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5.4.1 Loading from the mainframe to the FCB
The forms feed information must be loaded in the FCB before
froms
feed, except
when an LF, FF, or CR control code is specified.
The data loaded in the FCB is used for forms feed control by the VT or FF code
or
the FCB command transferred just after the print data.
Following to the start code
(X'lD'),
the forms feed data is sent in Z-byte
units for every line and is terminated by the stop code
(X'lE').
Figure 6.10
shows an example of loading the data in the FCB.
The channel data for the first line consists of 2 bytes
,just
after the start
code.
Data for the second line is the next 2 bytes.
Data for a maximum of 176
lines can be loaded in the FCB (356 bytes).
The TOF (channel
1)
is set just
after the start code and also 2 bytes just before the stop code.
If the number
of bytes loaded is odd or exceeds 356 bytes,
the Fault signal is set to 1 and
the STATUS indicator shows the error contents.
If the TOF code is issued in the middle of the FCB data stream, the TOF code is
ignored until the stop code is issued.
Figure 5.10 Loading the data in the FCB
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