IBM Mainframe Forum

Hi,



please explain me the usage of the above code and its working.

Regards,

Utpal

You have not told us what the contents of A, B and C are.

Why not write a small program that implements these instructions and find out for yourself?

Assemble and run this -

WTO11+8(10) stands variable WTO11's 9th byte to 17th bytes, MVC WTO11+8(10),A setting WTO11+8(10) to a.
i didn't test this code, i think it will display a message like %%%%%%%%AAAAAAAAAA%%BB%%CCCC%%%%%%%%%% in your JESMSG.

i tested it, message like this:

03.15.03 JOB05369 +AAAAAAAAAA%%BB%%CCCC%%%%%%%%%%%%%%%%%%

it looks like command wto occupy the first 10 bytes of wto11. wto11 point to the head address of that line.

You have the right idea, but are far wrong about the details.

WTO is a macro. It is not a command. An Assembler macro definition is a skeleton that causes the Assembler to generate code. SYS1.MACLIB(WTO) is the macro definition. You might want to look at it, though don't try to understand it; it is quite involved, and it represents more than 40 years of patches. If its original author is still alive, he would almost certainly not recognize it, possibly have trouble finding anything he wrote.

it looks like command wto occupy the first 10 bytes of wto11. wto11 point to the head address of that line.

It would appear you did not bother to look at the macro expansion (the code generated by the macro) in the program listing. There is no command there!