Imul instruction in 8086 architecture

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Arithmetic Instructions ; SBB, Subtract immediate data with borrow from accumulator, memory or register. ; MUL, Unsigned 8-bit or 16-bit multiplication. ; IMUL The two-operand form of imul executes a signed multiply of a register or memory word or long by a register word or long and stores the product in that registerThere are two instructions for multiplying binary data. The MUL (Multiply) instruction handles unsigned data and the IMUL (Integer Multiply) handles signed data Microprocessor - 8086 Instruction Sets, The 8086 microprocessor supports 8 types of IMUL − Used to multiply signed byte by byte/word by word. This instruction has three forms, depending on the number of operands. - One-operand form. This form is identical to that used by the MUL instruction.