IBM 1725 SLS - Manual (Page 71)

Emulations
2-37 Printer Configuration
Reverse Image
Determines whether an image is printed in reverse.
Enhanced Mode
Increases the resolution of a downloaded character.
Expand Mode
Defines a larger imageable area for the selected media type. This
increased imageable area affects the default placement of the scaling
points P1 and P2.
Menu Administration/Emulations/HPGL/Reverse Image
Choices On—Print a white image on a black background.
Off—Print a black image on a white background.
Default Off
Menu Administration/Emulations/HPGL/Enhanced Mode
Choices On—Uses an increased resolution for the grid
Off—Uses standard resolution for the grid
Default Off
Notes The HP-GL user-defined character (UC) command
downloads and draws characters with an encoding scheme
that uses pen control movements and coordinate sequences.
The characters are drawn on a grid that is superimposed on
the character plot cell.
Menu Administration/Emulations/HPGL/Expand Mode
Choices On—Expands the imageable area.
Off—Doesn’t expand the imageable area.
Default Off