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

Answer Posted / hariconda

MVC FORMAT: SS1 format

ASSEMBLER: OPCODE D1(L,B1),D2(B2)

here the length field is 8 bits or 1 byte so the maximum
value we can move is 256 bytes.

to move more than this use MVCL instruction

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