User`s guide

REMOVE
You cannot remove a loaded device or any of the following handlers:
SY (the handler for the system device)
BA (the BATCH handler)
MQ (the message queue handler)
TT (the terminal handler)
If you attempt to remove a device that does not exist in the running monitor’s system
table, RT–11 displays an error message.
Use the SHOW DEVICES command to display on the terminal a list of devices that
are available on your system.
Issuing a REMOVE Before an INSTALL
• If there are no free device slots (use the SHOW DEVICES command to ascertain
this), you must remove an existing device (with the REMOVE command) before
you can install a new device.
• If you COPY or RENAME a handler, you should also issue a REMOVE to ensure
that the system will use the latest copy of the handler. For example, if you take
a handler, such as SDH.SYS, and RENAME it to SD.SYS, issue a REMOVE and
an INSTALL after you change the handler to ensure that the system uses the
new version of the handler:
.COPY SDH.SYS SD.SYS
.UNLOAD SD
.REMOVE SD
.INSTALL SD
In this situation, ignore any error message you may get from issuing the
UNLOAD and REMOVE commands.
• Apply this same rule (using REMOVE and INSTALL) to any newly installed
handler. Otherwise, RT–11 may use an old copy of the handler rather than the
newly installed one.
The following command removes the line printer handler and the logical-disk handler
from the system:
.REMOVE LP:,LD:
Removing a Global Region from Extended Memory
When RT–11 is running under a mapped monitor, you can use the REMOVE
command to remove a global region from extended memory and to return the memory
allocated to that global region to the free memory list.
Some regions are not removable; for example:
IOPAGE
KERNEL
MCA
Any attempt to eliminate a global region attached to a job returns an error message.
202 RT–11 Command Descriptions