Configuration Table,
Continued
The components of the DCT are as follows:
Table 2–7 DCT Components
Name
Description
Minor version ID
Tracks minor changes in the device diagnostic routines
Major version ID
Tracks major changes in the devices diagnostic routines
Number of
devices
Number of directory entries for the device. A directory entry tells
the user where to find a particular component of code for the device.
Edit version ID
Device ID number
Device name
Device Name is ASCII. This is used by the show configuration utility
and the system test to display information about the device.
Pointer to driver
descriptors
Points to the drive descriptor area associated with the device.
Device status
Saved from the last time the self-test was run on the device. The
show configuration utility uses this field to display information
about the device. The device status is split into two words, the lower
word is the error field and the upper word is the field replaceable
unit (FRU) thought to be faulty.
Pointer to
extended status
Points to any extended information that is saved by the device
self-test
Size of extended
status
Length of the extended device status in bytes. The extended device
status can be up to 16 longwords of information. The extended
status displays when the user enters the SHOW ERRORS command
at the console prompt.
Pointer to
extended
configuration
Points to extended configuration information about the device. For
example, the SCSI self-test code uses this field to save a pointer
to information about the devices connected to the SCSI bus. The
information is displayed when the user enters the SHOW CONFIG
command at the console prompt.
Pointer to
permanent
memory
Points to the permanent memory that has been allocated. The field
is filled in by the diagnostic, the first time that it allocates memory.
Continued on next page
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