HP Workstation x4000 hp workstation x4000 - Technical Reference manual - Windo - Page 67
DMA Channel Controllers, DMA controller, Channel, Function, Default Values for, I/O Address Ports
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System BIOS and Resources System Resources Default Values for I/O Address Ports C000 - C100 - C10F Function Power management I/O space and ACPI registers SMBus I/O space DMA Channel Controllers The system permits only I/O-to-memory and memory-to-I/O transfers. The hardware configuration doesn't allow I/O-to-I/O or memory-to-memory transfers. The system controller supports seven DMA channels, each with a page register that extends the channel's addressing range to 16MB. The following table shows how the system allocates DMA channels. DMA controller Channel DMA 0 DMA 1 DMA 2 DMA 3 DMA 4 DMA 5 DMA 6 DMA 7 Function Free Free if not used for parallel port in Setup Floppy disk drive controller Free if not used for parallel port in Setup Used to cascade DMA channels 0-3 Free Free Free Chapter 4 67
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