Difference between 8080 and 8085 Microprocessor

In this section, we will see some differences between Intel 8080 MPU, and Intel 8085 MPU.

The Intel 8080 microprocessor was the predecessor of the 8085. Both was designed and manufactured by Intel, Both was an 8-bit Microprocessor.

Intel 8080 Microprocessor was released on April 1974 and Intel 8085 Microprocessor was introduced in 1976. 8085 is very close to the 8080 microprocessor, but some slight changes and modifications are present.

Difference between 8080 and 8085 Microprocessor :

Sr.No. 8080 microprocessor 8085 microprocessor
1 There is 8 dedicated pins are there as Data bus (D0 to D7). There is multiplexed 8 bit data pins are present for data bus (AD0 to AD7).
2 There is 16 address pins are present (A0 to A15). There is 8 pins Higher order Address bus (A8 to A15) and 8 multiplexed address bus (AD0 to AD7), and the Address Latch Enable (ALE) pins are present.
3 The power supply voltage is +5, -5 and +12 volts. The power supply is only +5 volts.
4 Single Interrupt pins are there (INT). With INT, there are four more interrupt pins (TRAP, RST7.5, RST6.5, RST5.5).
5 Serial Communication facility is not present. The Serial Communication facility is present with SID, SOD Pins and RIM, SIM instructions.
6 Additional chips for Clock and system controlling is needed. No additional chips are needed for clock and system controlling tasks.
7 It consists of 5 flags (Sign Flag, Zero Flag, Auxiliary Carry Flag, Parity Flag, Carry Flag). It also consists of 5 flags (Sign Flag, Zero Flag, Auxiliary Carry Flag, Parity Flag, Carry Flag).
8 Processor speed is upto 3.1 MHz. Processor speed is upto 6 MHz.
9 8080 requires 8224 clock oscillator as well as 8228 system controller to operates. 8085 is functional with only latches and gates.
10 8080 supports upto 256 Input/Output(I/P) ports. 8085 also supports upto 256 Input/Output(I/P) ports.

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