Problem Using Mach32 ISA Display Adapter on PCI Bus
ID: Q137153
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The information in this article applies to:
SYMPTOMS
If you replace an ATI PCI Mach32 display adapter with an ISA Mach32
display adapter on certain computers with a PCI bus, the computer may stop
responding (hang) after the logo screen appears when you start Windows 95.
CAUSE
This problem occurs because of a hardware problem on the PCI bus.
RESOLUTION
The only workaround for this problem is to use the PCI Mach32 display
adapter instead of the ISA display adapter.
MORE INFORMATION
To determine whether a computer has this problem, follow these steps:
- 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.
- At the command prompt, type the following line and then press ENTER:
debug
- 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.
- Type q and then press ENTER.
- 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.
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