Dma Channel Controllers - HP x4000 Technical Reference Manual

Default Values for
I/O Address Ports
C000 -
C100 - C10F

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
Chapter 4
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Function
Power management I/O space and ACPI
registers
SMBus I/O space
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
System BIOS and Resources
System Resources
67