DJA7:         DSK7:      SYSTEM 
DJA19:        DSK19:     PAGE & SWAP
DUA0:         DSK0:      SYSTEM
DUA1:         DSK1:      OPERATOR, SUPPORT
DUA2:         DSK2:      DIRECTORIES
DUA3:         DSK3:      DIRECTORIES
DUA4:         DSK4:      DIRECTORIES
DUA5:         DSK5:      ADA, DRS
DUA6:         DSK6:      DRS
DUA8:         DSK8:      DEMO
DUA9:         DSK9:      RESERVED
DUA10:        DSK10:     RESERVED
DUA11:        DSK11:     RESERVED
DUA12:        DSK12:     RESERVED
DUA13:        DSK13:     SCRATCH