3C900 is not detected during unattended install of NT 4.0

FAQ: 3C900 is not detected or installed with Unattend WinNT 4.0 Install

QUESTION: When using a 3C900, during an unattended installation of WinNT 4.0, why does the system display an error message, saying that the information in the WinNT Answer File is Invalid or Missing. Using the same WinNT Answer File and a 3C905-TX, the installation will work fine.

ANSWER: This is because the OEMSETUP.INF file defaults to the 3C905-TX.

The only way to make this work is instead of "Automatically Detect and Install Adapter(s)", use "Specify adapter(s) to be Installed." The instructions below explain how to make it work:

1) Run SETUPMGR.EXE (located on the WinNT 4.0 Server CD under \Support\Deptools\I386) and load UNATTEND.TXT

2) Under the Networking Options, General tab, select Unattend Network Installation and Specifiy adapter(s) to be installed.

3) Under Adapters tab, leave Adapter Section Name as SelectedAdaptersSection.

4) Select Add... and then for the adapter select Other (OEM adapter installation).

5) Select Parameters... and enter the following:
Inf Option Name: 3C900
Location of OEM Files: C:\$WIN_NT$.~LS\i386\DRVLIB.NIC\3C90X

6) Select OK and then Save the file.

7) Edit UNATTEND.TXT and make the following changes (comment these files out) under the [Network] section by using a semicolon (;)

[Network]
; DetectAdapters = DetectAdaptersSection
InstallAdapters = SelectedAdaptersSection
InstallProtocols = ProtocolsSection
InstallServices = ServicesSection
JoinWorkgroup = Workgroup

; [DetectAdaptersSection]

[SelectedAdaptersSection]
3C900 = OEMCardParameters,C:\$WIN_NT$.~LS\i386\DRVLIB.NIC\3C90X

[OEMCardParameters]

Note: For some reason, it leaves the DetectAdapters keyword in the UNATTEND.TXT file when you save it. Also, when you reload it under SETUPMGR.EXE, it will say Specify adapter(s) to be detected, rather than Specify adapter(s) to be installed.