Interrupt Controllers - HP Vectra VEi7 Technical Reference Manual

3 BIOS Overview
BIOS Addresses
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.
Channel
0 Free
Free if not used for parallel port or audio in Setup
1
2 Floppy disk controller
Free if not used for parallel port or audio in Setup
3
4 Used to cascade DMA channels 0-3
5 Free
6 Free
7 Free
1. DMA 1 is used for the parallel port by default
2. DMA 3 is used by audio by default

Interrupt Controllers

The Interrupt Requests (IRQ) are numbered sequentially, starting with
the master controller, and followed by the slave.
IRQ
(Interrupt Vector)
INTR
IRQ0 System Timer
IRQ1 Keyboard Controller
IRQ3 Free if not used for serial port
40
DMA controller
Function
Interrupt Request Description
1
2