https://ia803003.us.archive.org/12/items/IBMHardwareManualsAndService/tr2003us.pdf
Page 9
Note1: SCSI-2 Fast/Wide Streaming RAID Adapter/A
There are 3 connectors on adapter: one external and two internal.
One internal is the opposite end of the external and can only be used if external is not used (this is first SCSI bus which has 2 connectors).
The other internal can go to internal devices or go to the standard
sidecard (this is second SCSI bus which has 1 connector).
The sidecard ships standard and uses a Micro Channel slot. It is only
used if want external devices on this bus (sidecard does not ship on PC
Server 500 array models).
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