Xerox 701P21091 Block Postamble parameter points to note, Block Preamble, Block Zero, Default no

Specifying input parameters

BLOCK POSTAMBLE parameter: points to note

•If the block delimiter string constant is specified, the block postamble is ignored.

•The POSTAMBLE parameter may be overridden if RECORD STRUCTURE is changed through tape label processing.

BLOCK PREAMBLE

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.

Syntax BLOCK PREAMBLE = length

Options

Table 2-13. BLOCK PREAMBLE parameter options and definitions

Option	Definition
length	An integer in the range of 0 to the block length that specifies the number of
	bytes from the first byte of the tape block to the first byte of the first logical
	record

Default 0

BLOCK ZERO

Specifies the End-of-block indicator.

Syntax BLOCK ZERO = {NO YES}

Options

Table 2-14. BLOCK ZERO parameter options and definitions

Option	Definition
YES	Specifies that the end of a tape block is indicated by a value of 0 in the record
	length field (before applying the record length adjustment). Data that follows the
	record is ignored through the end of the block.
NO	Indicates that the end of a tape block is not indicated by a value of 0 in the
	record length field.

Default NO

Using LCDS Print Description Language 2-17