How do you tell SDA to read in additional system loadable images that are not in the SYS$LOADABLE_IMAGES or SYS$LIBRARY directories with the SDA> READ/EXEC command?
Modify the SDA$READ_DIR logical search list to include the directory containing the additional loadable images.
By default, the logical name SDA$READ_DIR is defined as a search list that points to SYS$SYSROOT:[SYS$LDR],SYS$SYSROOT:[SYSLIB]. You can modify this logical to include a directory that contains user or vendor supplied system loadable images. For example, to enable SDA to automatically include Multinet system loadable images do the following:
$ SHOW LOGICAL SDA$READ_DIR "SDA$READ_DIR" = "SYS$SYSROOT:[SYS$LDR]" (LNM$SYSTEM_TABLE) = "SYS$SYSROOT:[SYSLIB]" . $ DEFINE/SYSTEM/EXECUTIVE_MODE SDA$READ_DIR SYS$SYSROOT:[SYS$LDR],SYS$SYSROOT:[SYSLIB],MULTINET %DCL-I-SUPERSEDE, previous value of SDA$READ_DIR has been superseded
Now when you run SDA and do SDA> READ/EXEC it will be able to locate the Multinet images as well as the OpenVMS images.