User's Manual

IBM DOS/360 POWER II TAPE ORGANIZATION
4-2 XEROX LASER PRINTING SYSTEMS TAPE FORMATS MANUAL
• The 20-byte header label contains the characters
PRTRDRPUN in the first 9 positions followed by 11 blanks.
(This is the same as Version 4.0.)
• Each block begins with a 6-byte block prefix which contains the
block length in bytes in the last 2 bytes of the prefix. (This is the
same as Version 4.0.)
• Each record is prefaced with a 2-byte field. The first byte is the
length of the data portion of the record in bytes, and the second
byte is an IBM 1403 Machine Control Code used for carriage
control.
Version 4.1
The block Version 4.1 is shown in figure 4-2.
Figure 4-2. POWER Version 4.1 and 4.2, block format
• The 20-byte header label contains the characters
PRTRDRPUN in the first 9 positions followed by 11 blanks.
(This is the same as Version 4.0.)
• Each block begins with a 6-byte block prefix which contains the
block length in bytes in the last 2 bytes of the prefix. (This is the
same as Version 4.0.)
• Each record is prefaced with a 3-byte field. The first two bytes
contain the length of the data portion of the record in bytes, and
the third byte is an IBM 1403 Machine Control Code used for
carriage control.
Version 4.2
The block and record format for Version 4.2 is identical to Version
4.1. (Refer to previous section.)