This is probably the most common way to share a 3494 ATL or 3494 VTS. All z/OS systems share a common VMF and a common TCDB. In this environment, very few modifications to the CA TLMS supplied entry and eject exits would need to be done. If you wanted to have the ability to enter foreign tapes into the robot (cartridges not defined to CA TLMS), you would have to change the entry (CBRUXENT) exit. In the CA TLMS supplied exit (CTSUXENT in the CAI.CTAPSAMP library) there is a small branch table after label "ASKCA;" where a branch to labels RC0, RC4, RC8, RC12, RC16, and RC20 is made. If you want to read foreign tapes inserted into the 3494, the easiest modification is to change the branch table so that in the case of a foreign tape the branch is made to RC8 instead of to RC16. So simply change "B RC16" to "B RC8" for foreign tapes. If you will not be reading foreign tapes inside the 3494 (for example, if the 3494 VTS has no native-attached physical devices) then there is no need to modify either the entry or eject exits supplied with CA TLMS other than to define your ATL(s).
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