Pentax 3 User Manual page 38

For standard paper sizes, this setting determines default
margins and expected length for each printed page. For
'Custom' sizes, margins and length may be set using the
commands 'Form Length', 'Bottom Margin', 'Left Margin' and
'Right Margin'.
'Letter' size assumes an 8-1/2 x 11" page, and sets a total
printable height of 10.67", which in turn provides for a top
margin of about 0.27", and a bottom margin of about 0.06".
Printable width is set to 8.16" with 0.17" margins on either
side.
'Legal' size assumes an 8-1/2 x 14" page, and sets a total
printable height of 13.67", and top and bottom margins of
about 0.27" and 0.06", respectively. Printable width is set to
8.16" with 0.17" margins on either side.
'A4' size assumes an 8.27 x 11.7" (210 x 297mm) page, sets a total
printable height of 11.36" (288.5mm), top and bottom margins
of about 0.27" (6.9mm) and 0.06" (1.5mm) respectively.
Printable width is set to 8.0" (203.2mm) with 0.13" (3.3mm)
margins on either side.
'Custom' size allows the setting of length of the form, bottom
margin, and left and right margins using those commands.
A Note about Text Mode:
The PocketJet 3 and 3 Plus printers can print either Raster
Graphics or Text Mode. The choice is determined
automatically by the data stream sent from the host device to
the printer.
Raster Graphics is the most common form of usage for the
PocketJet. The printer uses bit-mapped graphics as opposed to
text. What you will see is WYSIWYG – what you see is what
you get – meaning that what is on your computer screen is
what is printed.
In Text Mode, the PocketJet will print only the characters
contained in the resident character set. For the PocketJet 3 and
PocketJet 3 Plus, this character set is the Epson® ESC/P
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