User's Manual

UNDEFINED TAPES
14-2 XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL
errors (timeout, unreadable block, etc.) do not occur until the
operator starts processing on the nonexistent file.
• A double tape mark termination leaves the tape positioned after
the second tape mark.
• An EOT coincident with a tape mark causes multi-reel
processing to occur.
Some samples of file structure that may be processed by specifying
undefined Host and undefined labels are shown in figure 14-1.
Figure 14-1. Undefined labeled tape structures
Data format
Any data format that is describable by the BLOCK and RECORD
commands can be processed. The parameters in the JDE take
precedence and control deblocking of data. The LINE command
controls printer carriage control and other print controls. The user
should note that any data block of the same length as a label is
treated as a label.
Key TM Tape mark
Triangles are assumed file breaks