Added Debugger "int" command to manually request interrupts

devices/pc8080/machine/invaders/debugger/README.md

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+---
+layout: page
+title: Space Invaders (1978) with Debugger
+permalink: /devices/pc8080/machine/invaders/debugger/
+machines:
+  - type: pc8080
+    id: invaders
+    debugger: true
+---
+
+Space Invaders (1978) with Debugger
+-----------------------------------
+
+The [PC8080](/modules/pc8080/) machine below is configured to run [Space Invaders](/devices/pc8080/machine/invaders/)
+with a Control Panel and Debugger.  It is currently playable only in desktop browsers and uses the following hard-coded
+key mappings:
+
+- 1: One Player
+- 2: Two Player
+- 3: Insert Coin
+- A: Move Left
+- D: Move Right
+- L: Fire Missile
+
+Click the "Run" button when you're ready to start the simulation. 
+
+{% include machine.html id="invaders" %}

devices/pc8080/machine/invaders/debugger/machine.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<?xml-stylesheet type="text/xsl" href="/versions/pc8080/1.23.3/machine.xsl"?>
+<machine id="invaders" class="pc8080" border="1" pos="center" background="#FAEBD7">
+	<name pos="center">Space Invaders</name>
+	<computer id="computer" busWidth="16"/>
+	<cpu id="cpu8080" model="8080" cycles="2000000" autoStart="true"/>
+	<rom id="romH" addr="0x0000" size="0x0800" file="/devices/pc8080/rom/invaders/INVADERS-H.json"/>
+	<rom id="romG" addr="0x0800" size="0x0800" file="/devices/pc8080/rom/invaders/INVADERS-G.json"/>
+	<rom id="romF" addr="0x1000" size="0x0800" file="/devices/pc8080/rom/invaders/INVADERS-F.json"/>
+	<rom id="romE" addr="0x1800" size="0x0800" file="/devices/pc8080/rom/invaders/INVADERS-E.json"/>
+	<ram id="ram"  addr="0x2000" size="0x0400"/>
+	<video id="video" screenWidth="896" screenHeight="1024" bufferRotate="-90" smoothing="false" bufferAddr="0x2400" bufferCols="256" bufferRows="224" bufferBits="1" bufferLeft="0" interruptRate="120" width="40%" pos="left" padding="8px">
+		<menu>
+			<title>224x256 Screen (Rotated)</title>
+			<control type="container" pos="right">
+				<control type="button" binding="fullScreen" padleft="8px;line-height:1em">Full Screen</control>
+			</control>
+		</menu>
+	</video>
+	<chipset id="chipset" model="SI1978"/>
+	<keyboard id="keyboard"/>
+	<panel ref="/devices/pc8080/panel/left.xml"/>
+	<debugger id="debugger" commands="s 8086"/>
+</machine>