IBM 2104 Model DU3 - Manual (Page 70)

One Adapter in One Using System Connected to Two 2104s via the
SCSI Interface Cards
1 SCSI interface card
2 SCSI adapter. This configuration is not valid for any type of adapter.
2104 Subsystem
1 1
Using System
2
1 1
2104 Subsystem
X
Figure 39. One Adapter in One Using System Connected to Two 2104s via the SCSI
Interface Cards. This configuration is not valid.
54 2104 Model DU3 Installation Guide