Tally T5023+ Programming Manual page 197

Additional commands (Printer) Important notes on document processing
Absolute vertical positioning (bottom reference):
n 1 is admissible; n = 0 causes an error message.
Selection of the vertical leading edge
For performance reasons, care should be taken that the text lines are processed
from top to bottom when processing documents on which the lines relate to the
top of the document (top reference). With top reference, the preferred direction
of the printer is the forwards movement (insertion direction). With forms desi-
gned with bottom reference, the preferred direction is the backwards movement
(eject direction), so that here processing should be from the bottom to the top.
The user is free to change from bottom reference to top reference within a form.
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T5023/5023+ - Programming Guide