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no DMA channel is available for use

I have set up 4 machines with the same hardware/software (AT-MIO-16E-2 and LabWindows/CVI) three machines run fine. When I try to run the fourth machine I recieve a Run-Time error -10455 (No DMA channel is available for use). The program I am running only uses one channel and is the same program as the other three machines.
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Just got it running. There was an IRQ conflict with an ISA 485 card.
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