This box sets the number of lines on the display, not including the status
line. This defines the display size, and the host can position and write characters
anywhere within this area. The maximum number of rows you can enter depends
on the display resolution; the higher the screen resolution your video adapter
provides, the more rows you can fit on the screen.
When you change the number of rows, characters are scaled vertically to fit the desired number of rows, or lines, in the Terminal window. The display is erased (all of display memory is cleared) before the new setting takes effect.
This setting reflects the current terminal state of VT Page Size, which can
be changed by the host. The associated default setting, saved with the model,
is VT Page Size Default.