3Com 3C619B Fails Using Default Settings

• Microsoft Windows NT Workstation version 3.51
• Microsoft Windows NT Server version 3.51

SYMPTOMS

If you configure the 3Com TokenLink III network adapter (3C619B) with the default settings (3Com mode) using the DOS Configuration utility (3TOKDIAG.EXE) and start Windows NT, the following system events appear in the Event Viewer:

   Event ID: 5017
   Source: tlnk3
   Type: Warning
   Description: There is a memory conflict at address
   0x0000000000000000.

   Event ID: 5000
   Source: tlnk3
   Type : Error
   Description: Has encountered a conflict in resources
   and could not load.

CAUSE

The driver tries to load into an illegal memory address of 0x0 if the adapter is set for an I/O Port address of A20 or above.

These are the default settings of the 3C619B network adapter:

   Mode:        3com
   Base I/O:    A20
   Base (MMIO): CC000h
   Shared Ram:  D8000 - DBFFF
   Memory mode: 16
   I/O mode:    16

   Memory address      length
   0x0                 0x2000

   Port address        length
   0x110               0x4

WORKAROUND

To work around this problem:

• Configure the 3C619B network adapter to use an I/O port address below A20 in 3Com mode.

  -or-

• Configure the 3C619B network adapter as follows:

        Mode:        IBM
        Base I/O:    Primary
        Base (MMIO): CC000h
        Shared Ram:  D0000h
        Memory mode: 16
        I/O mode:    16
  
       In Windows NT, use the IBM Token Ring Adapter driver.
  
  

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 3.51. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

The 3Com product discussed here is manufactured by 3Com Corporation, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.