## 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: 

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). 

To define 3270-X devices to an OSCONFIG, complete the following steps: 

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 | +-----------------------------------------------------------------------------+ 

