Dma Channel Controllers; Interrupt Controllers - HP Vectra XE320 Technical Reference Manual

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.

Interrupt Controllers

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