Bull DPS 7000 Operator's Manual page 784

GCOS 7 System Operator's Guide
Foreign controller
Device type: FC
(Transparent peripheral controller attached to PSI-2.)
Device class: FC/M1
Foreign device
Device type: FD
(Transparent peripheral device.)
Line
Device type: LN
Logical terminator
Device type: LT
Mass storage controller
Device type: MC
Device classes:
MC [ / { M1 | M5 } ]
where:
M1
M5
Maintenance feature
Device type: MF
F-2
is for MS/B10 and MS/D500 disks
is for MS/FSA disks
47 A2 53US Rev03