LSI 21003 - Manual (Page 34)

2-18 Installing the LSI21003
2.2.4.2 Internal SCSI Connections for Both Internal Connectors
If internal SCSI device connections to both internal connectors (J2 and
J4) on your host adapter have been made, then terminate the internal
devices on each end of the SCSI bus. You must disable the termination
on all other devices. Termination on Channel A of your host adapter is
automatically disabled in this case. Remember, you must not use the
external connector J3 if you use both internal connectors.
Figure 2.13 shows an example of how termination is determined for this
SCSI bus configuration.
Figure 2.13 Internal and Internal SCSI Device Termination
2.2.4.3 External SCSI Connections
If only external SCSI device connections to the host adapter have been
made, then terminate the last external device on the SCSI bus. You must
disable the termination on all other devices. Termination on the host
adapter is automatically enabled for Channel A.
Does Not
End Chain–
Termination
Disabled
Last Devices
on Chain–
Termination
Enabled
Note: Host Adapter Termination
Automatically Disabled