Microsoft KB Archive/149706

= IRQ Conflict Using MicroGate SDLC Adapter =

Article ID: 149706

Article Last Modified on 11/26/2003

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APPLIES TO


 * Microsoft SNA Server 2.0, when used with:
 * Microsoft Windows NT 4.0
 * Microsoft SNA Server 2.1, when used with:
 * Microsoft Windows NT 4.0
 * Microsoft SNA Server 3.0, when used with:
 * Microsoft Windows NT 4.0
 * Microsoft SNA Server 3.0 Service Pack 4, when used with:
 * Microsoft Windows NT 4.0

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This article was previously published under Q149706



SYMPTOMS
The MicroGate SDLC Link Service may report an IRQ conflict if the MicroGate MG96 or MG144 SDLC adapter is installed in a SNA Server. When you select Adapter Details during the MicroGate link service installation, you will see information similar to the following if this problem occurs:

I/O Port Address: 0x380

Interrupt(IRQ): conflict?

DMA Channel: 1

The System Event Log may also contain the following errors:

  Event ID: 7001 Source: Service Control Manager Description: The SnaMG1 service depends on the IBMSYNC service which failed to start because of the following error: A device attached to  the system is not functioning.

Event ID: 7000 Source: Service Control Manager Description: The IBMSYNC service failed to start due to the following error: A device attached to the system is not functioning.



CAUSE
The MicroGate MG96 and MG144 SDLC adapters include a built-in V.32 modem. These adapters are hardwired to use IRQs 3 and 4. Microsoft Windows NT detects IRQ3 as being used by the UART on these adapters during its startup sequence.



WORKAROUND
Change the dip switches on the MicroGate SDLC adapter to have the UART use COM3, instead of COM2, which is the default. The changes must be made via dip switches on the adapter because they are not software configurable. The diagnostics software will allow you to make configuration changes and test the changes. However, the changes are written to a configuration file and do not change the adapter settings.

The default dip switch settings on the adapter are: S1: 1-8: 01111001 (0=off, 1=on) S2: 1-4: 1111 (all flipped up to ON position) Change the dip switches to: S1: 1-8: 10011001               S2: 1-4: 0111 This instructs the adapter to use COM3 for the UART. UART = COM3, Base Address = x'03e8', IRQ = 5

Additional query words: prodsna

Keywords: kbnetwork kbprb KB149706

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