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controller. Each DMA channel has one Request and one Acknowledge line. A device that uses DMA must be configured to use both lines of the assigned DMA channel.

16-bit ISA permitted bus mastering.

Standard ISA DMA assignments:

PCI

A PCI architecture has no central DMA controller, unlike ISA. Instead, A PCI device can request control of the bus ("become the bus master") and request to read from and write to system memory.

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