System Control Blocks

Offset
o (0) 4
+0 8
+8
+8 4
+8 2
Bytes and Field
Alignment Name
+10 • • 1 xxxx xx ••
+11 • • • 1
•••• •• 00
DE.VICE NAME TABLE
Field Description, Contents, Meaning
Number of entries.
The number of 12 byte entries in the table. Each
device name has one entry.
THE FOLLOWING 12 BYTE FIELD IS REPEATED FOR EACH
DEVICE
Device name.
A device name which is in one of two classes:
generic or user assigned. The name is left justified
and padded with blanks to the right.
Generic name:
IBM generated' name up to 8 characters in length.
Examples:
2400 (2400 series 9-track Magnetic Tape Drive)
2311 (disk drive)-
User assigned name:
User assigned name up to 8 characters in length.
Examples:
M.l\G'1'APE
Device type.
Generic name:
The contents of the field are the same as those of
the UCBTYP field in the UCB except that optional
features are not indicated: byte 2 contains zeros.
User assigned name:
A digit one higher than the digit for the preceding
user assigned name. The first entry for a user
assigned name will contain a 1 in this field.
If one device is associated with the device name,
these bits will be the same as bits 0-5 of the device
class field (byte 3) of the UCBTYF field. If more
than one device is associated with the name, these
bits will indicate the result of ORing the device
class field of the UCBTYP field for each device •
Always zero.
Zero.
DNT 163