Olivetti D-COLOR P26 - Manual (Page 74)

Colour matching> 74
Since this feature prints on both sides of the page, it requires a
duplex unit to be installed in the printer, and 256MB of additional
memory (512MB in total).
When using the PostScript driver, if you plan to print a long
document, more than about 16 pages, consider printing it in
sections of 8 or 16 at a time. This is called the “signature,” and
will avoid having too thick a stack of paper to fold to make your
booklet. Your document will then be printed in a series of
booklets which can be stacked one above the other. This is
usually a neater arrangement.
The above considerations do not matter when using the PCL
driver as the signature can be set within the driver, and a long
document can be printed directly as a series of booklets.
Note that the number of pages in a booklet is always a multiple
of four, since two pages are printed on each side of each sheet of
paper. If your document is not a multiple of four pages long, the
last one, two or three pages in your folded booklet will be blank.
NOTES:
1. To find out how much memory currently installed, print
out a Configuration page from the printer control panel.
2. A few applications do not support booklet printing, but
most do.
3. This feature is not available in the Macintosh drivers.