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ISRO2011-5

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MOV [BX],AL

move the contents of AL to memory location whose address is in BX (source and target can be either way as per the IA, lets assume first is destination here)

say [BX]=200

so AL contents are moved to memory location 200

it is example of register indirect..
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Register indirect addressing means that the location of an operand is held in a register.
In register addressing mode, a register contains the operand. Depending upon the instruction, the register may be the first operand, the second operand or both.
In Immediate Addressing,an immediate operand has a constant value or an expression. When an instruction with two operands uses immediate addressing, the first operand may be a register or memory location, and the second operand is an immediate constant.
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