Problem Using Mach32 ISA Display Adapter on PCI Bus

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To determine whether a computer has this problem, follow these steps:

1. Restart the computer at a command prompt. To do so, restart the computer, press the F8 key when you see the "Starting Windows 95" message, and then choose Command Prompt Only from the Startup menu.
2. At the command prompt, type the following line and then press ENTER:

   debug

3. At the "-" prompt, type the following line and then press ENTER:

   I 3c0

   If the result is 0, the computer has the problem described in this article. A typical result is 20h on most computers.
4. Type q and then press ENTER.
5. Restart the computer normally.

On computers that have this problem, the attribute controller does not preserve the bit flag indicating that the screen is in. It instead returns a flag indicating that the screen is off. When Windows 95 starts, the virtual display driver reads this value into memory and then later restores the value to the port. Since it reads a value of 0 and restores a value of 0, the screen is turned off.