The TSSINS text file has been incorporated into the server machine nucleus. The nucleus load map for the server machine is contained in a file called TSSNUC MAP on the CAIMAINT virtual machine 291 disk for test installation, 391 disk for production.
The EXIT control option is ON. TSS MODIFY(STATUS) lists the status of EXIT.
To test your installation exit code you can set up debug code which executes the exit only for a particular ACID, virtual machine, etc. These fields are in the parameter list passed to the exit.
Ensure the server machine has been restarted by TSS MODIFY(RESTART) to bring in the copy of the exit.