Answer Posted / roocarlin

the length of the MVC instruction itself is 6, one byte for the opcode, one byte for the length of the move-data, 2 bytes for base-displacement of the receiving field, and 2 bytes for the base-displacement of the sending field. since the length field in the MVC instruction is 1 byte, the values can be 0 to 255, thus you would be moving 1 to 256 bytes.

Explain how to initialize a register to 0000?

783

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How do you round the addition or subtraction of two numbers in assembler?

781

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Explain about house keeping in assembler?

802

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How to pass the parameters from jcl to assembler program?

729

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Explain how to pass instream data in sysin with assembler?

823

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Explain how to access vsam file?

843

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What does "using" do?

768

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How are data passed from jcl parm to assembler program?

756

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What is need of start 0?

858

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What is maximum displacement?

843

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Explain about base register?

794

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explain about maximum displacement and how to cross this limit?

877

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how to retrieve the instream data in sysin?

875

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In the house keeping section of an MVS assembly language program, like the one below STM R14,R12,12(R13) BASR R12,R0 USING *,R12,R11 LA R11,2048 LA R11,2048(R11,R12) .... .... 1. What if BASR R12,R0 IS NOT PRECEDE USING *,R12,R11? 2. USING (base address), REGISTER does USING directive says assembler to treat particular Register as a base register with the mentioned base address..in the above case * i.e current location counter..well if that is the case why we need BASR R12,R0 ? 3. What if I write like STM R14,R12,12(R13) BASR R12,R0 LA R11,2048 LA R11,2048(R11,R12) USING *,R12,R11 there is no address resolution being calculated in both LA statements so is it a right way to set Base register?..will there be any issues with Domain regarding R11 and R12?

1722

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Explain the difference between various read and find statement and which one should be used when for better adabas performance?

753

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