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what is need of START 0?. In steed of '0' can we use any
other numerics?. if we use what will happen?.
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Answer Posted / alok
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.
| Is This Answer Correct ? | 9 Yes | 4 No |
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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?
