User's Manual

HONEYWELL TAPES
10-16 XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL
Honeywell 600/6000 data formats
This section describes the data formats for the Honeywell 600/6000.
Variable length record format, Honeywell 6000 standard system tapes
Variable length records are limited to those files recorded in the
binary mode (refer to figure 10-8).
Figure 10-8. Honeywell 600/6000 variable length record format
The Block Control Word (BCW) exists as the first word of each
physical tape block. It is structured as shown in table 10-13.
Table 10-12. Standard partial basic tape label (Honeywell 600/
6000 standard system format labeled tapes)
Name
Character
position(s)
Description
Label identifier 1-12 This is a 12-character identifier: GEbb600bBTLb.
Installation identification 13-18 This is constant information for a given user installation.
Volume serial number 19-24 This is the serial number of the physical tape reel.
Zeros* 26-60 Must be all zeros.
Reserved 61-84 Unspecified contents.
*Checked by the operating system.
Key BCW
RCW
Block Control Word
Record Control Word
Table 10-13. Honeywell 600/6000 block control word format
Character
position(s)
Bits Description
1-3 0-17 Block serial number is the sequential number of this physical block.
4-6 18-35 Block size is the size of the block in words of (6 characters/word), not including this
block control word BCW (octal).