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Difference Between 8086 And 80386

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  1. Difference Between 8085 And 8086 And 80386
  2. Difference Between 8086 And 80286 And 80386
  3. Difference Between 8086 And 80386

Though the architecture and instruction set of both 8086 and 8088 processors are same, still there are differences between them.
Following is the table listing the differences between the 2 microprocessors:

80386

Difference Between 8085 And 8086 And 80386

S. No.8086 microprocessor8088 microprocessor
1The data bus is of 16 bits.The data bus is of 8 bits.
2It has 3 available clock speeds (5 MHz, 8 MHz (8086-2) and 10 MHz (8086-1)).It has 3 available clock speeds (5 MHz, 8 MHz)
3The memory capacity is 512 kB.The memory capacity is implemented as a single 1 MX 8 memory banks.
4It has memory control pin (M/IO) signal.It has complemented memory control pin (IO/M) signal of 8086.
5It has Bank High Enable (BHE) signal.It has Status Signal (SSO).
6It can read or write either 8-bit or 16-bit word at the same time.It can read only 8-bit word at the same time.
7Input/Output voltage level is measured at 2.5 mA.Input/Output voltage level is measured at 2.0 mA
8It has 6 byte instruction queue.It has 4 byte instruction queue as it can fetch only 1 byte at a time.
9It draws a maximum supply current of 360 mA.It draws a maximum supply current of 340 mA.

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Difference between 8086 and 80386

15.6 Differences From 8086 In general, V86 mode will correctly execute software designed for the 8086, 8088, 80186, and 80188. Following is a list of the minor differences between 8086 execution on the 80386 and on an 8086. Instruction clock counts. The 80386 takes fewer clocks for most instructions than the 8086/8088. The Pentium, 80486, and 80386 microprocessors push a different value of SP on the stack for a PUSH instruction than does the 8086. The 32-bit processors push the value of the SP before it is decremented whereas the 8086 pushes the value of the SP after it is decremented. And we know that 8086 is a 16-bit microprocessor, that operates on 2 banks. But 80386 in general has a 32-bit data bus that needs 4 banks. So, to access some of the features of 80386 in a system having 8086 processor, we use 80386SX as processor having data bus of 16-bit.

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Difference Between 8086 And 80286 And 80386

Difference between 8085 and 8086 and 80386

Difference Between 8085 And 8086 And 80386

S. No.8086 microprocessor8088 microprocessor
1The data bus is of 16 bits.The data bus is of 8 bits.
2It has 3 available clock speeds (5 MHz, 8 MHz (8086-2) and 10 MHz (8086-1)).It has 3 available clock speeds (5 MHz, 8 MHz)
3The memory capacity is 512 kB.The memory capacity is implemented as a single 1 MX 8 memory banks.
4It has memory control pin (M/IO) signal.It has complemented memory control pin (IO/M) signal of 8086.
5It has Bank High Enable (BHE) signal.It has Status Signal (SSO).
6It can read or write either 8-bit or 16-bit word at the same time.It can read only 8-bit word at the same time.
7Input/Output voltage level is measured at 2.5 mA.Input/Output voltage level is measured at 2.0 mA
8It has 6 byte instruction queue.It has 4 byte instruction queue as it can fetch only 1 byte at a time.
9It draws a maximum supply current of 360 mA.It draws a maximum supply current of 340 mA.

Attention reader! Don't stop learning now. Get hold of all the important CS Theory concepts for SDE interviews with the CS Theory Course at a student-friendly price and become industry ready.

15.6 Differences From 8086 In general, V86 mode will correctly execute software designed for the 8086, 8088, 80186, and 80188. Following is a list of the minor differences between 8086 execution on the 80386 and on an 8086. Instruction clock counts. The 80386 takes fewer clocks for most instructions than the 8086/8088. The Pentium, 80486, and 80386 microprocessors push a different value of SP on the stack for a PUSH instruction than does the 8086. The 32-bit processors push the value of the SP before it is decremented whereas the 8086 pushes the value of the SP after it is decremented. And we know that 8086 is a 16-bit microprocessor, that operates on 2 banks. But 80386 in general has a 32-bit data bus that needs 4 banks. So, to access some of the features of 80386 in a system having 8086 processor, we use 80386SX as processor having data bus of 16-bit.

Difference Between 8086 And 80286 And 80386

14.8 Differences From 80286 Real-Address Mode The few differences that exist between 80386 real-address mode and 80286 real-address mode are not likely to affect any existing 80286 programs except possibly the system initialization procedures. 14.8.1 Bus Lock The 80286 processor implements the bus lock function differently than the 80386.

Difference Between 8086 And 80386

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