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Channel Number: 4
Bus Line: No
Typical Default Use: Cascade for DMA channels 5 to 7.
Other Common Uses: None; for system use only.
Description: This DMA channel is reserved for cascading the two DMA controllers on systems with a 16-bit ISA bus. It is not available for use by peripherals.
Conflicts: There should not be any conflicts on this channel; any problems with it indicate a possible system hardware failure.