Oce DJDE, Reference Manual

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Summary of BLOCK Command Parameters Input Processing
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2.2 Summary of BLOCK Command Parameters
ADJUST This parameter specifies a block adjustment value which is added to or
subtracted from the contents of the block length field to determine the true
block length.
CONSTANT This parameter specifies that the block delimiter constant sc and all data
following it are ignored until the end of the block is reached.
FORMAT This parameter specifies the recording mode of the block length field.
LENGTH This parameter specifies the longest physical block being processed.
LMULT This parameter specifies a multiplication factor being applied to the con-
tents of the block length field to determine the true block length.
LTHFIELD This parameter specifies the length of the field containing the block length.
OFFSET This parameter specifies the location of the block length field.
POSTAMBLE This parameter specifies the length in bytes of the extraneous data at the
end of each tape block; that is, it is an offset from the end of a block back-
wards to the end of the last logical record.
PREAMBLE This parameter specifies the length of the operating system portion of the
block, that is, the byte offset from the first byte of a tape block to the first
byte of the first logical record.
ZERO This parameter specifies the end of block indicator.