Example: Record format *DB

This is an example of record format *DB, which consists of a graphic with an explanation.

D-type code ASCII, blocked (*DB).

Figure 1. Records with optional block prefixes
This graphic displays two
blocks. Block 1 contains OBP, Record A, Record B, and Record C. Block 2 contains
OBP, Record D, Record E, and Record F. Block 1 is also pointing toward Block
2.

This graphic displays two
blocks. Block 1 contains OBP, Record A, Record B, and Record C. Block 2 contains
OBP, Record D, Record E, and Record F. Block 1 is also pointing toward Block
2.

OBP is an optional block prefix. The buffer offset (BUFOFSET) parameter, for the tape file, specifies the optional block prefix that can vary in length from 00 to 99. The OBP length must be constant for all blocks in the file. Each record can also contain an optional control character.