| The data bus is 8 bits. |
The data bus is 16 bits. |
| The address bus is 16 bits. |
The address bus is 20 bits. |
| The memory capacity is 64 KB. Also, 8085 Can Perform Operation Up to 28 i.e. 256 numbers. A number greater than this is to be taken multiple times in an 8-bit data bus. |
The memory capacity is 1 MB. Also, 8086 Can Perform operations up to 216 i.e. 65,536 numbers. |
| The input/output port addresses are 8 bits. |
The input/output port addresses are 16 bits. |
| The operating frequency is 3.2 MHz. |
The operating frequency is 5 MHz, 8 MHz, and 10 MHz. |
| 8085 MP has a Single Mode Of Operation. |
8086 MP has Two Modes Of Operation. 1. Minimum Mode = Single CPU PROCESSOR 2. Maximum Mode = Multiple CPU PROCESSOR. |
| It does not have multiplication and division instructions. |
It has multiplication and division instructions. |
| It does not support pipelining. |
It supports pipe-lining as it has two independent units Execution Unit (EU) and Bus Interface Unit (BIU). |
| It does not support an instruction queue. |
It supports an instruction queue. |
| Memory space is not segmented. |
Memory space is segmented. |
| It consists of 5 flags(Sign Flag, Zero Flag, Auxiliary Carry Flag, Parity Flag, and Carry Flag). |
It consists of 9 flags(Overflow Flag, Direction Flag, Interrupt Flag, Trap Flag, Sign Flag, Zero Flag, Auxiliary Carry Flag, Parity Flag, and Carry Flag). |
| It is a low-cost Microprocessor |
It is a comparatively High-cost Microprocessor. |
| There are 5 Addressing Modes. |
There are 11 addressing modes. |
| There is no concurrency in Fetching, Decoding, and execution. |
There is Concurrency in Fetching, Decoding, and Execution because of the instruction queue. |
| It has almost 6500 transistors. |
It has almost 29000 transistors. |
| It is Accumulator based Microprocessor because Accumulator contains major activity in ALU Operations in store and updating calculations. |
It is General Purpose Registers(GPR) based microprocessor because there is no specific Accumulator attached to the input of ALU. all GPRs are connected with it via Bus. |
| Integer, Decimal, and Hexadecimal arithmetic is supported |
It also supports ASCII Arithmetic over Integer, Decimal, and Hexadecimal. |
| It needed less external hardware. |
It needed more external hardware. Because here more than 1 processor works and an additional external processor can also be employed as per requirements. |
| It runs over 50% duty cycle. That means for one instruction cycle clock pulse held high for 50% of the pulse. |
It runs over a 33% duty cycle. That means for one instruction cycle clock pulse held high for 33% of the pulse. |
| In the 8085 Microprocessor for immediate addressing modes there are instructions containing “I” in it. e.g. MVI, LXI, etc. |
In the 8086 Microprocessor for immediate addressing modes there is no instruction containing “I” in it. In other words, there is no MVI instruction in 8086 for moving/transferring data. Only MOV instruction is sufficient. |
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In 8085 microprocessor ADD, SUB instructions were carried out in Accumulator by default. It used only 1 register for arithmetic operations because another register is fixed and is an accumulator.
Example: ADD C will do [A]<- [A] + [C]
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In the 8086 microprocessor, we can give the source and destination register and according to that addition or any arithmetic operations will be performed.
For Example: ADD AX, BX will do [AX] <- [AX] + [BX]
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| The 8085 microprocessor operates at 5 volts. |
The 8086 microprocessor operates at 5 or 3.3 volts. |
| Less powerful and faster than 8086 microprocessor |
The 8086 microprocessor is faster and more powerful than the 8085 microprocessor. |
| The 8085 microprocessor handles interrupts using a software-based approach. |
The 8086 microprocessor uses a hardware-based approach. |