IBM System/370 Manual page 162

Printer DD statement included for the job step and will
be
loaded into
the FeB by the control program.
The FeB image currently loaded can also be changed
by
the programmer
during execution of the processing program
by
use of an Assembler
Language macro. If the DD statement does not specify an FCB image
and the image currently loaded is not one of the defaults specified
at system generation., the operator is requested to specify the FeB
image to be used.
The FCB image (and the UCS character image) to
be
loaded for a 3211
Printer used by an output writer can be indicated in the output writer
procedure or in the START output writer command issued by the operator.
FCB and UCB images can also be specified in the SYSOUT DD statement
for a data set that is to be printed by the output writer, and they
will be loaded into the 3811 control unit prior to the printing of
the data set.
Any time the FeB parameter is used, as described above, the user
can specify that operator verification of forms alignment is to be
requested by the control program via a console message when the buffer
is loaded. The operator must respond to this message.
The 3211 error recovery routine will retry a print operation after
a parity check occurs in the UCB or print line buffer if QSAM is used
and if three I/O buffers are provided for the printer data set. When
the operation is retried, the 3811 control unit insures that only the
print positions that did not print correctly the first time are
reprinted.
Operator console. The alphameric keyboard and CRT will be supported
as the primary operating system console. The multiple console support
(MCS) and device-independent display operator console (DIDOCS) options
of OS must be included in the operating system to support this console.
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