Compaq AlphaServer DS20E Reference Manual page 183

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PCI bus information.
The "Slot" column lists the logical slots seen by the system.
NOTE: The naming of devices (for example, dqa.0.0.105.0) follows the
conventions described in the show device command. See Section
7.5.
In Example 7–2 the following devices are present:
PCI Hose 00
Bus 00 Slots 05/0 through 05/3 are part of the same chip
Slot 05/0 Cypress multifunction controller
Slot 05/1 IDE controller
Slot 05/2 IDE controller
Slot 05/3 No device present. System does not support USB.
Slot 06/0 On-board Adaptec controller
Slot 06/1 On-board Adaptec controller
Slot 07 PCI slot with Elsa Gloria VGA card
Slot 09 PCI slot with DE500-AA Ethernet controller
PCI Hose 01
Bus 00
Slot 07 NCR 53C895 SCSI controller; bus ID of controller; and
devices attached to controller
ISA
Slot 0 Mouse
Slot 1 Keyboard
Slot 2 COM1
Slot 3 COM2
Slot 4 LPT1 parallel port
Slot 5 Floppy drive
Using the SRM Console 7-15