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Why can only 256 bytes be moved from one address to another
in a MVC?
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Answer Posted / mike m
THE LENGTH CODE FIELD IS 1 BYTE IN LENGTH.
THE LARGEST VALUE YOU MAY SPECIFY IN A 1 BYTE FIELD IS X'FF'
X'FF' = 255 DECIMAL
THE LEN. IN THE OBJECT CODE FIELD WILL BE 1 LESS THAN
ACTUAL LEN.
| Is This Answer Correct ? | 20 Yes | 1 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?
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