The following is based on the example device dkb1.2.3.4.5 taken from a Digital Server 3300 (Whitebox version of
an AS800).
Two letter port or class driver designator:
DR: RAID set device
DV: Floppy Drive
EW: Ethernet port (TULIP, DEC 21040)
EI: Ethernet port (Intel 82557 or 82559)
PK: SCSI port (controller)
DK: SCSI disk
MK: SCSI tape
PU: DSSI port
DU: DSSI disk
MU: DSSI tape
JK: SCSI monitor (or robot)
DQ: (E)IDE Device (disk or CD-ROM)