EXTERNAL SCSI DISK      DB25 FEMALE (A3000 ONLY)
------------------------------------------------

   1       REQ             14      GROUND
   2       MSG*            15      C/D
   3       I/O             16      GROUND
   4       RST*            17      ATN*
   5       ACK*            18      GROUND
   6       BSY*            19      SEL*
   7       GROUND          20      PARITY
   8       DATA0           21      DATA1
   9       GROUND          22      DATA2
   10      DATA3           23      DATA4
   11      DATA5           24      GROUND
   12      DATA6           25      TERMINATION POWER
   13      DATA7

See the ANSI (American National Standard Institute ) standard SCSI (Small
Computer Standard Interface) Specification for more information.