Program Settings → Scrollback

In this group of options you can specify the maximum number of lines which the program will store for scrolling back. Very large numbers may consume a lot of memory and will come with a slight performance penalty.

There is also an option to include alternate screens in scrollback. Linux programs like VI, Midnight Commander write to an alternate screen buffer and their data normally clutters the scrollback. The notable exception to such programs is a tool called screen. If you are using screen, you may want to enable this option to get the output from screen included in the scrollback.

Some hosts/programs clear the screen using a series of commands that delete single lines. If you want these to be included in the scrollback, check the corresponding option. However, if you find the scrollback cluttered with single lines that appear there out of sequence, you may want to disable the option.

From ZOC's menu you can either view the scroll back contents within the main window (via Shift+PageUp) or within an extra window (via Alt+PageUp). For the latter function (scrollback in window) you can also select a font.

The data stream buffer logs incoming data exactly in the order it is received to a memory buffer and it has a viewer that displays the data that way. The data stream viewer can also show data in debug mode (see Session Profile→Trace/Debug). The size of this buffer can be configured in this dialog.

The window for the data stream viewer will use the same font as specified above for the scrollback viewer window.