https://www.booktopia.com.au/assembler-language-programming-for-ibm-and-ibm-compatible-computers-formerly-370-360-assembler-language-programming--nancy-b-stern/book/9780471886570.html
Assembler Language Programming for IBM and IBM Compatible Computers (Formerly 370/360 Assembler...
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https://www.ibm.com/docs/en/ims/15.5.0?topic=areas-coding-cics-online-program-in-assembler-language
IMS 15.5 - Application programming - Coding a CICS online program in assembler language
The following code example in assembler language shows how you define and establish addressability to the UIB.