IBM 3590 - Manual (Page 34)

Processor Check Indicator
The processor check indicator indicates that the model-unique
Licensed Internal Code is not following its normal sequence.
A symbol that looks like a wrench identifies the Processor
Check indicator on the operator panel. See Figure 2 on page 7
definitions for more details.
File Protected Icons
The status icons area of the operator panel displays the file-protected icons
(see Figure 3 on page 9).
The file-protected icon (physical) is a read only symbol that is
displayed when the thumbwheel on the cartridge is set to the
file-protected position.
The file-protected icon (logical) is a read only symbol that is displayed
when the 3590 receives the Mode Select command from a host
program that sets the volume to a logically write-protected state. Both
Write Once Read Many (WORM) and Persistent Write Protect status
leave a volume logically write-protected on subsequent loads. A
subsequent Mode Select turns off a persistent Write Protection, while
WORM cannot be turned off. Associated Write Protection persists only
while a logical volume is loaded or until a Mode Select changes the
protection status. Associated Write Protection status is lost when a
volume is unloaded or the device is powered-off. File protection is
temporarily inactive during volume loading and unloading when the
device updates the volume control region (VCR) on the tape. (During
this period of time, the icon reverts to file-unprotected). Refer to IBM
3590 High Performance Tape Subsystem Hardware Reference for details.
The file-unprotected icon is a read/write symbol that is displayed when
the thumbwheel on the cartridge is set to the not file-protected
position.
Tape Position Indicator
If the device is processing, the tape-position indicator provides the operator
with a graphical representation of the device’s position. The representation is
14 3590 Operator Guide
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