I’ve updated the article about LAY to include how to decrement a register with LAY. If you haven’t seen this before, it’s worth a look. Read about LAY here.
Review an Instruction: LAY (IBM Assembler – HLASM)
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Your all articles are good, I follow most of documentation. In this perticular Doc i think there is spelling mistake in the End. instead of LA its printed LY
Can you be a bit more specific?