User`s guide

INSTALL
For example, if you want to install the LP device, RT–11 seaches for the file
SY:LP.SYS when installing LP on an unmapped monitor, and RT–11 searches for
the file SY:LPX.SYS when installing LP on a mapped monitor.
Note that you cannot install devices with the names SY, DK, or BA.
Issuing a REMOVE before an INSTALL
The INSTALL command lets you configure a special system for a single session
without having to reconfigure to revert to the standard device configuration:
• 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 do 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, do 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.
Examples
1. The INSTALL LS: command installs the serial line printer into the system tables
from the file LSx.SYS. The colon (:) that follows the device handler name is
optional:
.INSTALL LS:
2. This command installs the line printer and two device handlers:
.INSTALL LP:,DU:,DY:
Note that if RT–11 cannot install a device handler, it issues an error message
and does not install any other handlers following it in the command line. For
example, if DU could not be installed in the preceding command, DY would also
not be installed.
154 RT–11 Command Descriptions