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RCR: Rotate Right through Carry:- This instruction rotates the contents bit-wise of the destination operand right by the specified count through carry flag (CF). For each operation, the carry flag is pushed into the MSB of the operand and the LSB is pushed into carry flag. Remaining bits are shifted right by the specified count positions. The PF, SF, ZF are not changed. The operand can be or memory location or a register. Given figure explains this operation.
Figure: Execution of RCR Instruction
RCL: Rotate Left through Carry:- This instruction rotates bit-wise the contents of the destination operand left by the specified count through the carry flag (CF). For each operation, the carry flag is pushed into LSB, and the MSB is pushed into the carry flag. Remaining bits are shifted left by the mention positions. The PF, SF, ZF are left operation. The operand can be memory location or a register. Given figure explains the operation.
Figure: Execution of RCL Instruction
The count for shifting or rotation is either 1 or is specified by using register CL, in case of all of the rotate and shift instructions.
SUB: Subtract :- The subtract instruction subtracts the source operand from destination operand and result is left in the destination operand. Source operand might be memory locati
PTR : Pointer:- The pointer operator which is used to declare the type of a variable, label or memory operand. The operator PTR is prefixed by either WORD or BYTE. If the prefi
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RET : Return from the Procedure:- At each CALL instruction, the register IP and register CS of the next instruction is pushed to stack, before the control is transferred to the
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INTO : Interrupt on Overflow:- It is executed, when the overflow flag OF is set. The new contents of IP and CS register are taken from the address 0000:0000 as described in INT
Addressing mode of 8086 : Addressing mode specify a way of locating operands or data. Depending on the data types used the memory addressing modes and in the instruction ,
Pin functions for the minimum mode operation of 8086 are following: 1) M/I/O -Memory/IO: This is a status line logically equivalent to S2 in maximum mode. When it is low, it
64-bit integer calculator, which processes using 16-bits at a time (reg/mem16 operands)
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