Device Mapping
C–3
__________________________NOTE ____________________________
The Ethernet controller and PCI slot 0 (the lowest PCI slot) share the same IRQ.
Shared interrupt support is unavailable in the OpenVMS operating system.
Therefore, do not install an interrupting device in PCI slot 0 on OpenVMS
operating systems. Devices that rely on polled I/O should work if the device is
supported.
____________________________________________________________
DMA Channel Assignments
The DMA channel assignments for ISA options are shown in Table C–3. This information
is useful when adding ISA options to your system. Avoid DMA channel conflicts by not
assigning multiple devices to the same channel.
Table C–3: DMA Channel Assignments
Channel Device
0 Audio (or 87303 ECP parallel port).
1 Audio (or 87303 ECP parallel port).
2 Floppy disk controller (ISA option slot).
3 Audio (ISA option slot).
4 Unavailable. (Channels 0-3 are cascaded to this channel.)
5 Available to ISA slots.
6 Available to ISA slots.
7 Available to ISA slots.
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