13.2.3 Defining 3270-X devices to an OSCONFIG The OSCONFIG name is the part of an IODF that determines what devices a z/OS system  can access when it IPLs. The partition that the z/OS system is restarted in also must access  the CHPIDs that connect to the Control Units and Devices that match in the OSCONFIG. The OSCONFIG also contains Esoterics device groups, which are defined in EDTs within an  OSCONFIG. OSA definitions often do not use Esoterics. Consider the following points for adding devices to an OSCONFIG: To define 3270-X devices to an OSCONFIG, complete the following steps: GLYPH<SM590000> Adding a device to an OSCONFIG does not necessarily mean that the z/OS system can  access that device. GLYPH<SM590000> In our example, we add the predefined OSC devices 0800-080F (3270-X). 1. From the main HCD panel, select option 1.5. I/O Devices . 2. Scroll through the I/O Device List until you find the device number that you want to add to  the OSCONFIG or in the command line, enter  L 0800 . In our example, we use  1B10 . 3. Enter  c  next to one or more Device numbers, and press Enter. 4. HCD displays the Change Device Definition panel where you can modify the Control Unit  that the devices are attached to (see Figure 13-8). Press Enter. +------------------------- Change Device Definition --------------------------+ | | | | | Specify or revise the following values. | | | | Device number . . . . . . . :  0800  (0000 - FFFF)  | | Number of devices . . . . . : 16 | | Device type . . . . . . . . : 3270-X | | | | Serial number . . . . . . . . __________ + | | Description . . . . . . . . . ________________________________ | | | | Volume serial number . . . . . ______ + (for DASD) | | | | PPRC usage . . . . . . . . . . _ + (for DASD) | | | | Connected to CUs . 1B00 ____ ____ ____ ____ ____ ____ ____ + | | | | ENTER to continue. | | | | F1=Help F2=Split F3=Exit F4=Prompt F5=Reset F9=Swap | | F12=Cancel | +-----------------------------------------------------------------------------+ Figure 13-8 I/O Devices: Change Device Definition, OSC 300  IBM z14 Model ZR1 Configuration Setup