Single-Ended and Differential Disk Drives

    Addr Jmp3  Jmp2  Jmp1  Jmp0
   _____________________________           3 2 1 0
  |  0  | Off | Off | Off | Off |         __________________________________
  |  1  | Off | Off | Off | On  | Pin 1----o o o o   o o o o o o X o o o o  |
  |  2  | Off | Off | On  | Off | Pin 2----o o o o o o o o o o o X o o o o  |
  |  3  | Off | Off | On  | On  |        |__________________________________|
  |  4  | Off | On  | Off | Off |            Pin 1 and Pin 2 do not exist
  |  5  | Off | On  | Off | On  |            in the 50pin model.
  |  6* | Off | On  | On  | Off |
  |  7* | Off | On  | On  | On  |
  |  8  | On  | Off | Off | Off |  ______________________________
  |  9  | On  | Off | Off | On  | |* Addr 7 is usually reserved  |
  | 10  | On  | Off | On  | Off | |  for the adaptor.            |
  | 11  | On  | Off | On  | On  | |  In high-availability        |
  | 12  | On  | On  | Off | Off | |  configurations, the second  |
  | 13  | On  | On  | Off | On  | |  adapter is usually assigned |
  | 14  | On  | On  | On  | Off | |  address 6.                  |
  | 15  | On  | On  | On  | On  | |                              |
  |_____|_____|_____|_____|_____| |______________________________|


                Label           VPD
9.1GB           IBM DCHS09W     IBM DCHS09W             Scorpion
                FRU 93G2972     Ref 93G2972             SCSIFW SE
                P/N 93G2863     FRU 74G6985

                SCSI ID weight   8 4 2 1
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