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		Notes on Configuring the DEC FDDIcontroller/PCI
-----------------------------------------------------------------------------

PCI controllers are designed to be auto-configured through a system PCI
BIOS or firmware.  Some systems include a system configuration utility 
either built into the BIOS or run as a standalone utility.  These utilities 
may offer configuration options for PCI slots.

For those systems that include user-configurable options for PCI slots,
some of the options offered may include:

	PCI Slot Enable/Disable
		This option selects whether the PCI slot is enabled or
		disabled.  For the DEC FDDIcontroller/PCI adapter, the
		PCI slot must be enabled.
	
	Bus Master Enable/Disable
		This option selects whether PCI Bus Mastering is enabled
		or disabled for this PCI slot.  The DEC FDDIcontroller/PCI
		must be installed in a Bus Mastering slot and should have
		Bus Mastering enabled.

	Interrupt Level (IRQ) Select
		This option selects which interrupt level or IRQ value
		is chosen for this PCI slot.  The DEC FDDIcontroller/PCI
		must have an interrupt selected.  Also, depending on the
		driver and operating system used, support for interrupt
		sharing may or may not be supported.  Check the table at
		the end of this file to determine whether your 
		configuration supports interrupt sharing.
	
	Interrupt Triggering
		This option selects which triggering method is chosen
		for this PCI slot (edge-triggering or level-triggering).
		The DEC FDDIcontroller/PCI must be installed in a PCI
		slot configured for level-triggered interrupts.
	
	Latency Timer Select
		This option selects the Latency Timer setting for this
		PCI slot.  This value affects the amount of time that
		the adapter may master the PCI bus per ownership.  For
		most configurations, a Latency Timer value of 88h is
		appropriate.

The following rules may prove useful in resolving PCI configuration 
process problems:

- Install the DEC FDDIcontroller/PCI in a Bus Mastering capable PCI slot.

- If the system offers user-configurable PCI options, configure the PCI
  slot as follows:

	1. Enable the PCI slot.
	2. Enable Bus Mastering.
	3. Select a non-shared interrupt level.
	4. Select level-triggering.
	5. Set a Latency Timer value of 88h.

- If it is impossible to set a non-shared interrupt level, check the chart
  at the end of this file to determine whether your driver and operating
  system platform supports shared interrupts.  If so, select an interrupt
  level that is shared with other controllers that also support shared
  interrupts.  Note: Even though a driver for the DEC FDDIcontroller/PCI
  supports shared interrupts it does NOT mean that other controllers in
  the system support shared interrupts.  It is ALWAYS safer to select
  unique interrupt levels for each device in the system.

- If your system is still not behaving properly after trying various
  configuration options, try moving the PCI adapters to different slots.

Specific Configuration Options:

- Shared interrupts may be used with the NetWare 3/4 ODI server driver,
  SCO UNIX, Windows 95, and Windows NT drivers only.  All other drivers 
  require that the PCI slot be configured with a non-shared interrupt.

- All of the drivers require either 128 bytes of memory mapped or I/O
  mapped space for the adapter registers.  The addresses for these
  mappings should be automatically set by the PCI BIOS after enabling
  the PCI slot and installing the DEC FDDIcontroller/PCI adapter.

  The configuration options are summarized in the following table:

			 Shared Interrupts/  Maximum NICs
Driver File     Version   Promiscuous Mode    Supported
------------------------------------------------------------------------
DEFPA.COM        2.10          N / Y              4
DEFPA.SYS (OS/2) 1.01          N / N              4
DEFPA.LAN        3.30          Y / Y             16
DECMSL3X.MSL     2.00          N / N              1
DECMSL4X.MSL     2.00          N / N        limited by OS
DEFPA.DOS        2.19          N / Y              4
DEFPA.OS2        2.19          N / Y              4
DEFPA.SYS (95)   1.82          Y / Y        limited by OS
DEFPA.SYS (NT)   1.82          Y / Y        limited by OS
SCO UNIX (LLI)   2.0.0a        Y / Y              8
SCO UNIX (MDI)   3.2.0a        Y / Y              8

Key:

DEFPA.COM        - DOS ODI client driver
DEFPA.SYS (OS/2) - OS/2 ODI client driver
DEFPA.LAN        - ODI server driver
DECMSL3X.MSL     - SFT III 3.1X Mirrored-Server Link driver
DECMSL4X.MSL     - SFT III 4.X Mirrored-Server Link driver
DEFPA.DOS        - DOS NDIS 2.01 driver
DEFPA.OS2        - OS/2 NDIS 2.01 driver
DEFPA.SYS (95)   - Windows 95 NDIS 3 driver
DEFPA.SYS (NT)   - Windows NT NDIS 3 driver
SCO UNIX (LLI)   - SCO UNIX LLI device driver
SCO UNIX (MDI)   - SCO UNIX MDI device driver


			***TRADEMARKS***

  DEC, Digital, and DECpc are trademarks of Digital Equipment 
  Corporation. 

  Microsoft, MS, and MS-DOS are registered trademarks and Windows
  and Windows NT are trademarks of Microsoft Corporation.

  Novell, NetWare, and LAN WorkPlace are registered trademarks and 
  NetWare Loadable Module, NLM, and NetWare SFT are trademarks 
  of Novell, Incorporated.
  
  OS/2 is a registered trademark of International Business Machines
  Corporation.

  SCO is a registered trademark of The Santa Cruz Operation, Incorporated.

  UNIX is a registered trademark in the United States and other countries,
  licensed exclusively through X/Open Company Ltd.