IBM B50 User Manual

Page 151

For integrated ISA adapters, CD is equal to a unique code identifying the ISA
adapter. In most cases, this code is equal to the adapter's physical location code.
In cases where a physical location code is not available, CD is FF.

EF is the connector ID, used to identify the adapter's connector to which a resource
is attached.

GH is used to identify a port, device, or FRU. For example:

For async devices, GH defines the port on the fanout box. The values are 00 to
15.

For a diskette drive, H identifies either diskette drive 1 or 2. G is always 0.

For all other devices, GH is equal to 00.

For integrated adapter, EF-GH is the same as the definition for a pluggable adapter.
For example, the location code for a diskette drive is 01-D1-00-00. A second
diskette drive is 01-D1-00-01.

SCSI devices/drives

The location code for SCSI devices and drives is defined as:

AB-CD-EF-G,H

devfunc Number, Adapter Number or Physical Location

Bus Type or PCI Parent Bus

Where:

AB-CD-EF are the same as non-SCSI devices.

G defines the control unit address of the device. Values of 0 to 15 are valid.

H defines the logical unit address of the device. Values of 0 to 255 are valid.

A bus location code is also generated as 00-XXXXXXXX, where XXXXXXXX is
equivalent to the node's unit address.

Chapter 6. Location Codes

6-5