HP Workstation x2000 hp workstation x2000 - Technical Reference and Troublesho - Page 93

HP BIOS BIOS Addresses Default Values for I/O Address Ports 03F7 03F8 - 03FF 04D0 - 04D1 0778 - 077F 0CF8 - 0CFF C000 C100 - C10F Function Floppy disk drive controller COM1 Interrupt edge/level control LPT1 ECP PCI configuration space 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 Interrupt Controllers The system's interrupt controller is equivalent in function to two 82C59 interrupt controllers. The following table shows how the interrupts are connected to the APIC controller. The IRQs are numbered sequentially, Chapter 3 93