How can I get more space on the screen?
Refer to your video card documentation
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Look to your video card documentation for anything that references a video
mode that supports up to 132 columns and more than 25 rows - 60 rows is
ideal.

Convert the mode number to decimal and enter the number into the Screen Mode
Change item of the Display sub-menu of the options menu, save the settings,
quit the program and re-run it. The program will automatically change to
that video mode.