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What is need of START 0? In steed of can we use anyother numerics? if we use what will happen?


START is an assembler directive which has an optional
operand, (0 in your example). This operand acts as the
starting address of the program e.g. PROGNAME START X'3E0'
tells the linkage editor that this program is to be loaded
into main storage at address '3E0' in hex. This explanation
answers all your questions.

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What is the use of TRT instruction and how it is working?How do you round the addition or subtraction of two numbers in assembler?

What does the following code do?
AP WKUR,=P5 where WKUR is a label?