Owner`s manual

3.4.2 Host Density Selection
Selecting the operating density through the interface is a function of the
host system software and the interface itself.
3.4.3 Automatic Density Selection
The TSZ07 automatically selects the operating density when it reads
an identification burst from a tape. When a load is completed with the
TSZ07 off-line, or after a rewind with the TSZ07 off-line, the alphanu-
meric display shows the density the TSZ07 has just selected (found den-
sity) with a message, either ID 6250 or ID 1600, for approximately five
seconds. If the TSZ07 does not detect an allowable density, it displays
either the message BLANK or the message ID UNKWN. The BLANK
message indicates that the tape is blank. The ID UNKWN message in-
dicates that the tape was written in a format that the TSZ07 cannot
read.
The TSZ07 can prevent writing in a density commanded by an operator or
the host under one condition. If a read from BOT is followed immediately
by a WRITE command in a different density, the TSZ07 will only write
in the density determined by the identification burst found on the tape
(found density); in other words, the TSZ07 ignores the command to
append data in a different density. However, if a rewind precedes the
WRITE command, or if a WRITE is the first tape motion command after
a tape is loaded, the commanded density becomes the operating density
and the TSZ07 ignores the found density. This ensures that an operator
or the system cannot write a mixed density tape.
3.4.4 User Density Selection
You can select the operating density at the front panel. See Section 3.2.8.
3.5 Activity Messages
The TSZ07 uses the alphanumeric display to provide messages to the
user. Table 3-1 lists the messages normally displayed during operation.
Other messages may be displayed under other circumstances, such as
error messages (see Table 3-2).
Operation 3–7