diff --git a/devices/pc8080/machine/invaders/machine.xml b/devices/pc8080/machine/invaders/machine.xml
index 1ce0c1f30..3c2ed75fa 100644
--- a/devices/pc8080/machine/invaders/machine.xml
+++ b/devices/pc8080/machine/invaders/machine.xml
@@ -9,7 +9,7 @@
 	<rom id="romF" addr="0x1000" size="0x0800" file="/devices/pc8080/rom/invaders/INVADERS-F.json"/>
 	<rom id="romE" addr="0x1800" size="0x0800" file="/devices/pc8080/rom/invaders/INVADERS-E.json"/>
 	<ram id="ram"  addr="0x2000" size="0x0400"/>
-	<video id="video" screenWidth="896" screenHeight="1024" screenRotate="90" smoothing="false" bufferAddr="0x2400" bufferCols="256" bufferRows="224" bufferBits="1" bufferLeft="0" interruptRate="120" width="40%" pos="left" padding="8px">
+	<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">
diff --git a/modules/pc8080/lib/bus.js b/modules/pc8080/lib/bus.js
index 763e0d6ef..d06290b6a 100644
--- a/modules/pc8080/lib/bus.js
+++ b/modules/pc8080/lib/bus.js
@@ -290,49 +290,53 @@ Bus.prototype.powerUp = function(data, fRepower)
  */
 Bus.prototype.addMemory = function(addr, size, type)
 {
-    var iBlock = addr >>> this.nBlockShift;
-    while (size > 0 && iBlock < this.aMemBlocks.length) {
+    var addrNext = addr;
+    var sizeLeft = size;
+    var iBlock = addrNext >>> this.nBlockShift;
+
+    while (sizeLeft > 0 && iBlock < this.aMemBlocks.length) {
 
         var block = this.aMemBlocks[iBlock];
         var addrBlock = iBlock * this.nBlockSize;
-        var sizeBlock = this.nBlockSize - (addr - addrBlock);
-        if (sizeBlock > size) sizeBlock = size;
+        var sizeBlock = this.nBlockSize - (addrNext - addrBlock);
+        if (sizeBlock > sizeLeft) sizeBlock = sizeLeft;
 
         if (block && block.size) {
             if (block.type == type) {
                 /*
                  * Where there is already a similar block with a non-zero size, we allow the allocation only if:
                  *
-                 *   1) addr + size <= block.addr (the request precedes the used portion of the current block), or
-                 *   2) addr >= block.addr + block.used (the request follows the used portion of the current block)
+                 *   1) addrNext + sizeLeft <= block.addr (the request precedes the used portion of the current block), or
+                 *   2) addrNext >= block.addr + block.used (the request follows the used portion of the current block)
                  */
-                if (addr + size <= block.addr) {
-                    block.used += (block.addr - addr);
-                    block.addr = addr;
+                if (addrNext + sizeLeft <= block.addr) {
+                    block.used += (block.addr - addrNext);
+                    block.addr = addrNext;
                     return true;
                 }
-                if (addr >= block.addr + block.used) {
-                    var sizeAvail = block.size - (addr - addrBlock);
-                    if (sizeAvail > size) sizeAvail = size;
-                    block.used = addr - block.addr + sizeAvail;
-                    addr = addrBlock + this.nBlockSize;
-                    size -= sizeAvail;
+                if (addrNext >= block.addr + block.used) {
+                    var sizeAvail = block.size - (addrNext - addrBlock);
+                    if (sizeAvail > sizeLeft) sizeAvail = sizeLeft;
+                    block.used = addrNext - block.addr + sizeAvail;
+                    addrNext = addrBlock + this.nBlockSize;
+                    sizeLeft -= sizeAvail;
                     iBlock++;
                     continue;
                 }
             }
-            return this.reportError(Bus.ERROR.ADD_MEM_INUSE, addr, size);
+            return this.reportError(Bus.ERROR.ADD_MEM_INUSE, addrNext, sizeLeft);
         }
 
-        var blockNew = new Memory(addr, sizeBlock, this.nBlockSize, type);
+        var blockNew = new Memory(addrNext, sizeBlock, this.nBlockSize, type);
         blockNew.copyBreakpoints(this.dbg, block);
         this.aMemBlocks[iBlock++] = blockNew;
 
-        addr = addrBlock + this.nBlockSize;
-        size -= sizeBlock;
+        addrNext = addrBlock + this.nBlockSize;
+        sizeLeft -= sizeBlock;
     }
 
-    if (size <= 0) {
+    if (sizeLeft <= 0) {
+        this.status(Math.floor(size / 1024) + "Kb " + Memory.TYPE.NAMES[type] + " at " + str.toHexWord(addr));
         return true;
     }
 
diff --git a/modules/pc8080/lib/computer.js b/modules/pc8080/lib/computer.js
index 14cff6b48..0828fc422 100644
--- a/modules/pc8080/lib/computer.js
+++ b/modules/pc8080/lib/computer.js
@@ -189,6 +189,8 @@ function Computer(parmsComputer, parmsMachine, fSuspended) {
         }
     }
 
+    this.println(Computer.APPNAME + " v" + Computer.APPVERSION + "\n" + Computer.COPYRIGHT + "\n" + Computer.LICENSE);
+
     if (DEBUG && this.messageEnabled()) this.printMessage("TYPEDARRAYS: " + TYPEDARRAYS);
 
     /*
@@ -743,15 +745,11 @@ Computer.prototype.donePowerOn = function(aParms)
         this.printMessage("Computer.donePowerOn(): redundant");
     }
 
+    this.fInitialized = true;
     this.flags.fPowered = true;
     var controlPower = this.bindings["power"];
     if (controlPower) controlPower.textContent = "Shutdown";
 
-    if (!this.fInitialized) {
-        this.println(Computer.APPNAME + " v" + Computer.APPVERSION + "\n" + Computer.COPYRIGHT + "\n" + Computer.LICENSE);
-        this.fInitialized = true;
-    }
-
     /*
      * Once we get to this point, we're guaranteed that all components are ready, so it's safe to power the CPU;
      * the CPU should begin executing immediately, unless a debugger is attached.
diff --git a/modules/pc8080/lib/memory.js b/modules/pc8080/lib/memory.js
index d49e8feb2..46881ac65 100644
--- a/modules/pc8080/lib/memory.js
+++ b/modules/pc8080/lib/memory.js
@@ -193,8 +193,8 @@ Memory.TYPE = {
     ROM:        2,
     VIDEO:      3,
     CTRL:       4,
-    NAMES:      ["NONE",  "RAM",  "ROM",   "VIDEO", "H/W"],
-    COLORS:     ["black", "blue", "green", "cyan"]
+    COLORS:     ["black", "blue", "green", "cyan"],
+    NAMES:      ["N/A", "RAM", "ROM", "VID", "H/W"]
 };
 
 /*
diff --git a/modules/pc8080/lib/ram.js b/modules/pc8080/lib/ram.js
index 525e878a4..635ad435e 100644
--- a/modules/pc8080/lib/ram.js
+++ b/modules/pc8080/lib/ram.js
@@ -136,7 +136,6 @@ RAM.prototype.reset = function()
     if (!this.fAllocated && this.sizeRAM) {
         if (this.bus.addMemory(this.addrRAM, this.sizeRAM, Memory.TYPE.RAM)) {
             this.fAllocated = true;
-            this.status(Math.floor(this.sizeRAM / 1024) + "Kb allocated");
         }
     }
     if (!this.fAllocated) {
diff --git a/modules/pc8080/lib/video.js b/modules/pc8080/lib/video.js
index 40e7dc610..10638b344 100644
--- a/modules/pc8080/lib/video.js
+++ b/modules/pc8080/lib/video.js
@@ -50,14 +50,14 @@ if (NODE) {
  *      screenWidth: width of the screen canvas, in pixels
  *      screenHeight: height of the screen canvas, in pixels
  *      screenColor: background color of the screen canvas (default is black)
- *      screenRotate: the amount of counter-clockwise screen rotation required (eg, 90)
+ *      screenRotate: the amount of counter-clockwise screen rotation required (eg, -90 or 270)
  *      aspectRatio (eg, 1.33)
  *      bufferAddr: the starting address of the frame buffer (eg, 0x2400)
  *      bufferCols: the width of a single frame buffer row, in pixels (eg, 256)
  *      bufferRows: the number of frame buffer rows (eg, 224)
  *      bufferBits: the number of bits per column (default is 1)
  *      bufferLeft: the bit position of the left-most pixel in a byte (default is 0; CGA uses 7)
- *      bufferRotate: the amount of counter-clockwise buffer rotation required (eg, 90)
+ *      bufferRotate: the amount of counter-clockwise buffer rotation required (eg, -90 or 270)
  *      interruptRate: normally the same as (or some multiple of) refreshRate (eg, 120)
  *      refreshRate: how many times updateScreen() should be performed per second (eg, 60)
  *
@@ -72,10 +72,10 @@ if (NODE) {
  * been redrawn), so we need an interrupt rate of 120Hz.  We pass the higher rate on to the CPU, so that
  * it will call updateScreen() more frequently, but we still limit our screen updates to every *other* call.
  *
- * bufferRotate is an alternative to screenRotate; you may set one or the other (but not both) to 90 to
- * enable different approaches to 90-degree image rotation.  screenRotate uses canvas transformation methods
- * (ie, translate(), rotate(), and scale()), while bufferRotate inverts the dimensions of the off-screen
- * buffer and then relies on setPixel() to rotate the data into it.
+ * bufferRotate is an alternative to screenRotate; you may set one or the other (but not both) to -90 to
+ * enable different approaches to counter-clockwise 90-degree image rotation.  screenRotate uses canvas
+ * transformation methods (translate(), rotate(), and scale()), while bufferRotate inverts the dimensions
+ * of the off-screen buffer and then relies on setPixel() to rotate the data into it.
  *
  * @constructor
  * @extends Component
@@ -102,6 +102,14 @@ function Video(parmsVideo, canvas, context, textarea, container)
     this.nBitsPerPixel = parmsVideo['bufferBits'] || 1;
     this.iBitFirstPixel = parmsVideo['bufferLeft'] || 0;
     this.rotateBuffer = parmsVideo['bufferRotate'];
+    if (this.rotateBuffer) {
+        this.rotateBuffer = this.rotateBuffer % 360;
+        if (this.rotateBuffer > 0) this.rotateBuffer -= 360;
+        if (this.rotateBuffer != -90) {
+            this.notice("unsupported buffer rotation: " + this.rotateBuffer);
+            this.rotateBuffer = 0;
+        }
+    }
 
     this.interruptRate = parmsVideo['interruptRate'];
     this.refreshRate = parmsVideo['refreshRate'] || 60;
@@ -134,10 +142,17 @@ function Video(parmsVideo, canvas, context, textarea, container)
     }
 
     this.rotateScreen = parmsVideo['screenRotate'];
-    if (this.rotateScreen == 90) {
-        this.contextScreen.translate(0, this.cyScreen);
-        this.contextScreen.rotate((-this.rotateScreen * Math.PI)/180);
-        this.contextScreen.scale(this.cyScreen/this.cxScreen, this.cxScreen/this.cyScreen);
+    if (this.rotateScreen) {
+        this.rotateScreen = this.rotateScreen % 360;
+        if (this.rotateScreen > 0) this.rotateScreen -= 360;
+        if (this.rotateScreen != -90) {
+            this.notice("unsupported screen rotation: " + this.rotateScreen);
+            this.rotateScreen = 0;
+        } else {
+            this.contextScreen.translate(0, this.cyScreen);
+            this.contextScreen.rotate((this.rotateScreen * Math.PI)/180);
+            this.contextScreen.scale(this.cyScreen/this.cxScreen, this.cxScreen/this.cyScreen);
+        }
     }
 
     this.initColors();
diff --git a/modules/pcjs/lib/computer.js b/modules/pcjs/lib/computer.js
index 495f1f6d2..c4c9b711b 100644
--- a/modules/pcjs/lib/computer.js
+++ b/modules/pcjs/lib/computer.js
@@ -218,6 +218,8 @@ function Computer(parmsComputer, parmsMachine, fSuspended) {
         }
     }
 
+    this.println(Computer.APPNAME + " v" + Computer.APPVERSION + "\n" + Computer.COPYRIGHT + "\n" + Computer.LICENSE);
+
     if (DEBUG && this.messageEnabled()) this.printMessage("PREFETCH: " + PREFETCH + ", TYPEDARRAYS: " + TYPEDARRAYS);
 
     /*
@@ -778,15 +780,11 @@ Computer.prototype.donePowerOn = function(aParms)
         this.printMessage("Computer.donePowerOn(): redundant");
     }
 
+    this.fInitialized = true;
     this.flags.fPowered = true;
     var controlPower = this.bindings["power"];
     if (controlPower) controlPower.textContent = "Shutdown";
 
-    if (!this.fInitialized) {
-        this.println(Computer.APPNAME + " v" + Computer.APPVERSION + "\n" + Computer.COPYRIGHT + "\n" + Computer.LICENSE);
-        this.fInitialized = true;
-    }
-
     /*
      * Once we get to this point, we're guaranteed that all components are ready, so it's safe to power the CPU;
      * the CPU should begin executing immediately, unless a debugger is attached.