HP 9840, Operation Manual

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9840 Menu System
9840 Tape Drive Operations Guide— 429596-002
B -17
Tape Bar-Chart Explanation
a. Press Select .
b. Press Menu repeatedly until “Exit Menu?” is displayed.
Main Exit Main Menu
Selections: “Exit Menu?”
This menu gives the user the opportunity to return the drive to online and exit the menu
system.
1. If applicable, press Menu to access.
2. To return to the Online/Offline Main Menu to return drive to online and exit:
a. Press Menu.
b. Return to the online/offline menu at the beginning of this table.
3. To exit the menu system without returning the drive to online, press Select .
Tape Bar-Chart Explanation
The tape bar-chart displays two horizontal bars, one showing how much tape has been
written, and the other showing how much tape has been read. When selected from the
menu, these bars are shown during read and write operations and when the drive is
Ready (idle) Mode. The bar display alternates with the Write, Read, and Ready display
depending on the present mode of the drive.
The bar gets its information from the MIR (Media Information Region) on the tape. This
information is written to tape when the tape is unloaded. If this information is bad, the
bar will not display. To rewrite the MIR information, the host must read the entire tape
and then unload it.
The displayed bars use all ten display segments on the operator panel. Each segment
is usually employed to a display number, letter, or symbol, but in “Bar Mode,” all ten
segments are used together to display the horizontal bars.
Each segment has seven vertical dots and five horizontal dots. There are fifty dots the
entire length of the display, so that each dot represents 2% travel and each segment
represents 10% travel of the bars.
Three rows of dots in the middle of the display represent the read bar and the two
outer rows on each side represent the write bar. However, where the read bar has not
penetrated, the write bar takes up all the rows. See
Figure B-7 .