This optional step provides for the installation of the 3480 message display exit. This applies only to a DFP system at Version 3.1 or higher. This exit is not supported in JES3 environments.
The 3480 message display exit is optional and, when installed into the operating system, provides the following two functions:
Module IGXMSGEX is a CA TLMS user exit to the IBM module IGX00030, which is responsible for handling requests made through the MSGDISP macro. This exit must be linked with IGX00030 to be activated.
If the request is for a scratch pool defined in the CTOSCRxx member in CAI.CTAPOPTN, the automatic cartridge loader request will be disabled and the first eight bytes of the scratch pool name will be placed in the first eight bytes of the message area passed in the parameter list.
It is assumed that CTSMSGEX has already processed the mount request and placed the scratch pool number in the mount list element entry for the specified UCB. This number will be used to locate the correct scratch pool entry and extract the scratch pool name.
If it is desired that the automatic cartridge loader (ACL) not be disabled for scratch pool requests, then the source for this exit is provided (see source member CTSMSGEX in CAI.CTAPSAMP) and can be modified. To prevent disabling of the ACL, comment out the following instruction after the label SCRATCH:
NI MSGFCB,255-MSGQACL A. DISABLE AUTO CART LOADER
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