IBM 6400 Setup Manual page 280

The IBM 6400 does not support compatibility with the Printronix P1013 or the
P4160.
Printronix printers with the following interfaces are not supported: S/370
Channel Attachment (Printronix P9012), QMS** 2780 or 3780
Bisync–to–ASCII attachment, RS–232 as Current Loop, and Dataproducts Long
Lines.
Limitations
Forms length maximum of 24 inches. In the cabinet models, forms
longer than 12 inches can be accommodated by opening the front and
rear doors.
Maximum forms width of 17 inches (including tear strips) or 16 inches
(without tear strips).
Use 15 to 100 pound (6.8 to 45.36 kg) stock with a maximum thickness
of 0.025 inches (0.0635 cm).
Maximum print line of 13.6 inches.
Friction feed paper handling is not supported.
Use of high speed (Draft mode) fonts using greater than 15 CPI for
critical applications should be tested, prior to production use, using your
application to determine if the output is satisfactory.
Processing of forms with black or dark colored backing, or forms with
see–through plastic or cellophane covered openings or windows may
give false End–of–Forms (EOF) signals. Request For Price Quote (RPQ)
S02392 (factory–installed) or S02394 (field–installed) may be ordered to
provide a modified EOF switch to handle these types of forms. Contact
your IBM Sales Representative or IBM Authorized Remarketer.
Downloaded characters are not supported in Proprinter, Epson, P–Series,
P–Series XQ Variant, or Printronix Serial Matrix emulations.
Due to the variation in carbonless forms, you should test forms with four
or more parts for readability prior to production use. Carbonless forms
can be affected by storage and other environmental conditions and
should be tested periodically from your application to make sure the
output meets your requirements.
Compatibility differences may exist when replacing or coexisting with
older printers due to technology differences, product and application
customization, and emulation differences.
C–6 6400 Line Matrix Printers Setup Guide, Cabinet and Pedestal Models