HP 2566C - Manual (Page 46)

Forms length is the amount of text lines your printer can print per page.
It can be set two ways: | inch increments or text lines-per-page. Both
methods are explained below. If you are setting forms length for the
first time, or changing forms length to a new paper size, follow these
instructions.
If you do not need to adjust the forms length, continue to the next
section, “Adjusting Top of Form,” on page 3-30.
Figure 3-25 defines areas on the form you need to consider when setting
forms length.
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igure 3-25. P?rts oi the Form
PREPARING THE PRINTER FOR OPERATION 3-25