HP Vectra XE320 hp vectra xe320, technical reference manual - Page 34

BIOS Overview DMA Channel Controllers Only "I/O-to-memory" and "memory-to-I/O" transfers are allowed. "I/O-to-I/O" and "memory-to-memory" transfers are disallowed by the hardware configuration. The system controller supports seven DMA channels, each with a page register used to extend the addressing range of the channel to 16 MB. The following table summarizes how the DMA channels are allocated. DMA controller Channel 0 1 2 3 4 5 6 7 Function Free Free if not used for parallel port in Setup Floppy disk controller Free if not used for parallel port in Setup Used to cascade DMA channels 0-3 Free Free Free Interrupt Controllers The Interrupt Requests (IRQs) are numbered sequentially, starting with the master controller, and followed by the slave. Windows XP and Windows 2000 IRQ (Interrupt Vector) Interrupt Request Description INTR ISA0 ISA1 ISA3 ISA4 ISA6 ISA8 ISA9 ISA12 ISA13 ISA14 ISA15 PCI5 PCI17 PCI19 PCI20 PCI 23 System Timer Standard 101/102-Key or Microsoft Natural PS/2 keyboard Communication Port (COM2) Communication Port (COM1) Standard Floppy Disk Controller System CMOS/real time clock Microsoft ACPI-Compliant System PS/2 Compatible Mouse Numeric data processor Primary IDE Channel Secondary IDE Channel Intel(R) 82801BA/BAM SMBus Controller - 2443 Intel(R) 82801BA/BAM AC'97 Audio Controller - 2445 Intel(R) 82801BA/BAM USB Universal Host Controller - 2442 Intel(R) PRO/100 VE Network Connection Intel(R) 82801BA/BAM USB Universal Host Controller - 2444 34 XE320 product description