Superimposition - Xerox 4850 Reference

FORMS LAYOUT CONSIDERATIONS
Landscape pages

Superimposition

5-4
• Each active character is at least one dispatchable item. (An
active character includes all the space from the top of the
character cell to the bottom of the character cell, even if
there is only white space present on a given scan line.) If the
dimension along the scan line is greater than 32 dots, the
character consists of some multiple dispatchable items.
It is not possible to construct a form with two adjacent lines if
both use the full count of 318 (320 minus the two required for
overhead) dispatchable items resulting from text and lines. The
imaging system requires a rest period of about four scan lines
before it can image the second fully loaded line.
Line density restrictions differ as a function of the mode
(landscape or portrait) of the form. An 8-point or smaller
landscape font is smaller than 32 dots for 300 spi. A vertical line
is a single dispatchable item. A horizontal line is treated as a
series of 32 dots in length, joined end-to-end.
For 300 spi, this means that a form using an 8-point or smaller
font on a landscape page may have up to 318 characters (plus a
two-item overhead, resulting in 320 dispatchable items) on a
scan line. When using a 6-point font, it is possible to have, for
example, 132 characters, a line across the page under the text,
and up to 90 vertical lines, without exceeding the line density
limitations.
If a form requires a 9-point or larger font, the number of
characters that may be imaged on a landscape page is reduced to
160 because the characters are generally more than 32 dots
wide. While the dispatchable item count remains 320 per line,
fonts 9 points and larger use two dispatchable items per
character. Since a character in a large font constitutes two
dispatchable items, only half as many characters in a large font
may be imaged on a scan line as is possible with a smaller font.
Portrait pages Restrictions for a portrait page are significantly different from
those for a landscape page because the system always images in
a landscape direction. Therefore, if a page is formatted in
portrait orientation, the hardware must reorganize the data into
landscape prior to imaging.
On a 300-spi portrait page, a 12-point font drops the
dispatchable-item count below the 320-character level. A form
with a 12-point font may have not more than 160 characters on a
scan line.
When using an 8-point 300-spi font on a portrait page, the
maximum dispatchable-item count permitted is approximately
200 per scan line. This limit falls off gradually to 170 characters
for a 6-point font, 150 characters for a 5-point font, and 120
characters for a 4-point font.
Since lines superimposed over each other count as double the
dispatchable items of a single line, they detract from the system
capabilities.
XEROX 4850/4890 HIGHLIGHT COLOR LPS FORMS CREATION REFERENCE