IBM DIAGS.COM Token Ring Utility Must Run in MS-DOS Mode

• Microsoft Windows 95

SYMPTOMS

When you try to run the IBM DIAGS.COM utility in a windowed MS-DOS prompt session, the utility does not run and you receive the following error message:

This program has performed an illegal operation and will be terminated. Quit all programs, and then restart your computer.

   The program tried to execute an invalid instruction. 

CAUSE

This error occurs because the DIAGS.COM utility tries to access the Token Ring adapter directly. This adapter is protected by the Windows 95 protected-mode network adapter driver.

RESOLUTION

To work around this problem, run the DIAGS.COM utility in MS-DOS mode. To do so, follow these steps:

1. Locate the DIAGS.PIF file.



2. Use the right mouse button to click the DIAGS.PIF file, then click Properties on the menu that appears.



3. Click the Program tab, then click the Advanced button.



4. Click the MS-DOS Mode check box, then click OK.

MORE INFORMATION

The DIAGS.COM utility is used to test IBM 16/4 Token Ring adapters.

The third-party product discussed in this article is manufactured by a vendor independent of Microsoft; we make no warranty, implied or other- wise, regarding this product's performance or reliability.

Additional query words: tr token-ring token/ring 16-4

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