Why can only 256 bytes be moved from one address to another
in a MVC?
- 6 Answers
- 12849 Views
- CSC, HCL, IBM, I also Faced
- E-Mail Answers
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.
| Is This Answer Correct ? | 2 Yes | 1 No |
Post New Answer View All Answers
explain about maximum displacement and how to cross this limit?
Explain the difference between various read and find statement?
Explain how to pass instream data in sysin with assembler?
Ap wkur,=p5 where wkur is a label?
how to initialize a register to 0000?
explain icm instruction?
What is need of start 0? In steed of can we use anyother numerics? If we use what will happen?
What is maximum displacement and how to cross this limit?
How to pass the parameters from jcl to assembler program?
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?
What is need of start 0?
Explain how to initialize a register to 0000?
What is maximum displacement?
Why do we use "drop"?
What is the use of trt instruction?
