This is probably the most common way to share an ATL or VTS. All z/OS systems share a common TMC and a common TCDB. In this environment, very few modifications to the CA 1 supplied entry and eject exits are needed. To enter foreign tapes into the robot (cartridges not defined to CA 1,) change the entry (CBRUXENT) exit. In the CA 1–supplied exit (CTSUXENT in the hlq.CTAPSAMP library) there is a small branch table after label ASKCA, where there is a branch to label RC0, RC4, RC8, RC12, RC16 and RC20 made. This can be done using the usermod CTSJUCBX.
To read foreign tapes inserted into the Tape Library, the easiest modification is to change the branch table. So, in the case of a foreign tape the branch is made to RC8 instead of to RC16. Do this by simply changing "B RC16" to "B RC8" for foreign tapes. If you are not reading foreign tapes inside the ATL (for example, if the VTS has no native-attached physical devices) then there is no need to modify the entry or eject exits supplied with CA 1.
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