If you're not using a Unix system, different locations would be advisable. Most of the options that can go in a configuration file can also go on the command line. Without further ado, here are all the options available. Unless otherwise stated they can be used either in config files or on the command line. The point is that most printers have a usable area that doesn't extend right to the edges.
All dimensions are in points.
The aspect ratio is given as a percentage, and really isn't exactly an aspect ratio. For instance, 5-point Courier type has characters 3 points wide, so is 0.6. You can make lines closer together or further apart by decreasing or increasing . I do not guarantee that this will work, but it does work on the PostScript devices to which I have access. The gaps around the edge of the text are all in size.