IBM 3590 - Manual (Page 42)

mount portion of the demount/mount message is displayed. For a loaded
cartridge, the demount portion of the message is deleted when the accessor
removes a cartridge from the loader.
A message control of “100” (alternate message) will cause the demount and
mount messages to alternate as long as a cartridge is loaded. Demount is
deleted when a cartridge is unloaded.
Routine Messages—General (Custom):
v Creation: A General message is created when a Display Message is received
that requests a General message. A General message received while an
earlier General message exists replaces the first General message.
v Displayed: A General message displays when it is created.
v Deletion: When the device activity changes, or the Enter key is pressed, or
when any other Routine Message enters a display mode a General message
is deleted.
Routine Messages—Clean:
v Creation: When the device microcode detects that the device needs
cleaning, it creates a Clean message. This is checked at every unload. When
a diagnostic routine detects the need for cleaning, it may also create a Clean
message.
v Stored: When created, a Clean message is stored. When the Enter button is
pressed, a displayed Clean message is stored. It is overlaid by another
stored message, or if no other intervention message is present, by the
Options/Status screen.
v Displayed: When the device is unloaded, a Clean message is displayed.
v Deletion: When the device is loaded, a Clean message is deleted. This
occurs regardless of whether the cartridge loaded was a data cartridge or a
cleaner cartridge. When the currently-loaded cartridge is unloaded, another
Clean message will be generated if the device was not cleaned. A Clean
message is also deleted when the device goes through a power-off to
power-on cycle or when the operator panel Reset button is pressed.
Combination Rules for Routine Messages: When any message enters display
mode, it is combined with any other messages that already may be displayed
in a sequence of messages. Newly-displayed messages are appended at the
end of the message sequence.
In most cases, the message sequence will not grow beyond 2 or 3 alternating
messages. It can grow to a 4- or 5-part message if a Clean message is also
displayed. This situation happens when 2-part mount messages, 2-part
demount messages, or combined demount/mount messages are followed by a
2-part General message.
22 3590 Operator Guide