User's Manual

XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL 8-1
8. 8Medium Burroughs system
tapes
The Xerox/OSS accepts two basic tape formats from the Medium
Burroughs systems (B2500, B2700, B3500, B3700, and B4700
computers): printer backup and non-printer backup ANSI. The
features which distinguish printer backup tapes are:
• “BACKUP” in the label field
• Block length is 136 words (6 characters per word)
• Record structure is FB
• Carriage control is a 4-byte field.
Figure 8-1. Format of the Burroughs standard label for a
printer backup tape
Record format
The record structure is “FB” for blocked, fixed length records. The
block has no header, length indicator, or postamble; it may be
truncated to less than maximum block size, but always contains a
number of bytes equal to an exact multiple of the record length.