Attachmate Advanced ISCA PCI Adapter Stays Pending

ID: Q247228

The information in this article applies to:

Microsoft SNA Server, versions 2.11 (all versions), 3.0 (all SP), 4.0, 4.0 SP1, 4.0 SP2, 4.0 SP3

SYMPTOMS

When you open an SDLC connection with an Attachmate Advanced ISCA PCI adapter, the connection may stay pending, and the Application event log may record the following error message:

Unable to Contact First Required Interrupt.

This problem occurs on some systems with a BIOS that assigns PCI interrupts to PCI adapters outside the ISA range of interrupt 1 through 15. This has been reported in the Compaq 3500 series.

WORKAROUND

To work around this issue, set the IRQ table to mapped IRQs. The following is an example of how to do this on a Compaq 3500:

Ensure the adapter is installed in BUS 0. To determine if the adapter is in BUS 0, locate the processor. The first 4 slots located closest to the processor are usually the first bus, BUS 0. The PCI specification calls out 4 bus loads (single adapters).

Press the F10 key during startup to access the BIOS.

Use the CTRL-A key combination to open the Advanced Features menu.

Choose Review the Hardware Settings.

In the View and Edit Details section, select the Full Table and Mapped option. This forces PCI devices to use IRQs 2 through 15.

MORE INFORMATION

A more thorough discussion of this issue is beyond the scope of this article; however, more information is available on the following Web sites:

http://www.compaq.com/support/techpubs/whitepapers
http://www.microsoft.com/hwdev/pci

The third-party products discussed in this article are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words:

Keywords :
Version : WINDOWS:2.11 (all versions),3.0 (all SP),4.0,4.0 SP1,4.0 SP2,4.0 SP3
Platform : WINDOWS
Issue type :