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Differences between 8086 and 8088 microprocessors

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  • Difficulty Level : Medium
  • Last Updated : 10 Nov, 2022
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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:

S. No. 8086 microprocessor 8088 microprocessor
1 The data bus is of 16 bits. The data bus is of 8 bits.
2 It has 3 available clock speeds (5 MHz, 8 MHz (8086-2) and 10 MHz (8086-1)). It has 2 available clock speeds (5 MHz, 8 MHz)
3 The memory capacity is 512 kB. The memory capacity is implemented as a single 1 MX 8 memory banks.
4 It has memory control pin (M/IO) signal. It has complemented memory control pin (IO/M) signal of 8086.
5 It has Bus High Enable (BHE) signal. It has System Status Output (SSO) signal.
6 It can read or write either 8-bit or 16-bit word at once. It can read only 8-bit word at once.
7 Input/Output voltage level is measured at 2.5 mA. Input/Output voltage level is measured at 2.0 mA.
8 It has 6 byte instruction queue. It has 4 byte instruction queue as it can fetch only 1 byte at a time.
9 It draws a maximum supply current of 360 mA. It draws a maximum supply current of 340 mA.
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