PWM fan port connector

        static byte address = 0x09;

        private const byte ADDRESS_REGISTER_OFFSET = 0x05;
        private const byte DATA_REGISTER_OFFSET = 0x06;

        private const byte BANK_SELECT_REGISTER = 0x4E;

        static private readonly byte[] FAN_TACHO_REG =
            new byte[] { 0x28, 0x29, 0x2A, 0x3F, 0x53 };
        static private readonly byte[] FAN_TACHO_BANK =
            new byte[] { 0, 0, 0, 0, 5 };
        static private readonly byte[] FAN_BIT_REG =
            new byte[] { 0x47, 0x4B, 0x4C, 0x59, 0x5D };
        private readonly byte[] FAN_DIV_BIT0 = new byte[] { 36, 38, 30, 8, 10 };
        private readonly byte[] FAN_DIV_BIT1 = new byte[] { 37, 39, 31, 9, 11 };
        private readonly byte[] FAN_DIV_BIT2 = new byte[] { 5, 6, 7, 23, 15 };

        static private byte ReadByte(byte bank, byte register)
        {
            Ring0.WriteIoPort(
               (ushort)(address + ADDRESS_REGISTER_OFFSET), BANK_SELECT_REGISTER);
            Ring0.WriteIoPort(
               (ushort)(address + DATA_REGISTER_OFFSET), bank);
            Ring0.WriteIoPort(
               (ushort)(address + ADDRESS_REGISTER_OFFSET), register);
            return Ring0.ReadIoPort(
              (ushort)(address + DATA_REGISTER_OFFSET));
        }

        static private void WriteByte(byte bank, byte register, byte value)
        {
            Ring0.WriteIoPort(
               (ushort)(address + ADDRESS_REGISTER_OFFSET), BANK_SELECT_REGISTER);
            Ring0.WriteIoPort(
               (ushort)(address + DATA_REGISTER_OFFSET), bank);
            Ring0.WriteIoPort(
               (ushort)(address + ADDRESS_REGISTER_OFFSET), register);
            Ring0.WriteIoPort(
               (ushort)(address + DATA_REGISTER_OFFSET), value);
        }

        static void Main(string[] args)
        {

            int i;

            Ring0.Open();
            if (!Ring0.WaitIsaBusMutex(10))
                return;

            i = 0;
            byte fan; 
            fan = ReadByte(0, FAN_BIT_REG[i]);

            int count = ReadByte(FAN_TACHO_BANK[i], FAN_TACHO_REG[i]);


            Ring0.ReleaseIsaBusMutex();
            Ring0.Close();

            Console.WriteLine(fan);
            Console.WriteLine(count);

        }

[Port Connector Information] (Type 8)
08 09 17 00 01 FF 00 00 FF 46 52 4E 54 5F 46 41	.........FRNT_FA
4E 31 00 00                                    	N1..            
Type	0x08 (8)
Length	0x09 (9)
Handle	0x0017 (23)
Internal Reference Designator	String1 - "FRNT_FAN1"
Internal Connector Type	0xFF - Other 
External Reference Designator	NULL
External Connector Type	0x00 - None 
Port Type	0xFF - Other