6. Update  Channel path IDs  to  B8  (channel path ID B8 is the CHPID that we defined in the  previous example) to define the Processor / CU connection (see Figure 13-24). Press  Enter. *---------------------- Change Control Unit Definition -----------------------* | | | | | Specify or revise the following values. | | | | Control unit number . : 1B80 Type . . . . . . : OSA | | Processor ID . . . . . : MUSCA Musca | | Channel Subsystem ID . : 1 | | | | Channel path IDs . . . .  B8 __ __ __ __ __ __ __ + | | Link address . . . . . . ____ ____ ____ ____ ____ ____ ____ ____ + | | | | Unit address . . . . . . 00 __ __ __ __ __ __ __ + | | Number of units . . . . 255 ___ ___ ___ ___ ___ ___ ___ | | | | Logical address . . . . __ + (same as CUADD) | | | | Protocol . . . . . . . . __ + (D, S or S4) | | I/O concurrency level . _ + (1, 2 or 3) | | | | | | | *-----------------------------------------------------------------------------* Figure 13-24 Control units: Change Control Unit Definition detail, OSD 7. HCD now shows the Modify Device Parameters panel where you can override the Unit  Address (UA) numbers. For most OSA definitions, the Unit address starts at  00 . 312  IBM z14 Model ZR1 Configuration Setup