LSI 21003 - Manual (Page 49)

Operational Environment 3-7
3.2.2 The SCSI Interface
The SCSI interface conforms to ANSI X3T10.11/1142.
The SCSI interface operates as two 16-bit, SE or LVD channels, and
supports Fast, Ultra, Ultra2, and Ultra160 SCSI protocols. The interface
is made through connectors J2, J3, and J4 for Channel A and J5 for
Channel B.
J2 is a 68-pin high density right-angle connector for internal SCSI
connections to Channel A. J3 is a 50-pin high density right-angle
connector that protrudes through the ISA/EISA bracket for external
connections to Channel A. Also on Channel A is connector J4, which is
a 50-pin narrow (ribbon) connector for internal connections. Channel A
has autosensing, active SE SCSI termination.
J5 is a 68-pin high density latching right-angle connector for internal
SCSI connections to Channel B. Channel B has active, SE or LVD SCSI
termination that is always enabled.
SCSI TERMPWR is supplied by the board.
Tables 3.4 , 3.5 , 3.6 , and 3.7 document the signal assignments for J2, J3,
J4 and J5 respectively.