Driver Installation - for Windows NT 4.0
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(1) Introduction:
-----------------
This document describes the procedure to install Windows NT v4.0
driver for ENW-9501 10/100Base-TX PCI Fast Ethernet Adapter.
(2) Location of compressed Driver:
----------------------------------
\WINNT40\DC21X4.SYS
(3) Driver Installation Procedures for Microsoft Windows NT:
------------------------------------------------------------
1. Select the "Control Panel" item.
2. In the Control Panel window, choose the "Network" icon.
3. In the Network Settings dialog box, choose the "Adapters" item.
4. When the dialog box pops up, press the "Add..." button.
5. When the list of adapters dialog box pops up, press
the "Have Disk" button.
6. Insert the driver disk in drive A, enter drive and pathname
A:\WINNT40 which is the path where the driver and setup
file OEMSETUP.INF are located, and then choose the "OK" button.
7. When the "Select OEM Option" dialog box pops up, select the
driver and press the "OK" button to install.
8. A dialog box pops up to select the followings:
ConnectionType:
o AutoSense Senses dynamically the media ports
supported by the adapter.
The precedence 100BaseTx, 10BaseT.
o AutoSense NoNway Sense dynamically the media supported
by the adapter without N-Way.
o 100BaseTx specify the 100Base-Tx Half-Duplex
o 100BaseTx Full_Duplex specify the 100Base-Tx Full Duplex
o 100BaseT4 not supported by the adapter
o 100BaseFX not supported by the adapter
o 100BaseFX Full_Duplex not supported by the adapter
o 10BaseT (Twisted Pair) specify the 10Base-T Half-Duplex
o 10BaseT Full_Duplex specify the 10Base-T Full-Duplex
9. Windows NT will then perform the binding process. If any
additional network software options were installed, you may
be prompted for specific information for these packages.
10. Restarting your system then you will acquire network service.
Note: If the adapter did not work fine after installation, try to
adjust TransmitThreshold and ReceiveBuffers.
(4). Parameters:
----------------
To overwrite the driver's default values, add or edit the following
values in the Registry DC21X4<adapter_number> Parameters subtree:
CacheLineSize = REG_DWORD { 16 | 32 | 64 | 128 }
16 bytes
32 bytes (default)
64 bytes
128 bytes
ExtraReceiveBuffers = REG_DWORD {value} (default: 16)
Number of buffers allocated by the
driver in the Receive look_aside list.
ExtraReceivePackets = REG_DWORD {value} (default: 100)
Number of packets preallocated by the driver.
InterruptMitigation = REG_DWORD {0 | 1} (DC21140,DC21142)
0 Disabled (default)
1 Enabled
Enable/disable the Interrupt Mitigation
algorithm.
InterruptThreshold = REG_DWORD {value} (default: 500)
Maximum number of interrupt/second allowed before
the Receive and Transmit interrupts get masked.
Meaningfull only when InterruptMitigation is enabled.
FrameThreshold = REG_DWORD {value} (default: 400)
Minimum number of processed frame/second allowed
before the Receive and Transmit interrupts get
unmasked.
Meaningfull only when InterruptMitigation is enabled.
NetworkAddress = REG_SZ { xx-xx-xx-xx-xx-xx }
Mandatory if no Serial ID PROM is plugged in
Overwrite the Serial ID PROM if plugged in
NetworkAddress 00-00-00-00-00-00 is ignored
NwayProtocol = REG_DWORD { 0 | 1 } (DC21041 and
DC21142 Rev1.0,1.1 only)
0 Disabled
1 Enabled (default)
Enable/disable the 10BT/10BT_FD Nway
medium negotiation in Autosense mode.
ReceiveBuffers = REG_DWORD {8..64} (default: 16)
Number of buffers allocated by the
driver in the Receive ring.
SoftwareCRC = REG_DWORD { 0 | 1 } (DC21040 rev 1.x, 2.0 & 2.2 only)
0 The CRC is generated by the adapter
1 (default) The CRC is generated by software for
transmit packets bigger than the transmit threshold.
NOTE: This option affects performances and could be
disabled if the adapter does not report transmit
underruns in its statistic counters
UnderrunRetry = REG_DWORD number_of_retries (default=2)
Maximun number of retransmission attempts of
an underrun packet.
UnderrunThreshold = REG_DWORD number_of_underruns (default=10)
For DC21140 and DC21142 only.
Maximun number of underrun occurences before the
controller switches to the next threshold value.
The following values allow to overwrite the DC21X4 default setting.
Refer to the Digital Semiconductor's DC21140\DC21140A Engineering
specifications for detailled description:
BackPressure = REG_DWORD { 0 | 1 } (not DC21040 rev1)
CSR6<BP> 0 Disabled (default)
1 Enabled
BurstLength = REG_DWORD { 0 | 1 | 2 | 4 | 8 | 16 | 32 }
CSR0<PBL> 0 unlimited (default) - (not 21040,
21041 & 21140 rev1)
1 doubleword
2 doublewords
4 doublewords
8 doublewords
16 doublewords (default for 21040,
21041 & 21140 rev1)
32 doublewords (not 21040 & 21041)
CaptureEffect = REG_DWORD { 0 | 1 } (not 21040 rev1)
CSR6<CA> 0 Disabled (Default)
1 Enabled
FifoArbitration = REG_DWORD { 0 | 1 }
CSR0<BAR> 0 Rcv/Txm Arbitration (default)
1 Round_Robin
SnoozeMode = REG_DWORD { 0 | 1 } (DC21041 only)
CFDA<SM> 0 Disabled (default)
1 Enabled
StopBackoffCounter = REG_DWORD { 0 | 1 } (not DC21040 rev1)
CSR6<SB> 0 Disabled (Default)
1 Enabled
StoreAndForward = REG_DWORD { 0 | 1 } (DC21140 only)
Select the StoreAndForward mode if high
PCI latencies causes 100Mbps Transmit Underruns
CSR6<SF> 1 Enabled
0 Disabled (default)
TransmitThreshold = REG_DWORD { 72 | 96 | 128 | 160 }
Transmit Threshold value for the 10Mbps media.
CSR6<TTM,TR> 72 bytes
96 bytes (default)
128 bytes
160 bytes
TransmitThreshold100 = REG_DWORD { 128 | 256 | 512 | 1024 }
Transmit Threshold value for the 100Mbps media.
Meaningless when StoreAndForward is set
CSR6<TTM,TR> 128 bytes
256 bytes
512 bytes (default)
1024 bytes
These Registry values can be edited interactively through the
Registry editor (winnt\system32\regedt32.exe) or by invoking
the regini command Edit an DC21X4.ini file as described below,
then invoke the command:
regini DC21X4.ini
DC21X4.ini format:
\Registry\Machine
System
CurrentControlSet
Services
DC21x4{adapter_number}
Parameters
{valuename} = {type}{value}
(5). Driver Revision number:
----------------------------
To retrieve the driver revision number either
select the file DC21X4.SYS and open the File Properties applet
or
query the Registry:
HKEY_LOCAL_MACHINE\
Software\DigitalEquipmentCorporation\DC21X4\CurrentVersion
MajorVersion
MinorVersion
(6). Error Messages:
--------------------
The error messages are logged in the Entry Log and can be seen
using the Entry Log Viewer (in WNT's Administration Tools group).
Each error message has a standard Ndis error code and an driver's
additional code.
The additional codes are:
DC21X4_ERRMSG_REGISTRY 0x01
DC21X4_ERRMSG_ALLOC_MEMORY 0x02
DC21X4_ERRMSG_SROM 0x03
DC21X4_ERRMSG_MEDIA 0x04
DC21X4_ERRMSG_LOAD_CAM 0x05
DC21X4_ERRMSG_SYSTEM_ERROR 0x06
DC21X4_ERRMSG_TXM_JABBER_TIMEOUT 0x07
(7). Driver Initialization Errors:
-----------------------------------
o NDIS_ERROR_CODE_UNSUPPORTED_CONFIGURATION
DC21X4_ERRMSG_REGISTRY
The AdapterType Registry's key is missing or its value is
unsupported by the adapter board
o NDIS_ERROR_CODE_ADAPTER_NOT_FOUND
No board matching the AdapterCFID Registry's key value was found
plugged into the PCI bus or in the slot specified in the Registry
o NDIS_ERROR_CODE_OUT_OF_RESOURCES
DC21X4_ERRMSG_ALLOC_MEMORY
Not enough memory to allocate space for the Adapter data block
o NDIS_ERROR_CODE_INVALID_VALUE_FROM_ADAPTER
DC21X4_ERRMSG_SROM
Invalid data read from the adapter's serial ROM
o NDIS_ERROR_CODE_NETWORK_ADDRESS
No readable burnt_in or software configured station address
o NDIS_ERROR_CODE_UNSUPPORTED_CONFIGURATION
DC21X4_ERRMSG_MEDIA
The selected media port is not supported by the board.
o NDIS_ERROR_CODE_INTERRUPT_CONNECT
Interrupt initialization failed
o NDIS_ERROR_CODE_TIMEOUT
DC21X4_ERRMSG_LOAD_CAM
DC21X4 CAM initialization failed
(8). Driver Run Time Errors:
----------------------------
o NDIS_ERROR_CODE_HARDWARE_FAILURE
DC21X4_ERRMSG_SYSTEM_ERROR
System_Error interrupt (bus parity error)
o NDIS_ERROR_CODE_HARDWARE_FAILURE
DC21X4_ERRMSG_TXM_JABBER_TIMEOUT
Transmit Jabber timer expired
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.