The rest of the 1 MB total memory goes to the microcontroller.

They are: AX, BX, CX, DX What and how many 8 bit general purpose registers are there 8, 8 bit general purpose registers.

IP (Instruction Pointer) is responsible for storing the instruction of the next executable instruction.

Immediate addressing The addressing mode in which the data operand is a part of the instruction itself is known as immediate addressing mode.

Base addressing In this addressing mode, the offset address of the operand is given by the sum of contents of the BXBP registers and 8-bit16-bit displacement.

Base-index addressing In this addressing mode, the offset address of the operand is computed by summing the base register to the contents of an Index register.

Relative addressing In this the effective address is calculated with reference to instruction pointer.

Addressing applied in string processing instructions This addressing mode is related to string instructions.

Stack addressing The stack memory addressing mode is used whenever you perform a push or pop operation.

Always a word will be entered or popped from the stack in this addressing mode, and the value of the Stack Pointer (SP) will be incremented or decremented accordingly.

It is of 16 bits and is divided into two 8-bit registers AH and AL to also perform 8-bit instructions.

It is generally used for arithmetical and logical instructions but in 8086 microprocessor it is not mandatory to have accumulator as the destination operand.

It is of 16 bits and is divided into two 8-bit registers BH and BL to also perform 8-bit instructions.

It is of 16 bits and is divided into two 8-bit registers CH and CL to also perform 8-bit instructions.

It is of 16 bits and is divided into two 8-bit registers DH and DL to also perform 8-bit instructions.

Example: Mov AX, 0005H Direct Addressing Mode In it, a 16-bit memory address (offset) or an inputoutput address is directly specified in the instruction as a part of it.

Data is supposed to be available at the address pointed to by the content of any of the above registers in the default data segment.

Indexed Addressing Mode Here offset of the operand is stored in one of the index registers.

Based Indexed Addressing Mode The effective address of data is formed by adding content of base register Bx or Bp to the content of index register.

Relative Based Indexed Addressing Mode Here the effective address is formed by adding an 8 bit or 16-bit displacement with the sum of the content of any one of the index registers in the default segment.

It is of 16 bits.

It is used in the pointer addressing of data and as a source in some string related operations.

It is used in the pointer addressing of data and as a destination in some string related operations.

These registers each have an available space of 64 KB and 256 KB in total.

Addressing Modes Of 8086