INSTALLATION INSTRUCTIONS FOR DIGI PC/X AND CLASSIC BOARD
    FOR WINDOWS NT 3.5x AND NT 4.0

There is a beta driver available for the Classic 4, 8, and 16
boards for Windows NT available either on our BBS (612-912-4800)
or our ftp site (ftp.dgii.com/support/drivers/winnt/beta/async).
In either case, the name of the downloadable file is clant100.exe.

The PC/X board will use the standard Microsoft serial driver
under Windows NT.  For the serial driver to know how the PC/X
board is configured, you will need to modify the registry to indicate
the I/O addresses and IRQ(s) you have set on your PC/X board.
You will NOT need to go to Control Panel, Network and add an adapter 
for this product.  Below are the instructions on how to modify 
the registry for installation of the PC/X under Windows NT. 

1.      Set your PC/X product for an available IRQ and port address range
        for use in your computer - verify the dip switch and jumper settings
        with the PC/X hardware manual.  

2.      Be sure that you have set a value for the status register (DS1 on
        the PC/X product).

3.	Start the registry editor by typing "START REGEDT32" from a command
	prompt. 

Caution: Careless editing in the Registry may have disasterous results and could
require	a complete reinstall of the WINDOWS NT operating system.

4.      If there are existing serial ports built in to your computer,
        skip this step.	

        If there are NO serial ports built into your computer, the following
	Values need to be added under the key:
	HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Serial:
	(For more information on using the Registry Editor, see "Editing
	Registry Values" in the WINNT Program Manager Readme and in the on-line
	help for the Registry editor.) 
	
        Add Value Names		Data Type		Data
	------------------------------------------------------------------
	ErrorControl		REG_DWORD		1
	ForceFifoEnable		REG_DWORD		1
	Group			REG_SZ			Extended base
	Rxfifo			REG_DWORD		8
        PermitShare             REG_DWORD               0
	Start			REG_DWORD		2
	Tag			REG_DWORD		1
	Type			REG_DWORD		1

5.	Using the Registry Editor, open the key:
	HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Serial\Parameters

6.      Add a key for each port on your PC/X product as indicated in 
        the example below.

Sample registry entries for a Digi PC/4, set with a status register
of 240h, I/O addresses for ports 1-4 set to 200-218h, and set for an
IRQ of 5, starting at COM3:

Add Key (no class)	Add Value Names		Data Type		Data
-------------------------------------------------------------------------------

Serial2			DosDevices		REG_SZ			COM3
			ForceFifoEnable		REG_DWORD		1
			Indexed			REG_DWORD		1
			Interrupt		REG_DWORD		5
			InterruptStatus		REG_DWORD		0x240
			PortAddress		REG_DWORD		0x200
			PortIndex		REG_DWORD		1

Serial3			DosDevices		REG_SZ			COM4
			ForceFifoEnable		REG_DWORD		1
			Indexed			REG_DWORD		1
			Interrupt		REG_DWORD		5
			InterruptStatus		REG_DWORD		0x240
			PortAddress		REG_DWORD		0x208
			PortIndex		REG_DWORD		2

Serial4			DosDevices		REG_SZ			COM5
			ForceFifoEnable		REG_DWORD		1
			Indexed			REG_DWORD		1
			Interrupt		REG_DWORD		5
			InterruptStatus		REG_DWORD		0x240
			PortAddress		REG_DWORD		0x210
			PortIndex		REG_DWORD		3

Serial5			DosDevices		REG_SZ			COM6
			ForceFifoEnable		REG_DWORD		1
			Indexed			REG_DWORD		1
			Interrupt		REG_DWORD		5
			InterruptStatus		REG_DWORD		0x240
			PortAddress		REG_DWORD		0x218
			PortIndex		REG_DWORD		4

7.	Exit from the registry editor, and enter the following two commands 
	at the command prompt to activate the changes:
				
                                NET STOP SERIAL
				NET START SERIAL
	
	The serial ports should now work.. Restarting Windows NT will also
	activate the changes.

Notes:


1.      The above instructions are for 8 port PC/X products.
        For 16 port PC/X boards, or for daisy-chained PC/X boards, 
        you will need to change the PermitShare value found under
        /HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/Serial from
        its default value of 0 to 1.  This will allow all serial ports that
        are added into the registry to use the same IRQ by the port polling
        method rather than by the interrupt polling method.  This change 
        also means that the InterruptStatus and PortIndex value(s) found 
        under /HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/Serial/
        Parameters are no longer required and MUST be omitted (the DS1 register
        on PC/X boards can be set to disabled). 

2.      When installing multiple PC/X cards (not daisy-chained), the 
        registry value "PortIndex" must begin at a value of 1 for each
        card , as shown in the example below:

        First PC/4:
        PC/4, Port 1:  PortIndex:REG_DWORD:0x1
        PC/4, Port 2:  PortIndex:REG_DWORD:0x2
        PC/4, Port 3:  PortIndex:REG_DWORD:0x3
        PC/4, Port 4:  PortIndex:REG_DWORD:0x4

        Second PC/4:
        PC/4, Port 1:  PortIndex:REG_DWORD:0x1
        PC/4, Port 2:  PortIndex:REG_DWORD:0x2
        PC/4, Port 3:  PortIndex:REG_DWORD:0x3
        PC/4, Port 4:  PortIndex:REG_DWORD:0x4
 
3.      It is recommended that your PC/X product have 16C550 UARTs
        for use with Windows NT.

4.      If you are writing your own application, COM1 through COM9 can be 
        directly referenced just like a filename from programs and from the
	command line. However, COM10 and above must be referenced with the
	following syntax: 

				\\.\COM10 

5.	The command line MODE command does not recognize ports above COM9.

6.      If you are not familiar with the registry, please call Digi tech
        support for assistance in making these changes at 1-612-912-3456.