PRB: OSR2 Sets Bridge Control Register ISA Enable BitID: Q169576
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PCI devices that are assigned I/O resources by the BIOS with the lower 10 bits in the range of 100-3FFh may not work properly when installed behind a PCI bridge on Windows 95 OSR2.
OSR2 sets the PCI Bridge Control Register ISA Enable bit. Setting the ISA
Enable bit causes the bridge to block I/O transactions to the device when
the lower 10 bits of the address are in the range 100h-3FFh. This results
in the following behavior:
I/O Range: (repeating pattern up to FFFF, only the first 10FFh bytes are
shown.)
1000 - 10FF Forward
D00 - FFF Block Forwarding
C00 - CFF Forward
900 - BFF Block Forwarding
800 - 8FF Forward
500 - 7FF Block Forwarding
400 - 4FF Forward
100 - 3FF Block Forwarding
0 - FF Forward
This problem has been resolved in the next version of the Windows operating system.
Keywords :
Version : 4.0
Platform : WINDOWS
Issue type :
Last Reviewed: March 3, 1999