I wanted to know if the output of the Port0 is being loaded or not??? its because I have connected 2 NVRAMs and 1 HC373.

Hallo Raj,

your question is really relevant, because it can often be read, that a standard 8052 microcontroller is not well suited to drive extended busses.

If you have a look into datasheet you will find a note, that capacitive loading on ports 0 and 2 may cause spurious noise to be superimposed on the Vols of ALE and ports 1 and 3. And you will find a specification about what is relevant capacitive loading and what not: 100pF. If you have bigger capacitive load per port 0 or 2 pin, then trouble will result!

For your situation: Take into account about 3pF typical per input of chip. Maximum input capacitance is often specified to be about 10pF. So, you should not connect more than about 10 chips to each port pin. But if you have routed long copper traces to your chips, also stray capacitance of copper traces add to the capacitive loading...
Keep in mind, that outputs do also introduce stray capacitance increasing capacitve load. Have a careful look at datasheet about this input, output capacitance specifications.

It's important to keep in mind, that manufacturer assume the best possible PCB configuration, when
making these certain specifications! So, if your PCB does not contain a solid ground plane for instance, then much less capacitve load than 100pF can cause trouble! It will happen what Erik already focused: Ringing over ringing, and as result eroded timing. So, please use at least a double sided PCB containing a solid ground plane, with shortest copper traces and including proper power supply decoupling. Then you will not have any problems with your circuit, I think.

Kai