IBM Assembler Question:
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Why can only 256 bytes be moved from one address to another in a MVC?


Lenght feild is 8 bits so the data is stored in binary
format so if we have all 8 bits set to 1 then the length
will be 128+64+32+16+8+4+2+1 = 255.or
2^7+ 2^6+2^5...2^0 = 255.

so the lenght is 256 .

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