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SPECIFYING INPUT PARAMETERS
XEROX DOCUPRINT 180 LPS PDL REFERENCE 4-59
Forms control buffer (FCB)
The 3211/4245 forms control buffer (FCB) defines channel positions
and forms length. Online users may restrict the forms control buffer
information by accepting or suppressing the normal processing of
host-transmitted FCB input. This can be accomplished by the
FCB=IGNORE parameter of the LINE command.
Vertical format control processing
The interaction of the vertical format controls in the JSL and the FCB
sent from the host is as follows:
• When a START command is entered, the VFU table and its
associated BOF in the JDE come into effect.
• If no VFU is specified in the JDE, the last FCB sent from the
host is retrieved from the disk and becomes active.
• If no BOF is specified in the JDE, the length of the last FCB sent
from the host is retrieved from the disk and becomes BOF. Note
that TOF is not affected by the FCB.
• If FCB=PROCESS and an FCB is sent from the host, it
overrides the previous FCB or VFU. Its length replaces the
previous BOF. Furthermore, its contents and length are saved
on the disk.
• When a DJDE is used to change a channel assignment, any
previous assignments to the channel being changed are
suspended until the end of report. At the end of report, DJDE
changes are discarded and the last active FCB or VFU comes
back into effect.
• When sysgen is executed, the FCB saved on disk is reinitialized
to the length of 66 lines with the following channel assignments:
Channel 1 2 3 4 5 6 7 8 10 11 12 9
Line 4 10 16 22 28 34 40 46 52 58 64 66
The default corresponds to the STD2 default supplied by IBM.
• If a print-and-skip-to-channel command is sent for an undefined
channel, the LPS executes a print-and-space-one command.
• If FCB=PROCESS, an FCB load causes positioning to TOF. If
the system is already at TOF, page eject is suppressed. If the
line number prior to the FCB load is greater than TOF, a page
eject occurs.
• The print position indexing (PPI) byte of the FCB is not
suppressed by FCB=IGNORE. If an FCB with a PPI byte is
received, indexing is invoked; if an FCB without a PPI byte is
received, indexing is turned off (even if FCB=IGNORE). Use of
the PPI byte to shift the starting print position may cause
problems in recognition of both DJDEs and banner pages.