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Special Offset from TOF
2-24
UM:rs Manual
Explanation
of
the Special Offset from TOF
The special offset from TOF feature is used mainly with preprinted
forms. Certain application programs immediately start printing data
on the first form with no consideration for where the form is
positioned. In the past. the person loading paper was responsible
for positioning the form so that the first printed line fell in the
correct place on the form (perforation 2. 5 inches above the notches
in the upper tractors for the green forms. I inch above the notches
for paychecks, etc. ).
Using the special offset from the top of form allows you to load
all
forms and paper with the perforation at the notches.
Since the host program knows the distance between perforations. it
will print the first form and then move the paper to the same
position on the next form. This will continue through the box of
forms to be printed.
The offset is used to position the string of forms to the first print
line on the first form. The host, knowing the length of the form, is
then responsible for advancing the paper to the next form's first
print line.
Example: To print standard data listings, the operator selects an
11-inch form (Form
7)
at 6 lpi, with no top or bottom margins.
The date, which is the first printed data on each page, is supposed
to land 1 inch from the top of the form (perforation). TOF has
been set with the perforation at the notches of the upper tractors.
When the application program starts. the date is printed on the
first line of the form, not 1 inch from the perforation. The program
prints the first page and advances the forms to the second page.
The second page is also printed with the date at the perforation.
This cannot be compensated for with a top margin. since a margin
affects every form. A top margin would effectively add to th.e space
that the host uses to go from form to form.
In the following illustrations, the application program knows to print
54 lines of data (9 inches at 6 lpi) and then advance the paper 12
lines (2 inches at 6 lpi) before printing the next form. This will
continue until the print Job is finished.
Paper in both examples
was
loaded with the perforation at the
notches of the upper tractors.
Nm• 93
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