7 segment

I need to interface three 7 segment displays with 8085. Now I need to control each of them individually through a push button. The 7 segment display will run a counter and I will use the push button to turn on and then turn off the counter and then display the no at which i stopped. I need to do this with three different 7 segments and display all 3 numbers simultaneously.

Now I need to knwo whether I should create a separate output port for each display or whether it can be achieved by multiplexing them

Multiplexing will reduce the number of pins needed by ~2/3. You can reduce the pin count further by using BCD-to-7segment decoders.