Switching the views of the 3270 terminal device driver

The 3270 terminal device driver provides three different views.

Use function key 3 (PF3) to switch between the views (see Figure 1).
Figure 1. Switching views of the 3270 terminal device driver
This graphic is a visual summary of the preceding text.

The Linux kernel messages view is available only if the terminal device is activated for Linux kernel messages. The full-screen application view is available only if there is an application that uses this view, for example, the ned editor.

Be aware that the 3270 terminal provides only limited full-screen support. The full-screen application view of the 3270 terminal is not intended for applications that require vt220 capabilities. The application itself must create the 3270 data stream.

For the Linux kernel messages view and the terminal I/O view, you can use the PF7 key to scroll backward and the PF8 key to scroll forward. The scroll buffers are fixed at four pages (16 KB) for the Linux kernel messages view and five pages (20 KB) for the terminal I/O view. When the buffer is full and more terminal data needs to be printed, the oldest lines are removed until there is enough room. The number of lines in the history, therefore, vary. Scrolling in the full-screen application view depends on the application.

You cannot issue z/VM® CP commands from any of the three views that are provided by the 3270 terminal device driver. If you want to issue CP commands, use the PA1 key to switch to the CP READ mode.