diff -r 2daf59392c88 -r 32adc68f54f8 Hardware/LPC/IT87XX.cs
--- a/Hardware/LPC/IT87XX.cs	Mon Feb 08 20:23:24 2010 +0000
+++ b/Hardware/LPC/IT87XX.cs	Tue Feb 09 18:52:52 2010 +0000
@@ -69,10 +69,24 @@
       new byte[] { 0x18, 0x19, 0x1a, 0x81, 0x83 };
     private const byte VOLTAGE_BASE_REG = 0x20;  
     
-    private byte ReadByte(byte register) {
+    /* private byte ReadByte(byte register) {
       WinRing0.WriteIoPortByte(
         (ushort)(address + ADDRESS_REGISTER_OFFSET), register);
       return WinRing0.ReadIoPortByte((ushort)(address + DATA_REGISTER_OFFSET));
+    } */
+    private byte ReadByte(byte register) {
+      return new Utilities.HexStringArray(
+        @"19 00 00 00 00 00 00 00 00 80 3F C9 07 9B A3 FF
+          FF FF FF 73 D7 80 81 40 00 03 FF FF FF FF FF FF
+          50 70 D2 B9 BA 57 48 FF BD 24 24 2D 84 DC DC DC
+          FF FF FF FF FF FF FF FF FF FF EF FF FF FF FF FF
+          3C 7F 70 7F 70 7F 5F 74 2D 40 9C 22 FF FF FF FF
+          FF 15 7F 7F 7F 50 FF 56 90 0A 03 12 64 00 00 83
+          00 00 50 7F 10 24 FF FF 00 23 50 40 10 24 FF FF
+          7F 7F 7F 00 00 24 FF FF FF FF FF FF FF FF FF FF
+          19 00 00 00 00 00 00 00 00 80 3F C9 07 9B A3 FF
+          FF FF FF 73 D7 80 81 40 00 03 FF FF FF FF FF FF
+          50 70 D2 B9 BA 57 48 FF BD 24 24 2D 84 DC DC DC")[register];
     }
 
     public IT87XX(Chip chip, ushort address) : base (chip) {
@@ -162,7 +176,7 @@
         int value = ReadByte(FAN_TACHOMETER_REG[sensor.Index]);
         value |= ReadByte(FAN_TACHOMETER_EXT_REG[sensor.Index]) << 8;
 
-        if (value > 0) {
+        if (value > 0x3f) {
           sensor.Value = (value < 0xffff) ? 1.35e6f / ((value) * 2) : 0;
           if (sensor.Value > 0)
             ActivateSensor(sensor);