When printing a full page of text in Diablo emulation on a LaserWriter Plus,
the top and bottom line of the text may be cut in half, or there may be a
similar problem.
In order to get maximum lines per page in Diablo mode, reduce the lines per
page (or lines per inch) setting. There is no other workaround for this
situation. The margins set in Diablo mode are the print engine's margins and
cannot be reset.
For a long time, there's been a known bug in Diablo mode that causes margins
to be wrong sometimes. There has been no fix for it because the problem
cannot be found.
Some users may think that when Apple upgraded the LaserWriter and reduced the
printable area, Apple neglected to test the Diablo emulation. This
misconception needs to be cleared up. There's no difference in the margins
between a LaserWriter and a LaserWriter Plus in Diablo 630 Emulation Mode.
The increased margins come into play only when the printer is being driven by
a LaserWriter driver and is using the Laser Prep file that is downloaded from
the Macintosh.