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dear saad..
for download new version of keil you have to fill given form and after that you can download latest version of keil..
https://www.keil.com/demo/eval/c51.htm
thank you.
hi dharmik…
following staps you should follow for run your project on proteus software.
1. first make connection as your circuit diagram.
2.now you need one other software KEIL for programing solution. you just write new programm on keil and creat hex file.
3. now make double click on controller so you can see screen as below..
here PROGRAM FILE option as below and click on folder like option..
4. and select hex file which is create by keil.
5. now run your simulation
i hope your project will work…..
thank you…
hello dharmik….
you know basic about port 0 so as we know that port 0 has multiplex address and data bus so
if we not connect external pullup than it will sink current from both one from inside supply as well as outer vcc supply and it would be a large current flow through internal transistor so it will damage port so thats why…..we use external pull up resistor is used in port 0 rathar than other port because other port not have any multiplexing add or data bus.