3C905B - Error: "No 3C90X NICs are installed in this computer" when DOS diagnostics run

Symptoms:
Error: "No 3C90X NICs are installed in this computer" when DOS diagnostics run
Cannot run DOS diagnostics

Solution:
1. The 3C905B-TX NIC requires 3Com Configuration and Diagnostic utility from EtherDisk 3.01, or later.
The program cannot be run with previous EtherDisk versions (such as 2.2a, 2.12, etc.)

2. If the latest EtherDisk is used and the error still occurs, turn off Plug and Play OS in the BIOS
Refer to PC documentation for instructions to access the BIOS

3. Make sure busmastering is enabled for the PCI slot, in the BIOS