diff --git a/devices/pc8080/machine/vt100/machine.xml b/devices/pc8080/machine/vt100/machine.xml
index ca5234a28..d13953d86 100644
--- a/devices/pc8080/machine/vt100/machine.xml
+++ b/devices/pc8080/machine/vt100/machine.xml
@@ -26,5 +26,5 @@
 	<chipset id="chipset" model="VT100"/>
 	<keyboard id="keyboard"/>
 	<panel ref="/devices/pc8080/panel/wide.xml"/>
-	<debugger id="debugger" messages="port|mem|halt" commands="s 8086"/>
+	<debugger id="debugger" messages="port|mem" commands="s 8086"/>
 </machine>
diff --git a/modules/pc8080/lib/chipset.js b/modules/pc8080/lib/chipset.js
index 237cb15b8..012213678 100644
--- a/modules/pc8080/lib/chipset.js
+++ b/modules/pc8080/lib/chipset.js
@@ -194,6 +194,9 @@ ChipSet.VT100 = {
     DC011: {                            // generates Line Buffer Addresses (LBAs) for the Video Processor
         PORT:       0xC2,               // write-only
         INIT:       0x00
+    },
+    LBA: {                              // used to simulate LBA0 through LBA7 (LBA7 is used to drive NVR_CLK)
+        INIT:       0x00
     }
 };
 
@@ -312,7 +315,8 @@ ChipSet.VT100.init = [
         ChipSet.VT100.NVR_LATCH.INIT,
         ChipSet.VT100.FLAGS_BUFFER.NO_AVO | ChipSet.VT100.FLAGS_BUFFER.NO_GFX,
         ChipSet.VT100.DC012.INIT,
-        ChipSet.VT100.DC011.INIT
+        ChipSet.VT100.DC011.INIT,
+        ChipSet.VT100.LBA.INIT
     ]
 ];
 
@@ -344,7 +348,7 @@ ChipSet.prototype.save = function()
         state.set(0, [this.bStatus0, this.bStatus1, this.bStatus2, this.wShiftData, this.bShiftCount, this.bSound1, this.bSound2]);
         break;
     case ChipSet.VT100.MODEL:
-        state.set(0, [this.bBrightnessLatch, this.bNVRLatch]);
+        state.set(0, [this.bBrightnessLatch, this.bNVRLatch, this.bFlagsBuffer, this.bDC012, this.bDC011, this.bLBA]);
         break;
     }
     return state.data();
@@ -379,6 +383,7 @@ ChipSet.prototype.restore = function(data)
             this.bFlagsBuffer = a[2];
             this.bDC012 = a[3];
             this.bDC011 = a[4];
+            this.bLBA = a[5];
             return true;
         }
     }
@@ -413,19 +418,6 @@ ChipSet.prototype.stop = function()
      */
 };
 
-/**
- * isVideoEnabled()
- *
- * TODO: Consider moving this and the related ports (ie, DC011 and DC012) into the Video component.
- *
- * @this {ChipSet}
- * @return {boolean}
- */
-ChipSet.prototype.isVideoEnabled = function()
-{
-    return this.model != ChipSet.VT100.MODEL || this.bDC011 != 0;
-};
-
 /**
  * updateStatus0(bit, fSet)
  *
@@ -604,7 +596,8 @@ ChipSet.prototype.outSIWatchdog = function(port, b, addrFrom)
  */
 ChipSet.prototype.inVT100FlagsBuffer = function(port, addrFrom)
 {
-    var b = this.bFlagsBuffer;
+    this.bLBA++;
+    var b = this.bFlagsBuffer = (this.bFlagsBuffer & ~ChipSet.VT100.FLAGS_BUFFER.NVR_CLK) | ((this.bLBA & 0x80)? ChipSet.VT100.FLAGS_BUFFER.NVR_CLK : 0);
     this.printMessageIO(port, null, addrFrom, "FLAGS.BUFFER", b, true);
     return b;
 };
diff --git a/modules/pc8080/lib/video.js b/modules/pc8080/lib/video.js
index 21f128a5b..409ddf36b 100644
--- a/modules/pc8080/lib/video.js
+++ b/modules/pc8080/lib/video.js
@@ -279,10 +279,13 @@ Video.VT100 = {
     },
     LINETERM:       0x7F,
     LINEATTR: {
-        ADDRMASK:   0x1F,
+        ADDRMASK:   0x0F,
+        ADDRBIAS:   0x10,       // 1 == ADDRBIAS_LO, 0 = ADDRBIAS_HI
         FONTMASK:   0x60,
         SCROLL:     0x80
-    }
+    },
+    ADDRBIAS_LO:    0x2000,
+    ADDRBIAS_HI:    0x4000
 };
 
 /**
@@ -635,7 +638,7 @@ Video.prototype.powerUp = function(data, fRepower)
                         fBreak = true;
                     }
                 }
-                b = (font & Video.VT100.LINEATTR.FONTMASK) | ((addrNext >> 8) & Video.VT100.LINEATTR.ADDRMASK);
+                b = (font & Video.VT100.LINEATTR.FONTMASK) | ((addrNext >> 8) & Video.VT100.LINEATTR.ADDRMASK) | Video.VT100.LINEATTR.ADDRBIAS;
                 this.bus.setByteDirect(addr++, b);
                 this.bus.setByteDirect(addr++, addrNext & 0xff);
                 if (fBreak) break;
@@ -978,7 +981,8 @@ Video.prototype.updateVT100 = function()
             if ((data & Video.VT100.LINETERM) == Video.VT100.LINETERM) {
                 var b = this.bus.getByteDirect(addr++);
                 fontNext = b & Video.VT100.LINEATTR.FONTMASK;
-                addrNext = this.addrBuffer | ((b & Video.VT100.LINEATTR.ADDRMASK) << 8) | this.bus.getByteDirect(addr);
+                addrNext = ((b & Video.VT100.LINEATTR.ADDRMASK) << 8) | this.bus.getByteDirect(addr);
+                addrNext += (b & Video.VT100.LINEATTR.ADDRBIAS)? Video.VT100.ADDRBIAS_LO : Video.VT100.ADDRBIAS_HI;
                 break;
             }
             if (nCols < this.abLineBuffer.length) {
@@ -992,7 +996,6 @@ Video.prototype.updateVT100 = function()
          * Skip the first few "fill lines"
          */
         if (nFill) {
-            this.assert(nCols === 0);           // "fill lines" are typically zero-length
             nFill--;
             continue;
         }
@@ -1004,22 +1007,19 @@ Video.prototype.updateVT100 = function()
             this.abLineBuffer[nCols++] = 0;     // character code 0 is a empty font character
         }
 
-        this.assert(font >= 0);                 // font isn't valid on the first line, but that's always a "fill line"
-
         /*
-         * Display the line buffer
+         * Display the line buffer; ordinarily, font would always be valid after processing the "fill lines",
+         * but if the buffer was filled with garbage, the usual LINETERM might be missing, so font might not be set.
          */
-        for (var iCol = 0; iCol < nCols; iCol++) {
-            data = this.abLineBuffer[iCol];
-            if (!this.fCellCacheValid || data !== this.aCellCache[iCell]) {
-                /*
-                 * TODO: If bit 8 is set, we must select a different font variation, depending on which per-character
-                 * screen attribute is currently enabled (ie, reverse video or underline).
-                 */
-                this.updateChar(font, iCol, nRows, data, this.contextBuffer);
-                cUpdated++;
+        if (font >= 0) {
+            for (var iCol = 0; iCol < nCols; iCol++) {
+                data = this.abLineBuffer[iCol];
+                if (!this.fCellCacheValid || data !== this.aCellCache[iCell]) {
+                    this.updateChar(font, iCol, nRows, data, this.contextBuffer);
+                    cUpdated++;
+                }
+                iCell++;
             }
-            iCell++;
         }
         nRows++;
     }
@@ -1090,7 +1090,7 @@ Video.prototype.updateScreen = function(n)
         this.printMessage("updateScreen(" + n + "): clean=" + fClean + ", update=" + fUpdate + ", cycles=" + nCycles + ", delta=" + nCyclesDelta);
     }
 
-    if (!fUpdate || this.chipset && !this.chipset.isVideoEnabled()) {
+    if (!fUpdate) {
         return;
     }