         var sOperands = "";
-        var typeSizeDefault = null;
         var sOpcode = asOpcodes[iIns];
         var cOperands = aOpDesc.length - 1;
+        var typeSizeDefault = Debugger.TYPE_NONE, type;
 
         for (var iOperand = 1; iOperand <= cOperands; iOperand++) {
 
             var disp, off, cch;
             var sOperand = "";
-            var type = aOpDesc[iOperand];
+
+            type = aOpDesc[iOperand];
             if (type === undefined) continue;
 
             var typeSize = type & Debugger.TYPE_SIZE;
-            if (typeSize == Debugger.TYPE_NONE) {
+            if (!typeSize) {
-                if (typeSizeDefault == null) continue;
+                type |= typeSizeDefault;
-                typeSize = typeSizeDefault;
+            } else {
+                typeSizeDefault = typeSize;
+            }
+
+            var typeOther = type & Debugger.TYPE_OTHER;
+            if (!typeOther) {
+                type |= (iOperand == 1? Debugger.TYPE_OUT : Debugger.TYPE_IN);
             }
-            typeSizeDefault = typeSize;
 
             var typeMode = type & Debugger.TYPE_MODE;
-            if (typeMode == Debugger.TYPE_IMM) {
+            if (typeMode & Debugger.TYPE_IMM) {
                 sOperand = this.getImmOperand(type, dbgAddr);
             }
-            else if (typeMode == Debugger.TYPE_REG) {
+            else if (typeMode & Debugger.TYPE_REG) {
                 sOperand = this.getRegOperand((type & Debugger.TYPE_IREG) >> 8, type, dbgAddr);
             }
+
             if (!sOperand || !sOperand.length) {
                 sOperands = "INVALID";
                 break;
@@ -2472,7 +2483,8 @@ if (DEBUGGER) {
             } while (dbgAddrIns.addr != dbgAddr.addr);
         }
 
-        sLine += str.pad(sBytes, 11);
+        sLine += str.pad(sBytes, 10);
+        sLine += (type & Debugger.TYPE_UNDOC)? '*' : ' ';
         sLine += str.pad(sOpcode, 7);
         if (sOperands) sLine += ' ' + sOperands;
 
@@ -2503,14 +2515,7 @@ if (DEBUGGER) {
 
         switch (typeSize) {
         case Debugger.TYPE_BYTE:
-            /*
+            sOperand = str.toHex(this.getByte(dbgAddr, 1), 2);
-             * There's the occasional immediate byte we don't need to display (eg, the 0x0A
-             * following an AAM or AAD instruction), so we suppress the byte if it lacks a TYPE_IN
-             * or TYPE_OUT designation (and TYPE_BOTH, as the name implies, includes both).
-             */
-            if (type & Debugger.TYPE_BOTH) {
-                sOperand = str.toHex(this.getByte(dbgAddr, 1), 2);
-            }
             break;
         case Debugger.TYPE_SBYTE:
             sOperand = str.toHex((this.getByte(dbgAddr, 1) << 24) >> 24, 4);
@@ -2522,6 +2527,9 @@ if (DEBUGGER) {
             sOperand = "imm(" + str.toHexWord(type) + ')';
             break;
         }
+        if (type & Debugger.TYPE_MEM) {
+            sOperand = '[' + sOperand + ']';
+        }
         return sOperand;
     };
 
@@ -2536,9 +2544,12 @@ if (DEBUGGER) {
      */
     Debugger.prototype.getRegOperand = function(iReg, type, dbgAddr)
     {
-        var typeMode = type & Debugger.TYPE_MODE;
+        /*
-        var typeSize = type & Debugger.TYPE_SIZE;
+         * Although this breaks with assembler conventions, I'm going to experiment with some different
-        return Debugger.REGS[iReg];
+         * mnemonics; specifically, "[HL]" instead of "M".  This is also more in keeping with how getImmOperand()
+         * displays memory references (ie, by enclosing them in brackets).
+         */
+        return iReg == Debugger.REG_M? "[HL]" : Debugger.REGS[iReg];
     };
 
     /**

modules/pc8080/lib/messages.js

@@ -37,7 +37,7 @@ var Messages = {
     BUS:        0x00000040,
     MEM:        0x00000080,
     PORT:       0x00000100,
-    TIMER:      0x00000800,
+    CHIPSET:    0x00008000,
     KEYBOARD:   0x00010000,
     KEYS:       0x00020000,
     VIDEO:      0x00040000,

modules/pc8080/lib/video.js

@@ -49,10 +49,12 @@ if (NODE) {
  *
  *      screenWidth: width of the screen canvas, in pixels
  *      screenHeight: height of the screen canvas, in pixels
- *      aspect
- *      rotate
- *      addr
  *      screenColor: background color of the screen canvas (default is black)
+ *      aspectRatio
+ *      frameBuffer
+ *      interruptRate (eg, 120)
+ *      refreshRate (eg, 60)
+ *      rotation (eg, 90)
  *
  * @constructor
  * @extends Component
@@ -65,11 +67,72 @@ if (NODE) {
 function Video(parmsVideo, canvas, context, textarea, container)
 {
     Component.call(this, "Video", parmsVideo, Video, Messages.VIDEO);
+    this.interruptRate = parmsVideo['interruptRate'];
+    this.refreshRate = parmsVideo['refreshRate'] || 60;
     this.setReady();
 }
 
 Component.subclass(Video);
 
+/**
+ * initBus(cmp, bus, cpu, dbg)
+ *
+ * @this {Video}
+ * @param {Computer} cmp
+ * @param {Bus} bus
+ * @param {CPUSim} cpu
+ * @param {Debugger} dbg
+ */
+Video.prototype.initBus = function(cmp, bus, cpu, dbg)
+{
+    this.cmp = cmp;
+    this.bus = bus;
+    this.cpu = cpu;
+    this.dbg = dbg;
+};
+
+/**
+ * getRefreshRate()
+ *
+ * @this {Video}
+ * @return {number}
+ */
+Video.prototype.getRefreshRate = function()
+{
+    return Math.max(this.refreshRate, this.interruptRate);
+};
+
+/**
+ * updateScreen(n)
+ *
+ * Propagates the video buffer to the cell cache and updates the screen with any changes.  Forced updates
+ * are generally internal updates triggered by an I/O operation or other state change, while non-forced updates
+ * are the periodic updates coming from the CPU.
+ *
+ * For every cell in the video buffer, compare it to the cell stored in the cell cache, render if it differs,
+ * and then update the cell cache to match.  Since initCache() sets every cell in the cell cache to an
+ * invalid value, we're assured that the next call to updateScreen() will redraw the entire (visible) video buffer.
+ *
+ * @this {Video}
+ * @param {number} n (where 0 <= n < getRefreshRate() for a normal update, or -1 for a forced update)
+ */
+Video.prototype.updateScreen = function(n)
+{
+    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);
+    }
+};
+
 /**
  * Video.init()
  *

modules/shared/templates/components.xsl

@@ -1038,10 +1038,41 @@
 				<xsl:otherwise>false</xsl:otherwise>
 			</xsl:choose>
 		</xsl:variable>
+		<xsl:variable name="aspectRatio">
+			<xsl:choose>
+				<xsl:when test="@aspect"><xsl:value-of select="@aspect"/></xsl:when>
+				<xsl:when test="@aspectRatio"><xsl:value-of select="@aspectRatio"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="frameBuffer">
+			<xsl:choose>
+				<xsl:when test="@frameBuffer"><xsl:value-of select="@frameBuffer"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="interruptRate">
+			<xsl:choose>
+				<xsl:when test="@interruptRate"><xsl:value-of select="@interruptRate"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="refreshRate">
+			<xsl:choose>
+				<xsl:when test="@refreshRate"><xsl:value-of select="@refreshRate"/></xsl:when>
+				<xsl:otherwise>60</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="rotation">
+			<xsl:choose>
+				<xsl:when test="@rotation"><xsl:value-of select="@rotation"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
 		<xsl:call-template name="component">
 			<xsl:with-param name="machine" select="$machine"/>
 			<xsl:with-param name="class">video</xsl:with-param>
-			<xsl:with-param name="parms">,model:'<xsl:value-of select="$model"/>',mode:<xsl:value-of select="$mode"/>,screenWidth:<xsl:value-of select="$screenWidth"/>,screenHeight:<xsl:value-of select="$screenHeight"/>,memory:<xsl:value-of select="$memory"/>,switches:'<xsl:value-of select="$switches"/>',scale:<xsl:value-of select="$scale"/>,charCols:<xsl:value-of select="$charCols"/>,charRows:<xsl:value-of select="$charRows"/>,fontROM:'<xsl:value-of select="$fontROM"/>',screenColor:'<xsl:value-of select="$screenColor"/>',touchScreen:'<xsl:value-of select="$touchScreen"/>',autoLock:<xsl:value-of select="$autoLock"/></xsl:with-param>
+			<xsl:with-param name="parms">,model:'<xsl:value-of select="$model"/>',mode:<xsl:value-of select="$mode"/>,screenWidth:<xsl:value-of select="$screenWidth"/>,screenHeight:<xsl:value-of select="$screenHeight"/>,memory:<xsl:value-of select="$memory"/>,switches:'<xsl:value-of select="$switches"/>',scale:<xsl:value-of select="$scale"/>,charCols:<xsl:value-of select="$charCols"/>,charRows:<xsl:value-of select="$charRows"/>,fontROM:'<xsl:value-of select="$fontROM"/>',screenColor:'<xsl:value-of select="$screenColor"/>',touchScreen:'<xsl:value-of select="$touchScreen"/>',autoLock:<xsl:value-of select="$autoLock"/>,aspectRatio:<xsl:value-of select="$aspectRatio"/>,frameBuffer:<xsl:value-of select="$frameBuffer"/>,interruptRate:<xsl:value-of select="$interruptRate"/>,refreshRate:<xsl:value-of select="$refreshRate"/>,rotation:<xsl:value-of select="$rotation"/></xsl:with-param>
 		</xsl:call-template>
 	</xsl:template>
 

package.json

@@ -148,6 +148,7 @@
     "./modules/pc8080/lib/cpu.js",
     "./modules/pc8080/lib/cpusim.js",
     "./modules/pc8080/lib/cpuops.js",
+    "./modules/pc8080/lib/chipset.js",
     "./modules/pc8080/lib/rom.js",
     "./modules/pc8080/lib/ram.js",
     "./modules/pc8080/lib/keyboard.js",

versions/pc8080/1.21.7/components.xsl

@@ -1036,10 +1036,41 @@
 				<xsl:otherwise>false</xsl:otherwise>
 			</xsl:choose>
 		</xsl:variable>
+		<xsl:variable name="aspectRatio">
+			<xsl:choose>
+				<xsl:when test="@aspect"><xsl:value-of select="@aspect"/></xsl:when>
+				<xsl:when test="@aspectRatio"><xsl:value-of select="@aspectRatio"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="frameBuffer">
+			<xsl:choose>
+				<xsl:when test="@frameBuffer"><xsl:value-of select="@frameBuffer"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="interruptRate">
+			<xsl:choose>
+				<xsl:when test="@interruptRate"><xsl:value-of select="@interruptRate"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="refreshRate">
+			<xsl:choose>
+				<xsl:when test="@refreshRate"><xsl:value-of select="@refreshRate"/></xsl:when>
+				<xsl:otherwise>60</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
+		<xsl:variable name="rotation">
+			<xsl:choose>
+				<xsl:when test="@rotation"><xsl:value-of select="@rotation"/></xsl:when>
+				<xsl:otherwise>0</xsl:otherwise>
+			</xsl:choose>
+		</xsl:variable>
 		<xsl:call-template name="component">
 			<xsl:with-param name="machine" select="$machine"/>
 			<xsl:with-param name="class">video</xsl:with-param>
-			<xsl:with-param name="parms">,model:'<xsl:value-of select="$model"/>',mode:<xsl:value-of select="$mode"/>,screenWidth:<xsl:value-of select="$screenWidth"/>,screenHeight:<xsl:value-of select="$screenHeight"/>,memory:<xsl:value-of select="$memory"/>,switches:'<xsl:value-of select="$switches"/>',scale:<xsl:value-of select="$scale"/>,charCols:<xsl:value-of select="$charCols"/>,charRows:<xsl:value-of select="$charRows"/>,fontROM:'<xsl:value-of select="$fontROM"/>',screenColor:'<xsl:value-of select="$screenColor"/>',touchScreen:'<xsl:value-of select="$touchScreen"/>',autoLock:<xsl:value-of select="$autoLock"/></xsl:with-param>
+			<xsl:with-param name="parms">,model:'<xsl:value-of select="$model"/>',mode:<xsl:value-of select="$mode"/>,screenWidth:<xsl:value-of select="$screenWidth"/>,screenHeight:<xsl:value-of select="$screenHeight"/>,memory:<xsl:value-of select="$memory"/>,switches:'<xsl:value-of select="$switches"/>',scale:<xsl:value-of select="$scale"/>,charCols:<xsl:value-of select="$charCols"/>,charRows:<xsl:value-of select="$charRows"/>,fontROM:'<xsl:value-of select="$fontROM"/>',screenColor:'<xsl:value-of select="$screenColor"/>',touchScreen:'<xsl:value-of select="$touchScreen"/>',autoLock:<xsl:value-of select="$autoLock"/>,aspectRatio:<xsl:value-of select="$aspectRatio"/>,frameBuffer:<xsl:value-of select="$frameBuffer"/>,interruptRate:<xsl:value-of select="$interruptRate"/>,refreshRate:<xsl:value-of select="$refreshRate"/>,rotation:<xsl:value-of select="$rotation"/></xsl:with-param>
 		</xsl:call-template>
 	</xsl:template>
 

versions/pc8080/1.21.7/pc8080-dbg.js

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+function U(a){v.call(this,"ChipSet",a,U,32768);var b=a.model;b&&!ud[b]&&t("Unrecognized ChipSet model: "+b);this.Pa=ud[b];a.sound&&(this.W=null,window&&(this.W=window.AudioContext||window.webkitAudioContext),this.W&&new this.W);B(this)}x(U);var ud={SI1978:1978.1};m=U.prototype;m.ma=function(){return!1};
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-function sd(a){if(!ib(a))if(!a.G)A(a);else if(a.u&&a.B){if(a.u.length!=a.A)jb(a,"ROM size (0x"+p(a.u.length)+") does not match specified size ("+("0x"+p(a.A))+")");else{var b;b=a.H;if(rb(a.B,b,a.A,Ob)){for(var c=0;c<a.u.length;c++){var d=a.B,e=b+c;d.B[(e&d.A)>>>d.X].Wa(e&d.u,a.u[c]&255,e)}b=!0}else b=!1;if(b){b=[];"number"==typeof a.F?b.push(a.F):null!=a.F&&a.F.length&&(b=a.F);for(c=0;c<b.length;c++){for(var f=a,d=b[c],e=f.B,h=f.A,g=[],k=f.H>>>e.X;0<h&&k<e.B.length;)g.push(e.B[k++]),h-=e.ha;e=f.B;
+m.bc=function(a,b){var c=this.I;gb(this,a,null,b,"STATUS0",c);return c};m.cc=function(a,b){var c=this.S;gb(this,a,null,b,"STATUS1",c);return c};m.dc=function(a,b){var c=this.T;gb(this,a,null,b,"STATUS2",c);return c};m.ac=function(a,b){var c=this.D<<this.w>>8&255;gb(this,a,null,b,"SHIFT.RESULT",c);return c};m.gc=function(a,b,c){gb(this,a,b,c,"SHIFT.COUNT",null);this.w=b};m.ic=function(a,b,c){gb(this,a,b,c,"SOUND1",null);this.G=b};m.hc=function(a,b,c){gb(this,a,b,c,"SHIFT.DATA",null);this.D=b};
-f=f.A;h=0;for(d>>>=e.X;0<f&&d<e.B.length;){k=g[h++];if(!k)break;e.B[d++]=k;f-=e.ha}}delete a.u}}A(a)}}Ma(function(){for(var a=z(document,"pc8080","rom"),b=0;b<a.length;b++){var c=a[b],d=y(c),d=new qd(d);eb(d,c)}});function td(a){u.call(this,"RAM",a,td);this.F=a.addr;this.A=a.size;this.u=!1}x(td);m=td.prototype;m.Ma=function(a,b,c,d){this.B=b;this.b=c;this.C=d;A(this)};m.va=function(a,b){b||this.reset();return!0};m.ua=function(a){return a?this.save():!0};
+m.jc=function(a,b,c){gb(this,a,b,c,"SOUND2",null);this.H=b};var vd={0:U.prototype.bc,1:U.prototype.cc,2:U.prototype.dc,3:U.prototype.ac},wd={2:U.prototype.gc,3:U.prototype.ic,4:U.prototype.hc,5:U.prototype.jc};Ja(function(){for(var a=z(document,"pc8080","chipset"),b=0;b<a.length;b++){var c=a[b],d=y(c),d=new U(d);db(d,c)}});
-m.reset=function(){!this.u&&this.A&&rb(this.B,this.F,this.A,1)&&(this.u=!0,this.status(Math.floor(this.A/1024)+"Kb allocated"));this.u||t("No RAM allocated")};m.save=function(){return null};m.restore=function(){return!0};Ma(function(){for(var a=z(document,"pc8080","ram"),b=0;b<a.length;b++){var c=a[b],d=y(c),d=new td(d);eb(d,c)}});function ud(a){u.call(this,"Keyboard",a,ud,65536);A(this)}x(ud);
+function xd(a){v.call(this,"ROM",a,xd);this.s=null;this.H=a.addr;this.w=a.size;this.D=a.alias;this.G=a.file;this.I=ba(this.G);if(this.G){a=this.G;var b=ca(this.I);"json"!=b&&"hex"!=b&&(a=na()+"/api/v1/dump?file="+this.G+"&format=bytes&decimal=true");var c=this;ma(a,null,!0,function(a,b,f){yd(c,a,b,f)})}}x(xd);xd.prototype.za=function(a,b,c,d){this.B=b;this.b=c;this.C=d;zd(this)};
-Ma(function(){for(var a=z(document,"pc8080","keyboard"),b=0;b<a.length;b++){var c=a[b],d=y(c),d=new ud(d);eb(d,c)}});function vd(a){u.call(this,"Video",a,vd,262144);A(this)}x(vd);
+xd.prototype.ua=function(){if(this.wa){if(this.C){var a=this.C,b=this.id,c=this.H,d=this.w,e=this.wa,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 n=f,k=[k>>>0,h],q=ia(n,k,a.Cb);0>q&&n.splice(-(q+1),0,k)}l&&(g.a=l.replace(/''/g,'"'))}a.I.push({lc:b,A:c,ec:d,wa:e,Bb:f})}delete this.wa}return!0};xd.prototype.ta=function(){return!0};
-Ma(function(){for(var a=z(document,"pc8080","video"),b=0;b<a.length;b++){var c=a[b],d=y(c),e=document.createElement("canvas");if(void 0===e||!e.getContext){c.innerHTML="<br/>Missing &lt;canvas&gt; support. Please try a newer web browser.";break}e.setAttribute("class","pcjs-canvas");e.setAttribute("width",d.screenWidth);e.setAttribute("height",d.screenHeight);e.style.backgroundColor=d.screenColor;e.style.height="auto";0<=ua().indexOf("MSIE")&&(c.onresize=function(a,b,c,d){return function(){b.style.height=
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-(a.clientWidth*d/c|0)+"px"}}(c,e,d.screenWidth,d.screenHeight),c.onresize());var f=+(d.aspect||Ra.aspect);f&&.3<=f&&3.33>=f&&(La("onresize",function(a,b,c){return function(){b.style.height=(a.clientWidth/c|0)+"px"}}(c,e,f)),window.onresize());c.appendChild(e);f=document.createElement("textarea");Aa("iOS")&&(f.setAttribute("autocapitalize","off"),f.setAttribute("autocorrect","off"));c.appendChild(f);e.getContext("2d");d=new vd(d);eb(d,c)}});
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+function zd(a){if(!lb(a))if(!a.G)B(a);else if(a.s&&a.B){if(a.s.length!=a.w)mb(a,"ROM size (0x"+p(a.s.length)+") does not match specified size ("+("0x"+p(a.w))+")");else{var b;b=a.H;if(ub(a.B,b,a.w,Qb)){for(var c=0;c<a.s.length;c++){var d=a.B,e=b+c;d.B[(e&d.G)>>>d.X].Ya(e&d.s,a.s[c]&255,e)}b=!0}else b=!1;if(b){b=[];"number"==typeof a.D?b.push(a.D):null!=a.D&&a.D.length&&(b=a.D);for(c=0;c<b.length;c++){for(var f=a,d=b[c],e=f.B,h=f.w,g=[],k=f.H>>>e.X;0<h&&k<e.B.length;)g.push(e.B[k++]),h-=e.ia;e=f.B;
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+break;case "k":var wf=f[0];if("?"==f[1])a.g("stack trace commands:"),a.g("\tk\tshow frame addresses"),a.g("\tks\tshow symbol information");else{var Zc=0,Be=V(),Bb=V(a.b.aa);for(a.g("stack trace for "+Z(Bb.A));10>Zc;){for(var Ma=null,xf=256;65536>Bb.A>>>0;){Be.A=a.lb(Bb,2);if(null==Bb.A||!xf--)break;for(var yf=a,jc=Be,Ce=null,Cb=jc.A,De=Cb,$c=1;6>=$c&&Cb;$c++){if(2<$c){jc.A=Cb;var kc=ge(yf,jc);if(0<kc.indexOf("CALL")){var Ee=kc.indexOf(" ");if(Cb+(kc.indexOf(" ",Ee+1)-Ee-1)/2==De){Ce=kc;break}}}Cb--}jc.A=
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+De;if(Ma=Ce)break}if(!Ma||null==Ma)break;var Fe=null;if("ks"==wf){var Ge=Ma.match(/[0-9A-F]+$/);Ge&&(Fe=Se(a,Ge[0]))}Ma=ga(Ma,50)+"  ;"+(Fe||"stack="+Z(Bb.A));a.g(Ma);Zc++}Zc||a.g("no return addresses found")}break;case "l":if("ln"==f[0]){Se(a,f[1],!0);break}break;case "m":a:{var wa,xa=null,A=f[1];"?"==A&&(A=void 0);if(void 0!==A){var Na=0;if("all"==A)Na=1610481663,A=null;else if("on"==A)xa=!0,A=null;else if("off"==A)xa=!1,A=null;else{"keys"==A&&(A="key");"kbd"==A&&(A="keyboard");for(wa in Ld)if(A==
-ye;if(Ia=xe)break}if(!Ia||null==Ia)break;var Ae=null;if("ks"==pf){var Be=Ia.match(/[0-9A-F]+$/);Be&&(Ae=Ke(a,Be[0]))}Ia=ga(Ia,50)+"  ;"+(Ae||"stack="+p(yb.w,4));a.g(Ia);Vc++}Vc||a.g("no return addresses found")}break;case "l":if("ln"==f[0]){Ke(a,f[1],!0);break}break;case "m":a:{var sa,ta=null,B=f[1];"?"==B&&(B=void 0);if(void 0!==B){var Ja=0;if("all"==B)Ja=1610481663,B=null;else if("on"==B)ta=!0,B=null;else if("off"==B)ta=!1,B=null;else{"keys"==B&&(B="key");"kbd"==B&&(B="keyboard");for(sa in Ed)if(B==
+wa){Na=Ld[wa];xa=!!(a.fa&Na);break}if(!Na){a.g("unknown message category: "+A);break a}}Na&&("on"==f[2]?(a.fa|=Na,xa=!0):"off"==f[2]&&(a.fa&=~Na,xa=!1))}var zf=0,Fa="";for(wa in Ld)if(!A||A==wa){var Af=!!(a.fa&Ld[wa]);if(null===xa||xa==Af)Fa&&(Fa+=","),++zf%10||(Fa+="\n\t"),"key"==wa&&(wa="keys"),Fa+=wa}void 0===A&&a.g("message commands:\n\tm [category] [on|off]\tturn categories on/off");a.g((null!==xa?xa?"messages on:  ":"messages off: ":"message categories:\n\t")+(Fa||"none"));Fd(a)}break;case "o":var ad=
-sa){Ja=Ed[sa];ta=!!(a.ga&Ja);break}if(!Ja){a.g("unknown message category: "+B);break a}}Ja&&("on"==f[2]?(a.ga|=Ja,ta=!0):"off"==f[2]&&(a.ga&=~Ja,ta=!1))}var sf=0,Ba="";for(sa in Ed)if(!B||B==sa){var tf=!!(a.ga&Ed[sa]);if(null===ta||ta==tf)Ba&&(Ba+=","),++sf%10||(Ba+="\n\t"),"key"==sa&&(sa="keys"),Ba+=sa}void 0===B&&a.g("message commands:\n\tm [category] [on|off]\tturn categories on/off");a.g((null!==ta?ta?"messages on:  ":"messages off: ":"message categories:\n\t")+(Ba||"none"));yd(a)}break;case "o":var Xc=
+f[1],Bf=f[2];if(ad&&"?"!=ad){var bd=Le(a,ad,"port #"),cd=Le(a,Bf);void 0!==bd&&void 0!==cd&&(Jb(a.B,bd,cd),a.g(r(bd)+": "+("0x"+p(cd,2))))}else a.g("output commands:"),a.g("\to [p] [b]\twrite byte [b] to port [p]"),a.g("warning: port accesses can affect hardware state");break;case "p":if("print"==f[0]){Te(a,b.substr(5));break}var He="pr"==f[0]?1:0,Cf=1+He;if(a.ba)a.g("step in progress");else{var dd=V(a.b.J);switch(a.U(dd)){case 205:a.ba=Cf,Nd(dd,3)}a.ba?(a.Ca(a.w,dd,!0),a.Ja()||(a.s&&a.s.jb(),a.ba=
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+0)):Ue(a,He?"tr":"t")}break;case "r":if("reset"==b){a.s&&a.s.reset();break}$d(a,f);break;case "t":Ue(a,f[0],f[1]);break;case "u":ae(a,f[1],f[2],8);break;case "v":if("var"==f[0]){Re(a,b.substr(3))||(d=!1);break}a.g("PC8080 version 1.21.7 ("+a.b.Pa+",RELEASE"+(nb?",TYPEDARRAYS":",LONGARRAYS")+")");a.g(oa());break;case "x":a:if(f[1]&&"?"!=f[1])switch(f[1]){case "cs":var Db;void 0!==f[3]&&(Db=+f[3]);switch(f[2]){case "int":a.b.i.Ra=Db;break;case "start":a.b.i.cb=Db;break;case "stop":a.b.i.Ta=Db;break;
-0)):Me(a,Ce?"tr":"t")}break;case "r":if("reset"==b){a.u&&a.u.reset();break}Td(a,f);break;case "t":Me(a,f[0],f[1]);break;case "u":Ud(a,f[1],f[2],8);break;case "v":if("var"==f[0]){Je(a,b.substr(3))||(d=!1);break}a.g("PC8080 version 1.21.7 ("+a.b.Ib+",RELEASE"+(kb?",TYPEDARRAYS":",LONGARRAYS")+")");a.g(ua());break;case "x":a:if(f[1]&&"?"!=f[1])switch(f[1]){case "cs":var Ab;void 0!==f[3]&&(Ab=+f[3]);switch(f[2]){case "int":a.b.j.Oa=Ab;break;case "start":a.b.j.ab=Ab;break;case "stop":a.b.j.Qa=Ab;break;
+default:a.g("unknown cs option");break a}void 0!==Db&&oc(a.b);a.g("checksums "+(a.b.u.Ma?"enabled":"disabled"));break;case "sp":void 0!==f[2]&&(tc(a.b,+f[2])||a.g("warning: using 1x multiplier, previous target not reached"));a.g("target speed: "+(a.b.i.Fa.toFixed(2)+"Mhz")+" ("+a.b.i.Ha+"x)");break;default:a.g("unknown option: "+f[1])}else a.g("execution options:"),a.g("\tcs int #\tset checksum cycle interval to #"),a.g("\tcs start #\tset checksum cycle start count to #"),a.g("\tcs stop #\tset checksum cycle stop count to #"),
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