Steve, I already checked the URL you posted, its Phillips semiconductor application notes. That has many goodies, but unfortunately I did not find any application notes for PC keyboard interface.

I remember once PETER mentioned somewhere at 8052.com in response to the same question (as mine) that it had been answered earlier on the 8052.com site. But I do not know when ???

If some one can help me, would be great help, I will still search other areas also.

Meanwhile, I successfully developed code for IR txmit and Rx with 100% error free carrier generation and receiving.

Thanks to Steve, Peter, Jay C ,Babar and to others. I have almost completed my project with IR, LCD interface, Serial communication and software based RTC, all I have learned and finished successfully. Now only RS485 and software Timer for making certain (user defined) time for switchig devices ON/OFF needed to be implemented. I am doing this while I am preparing for my next project. I was almost novice 5 months back and now I feel I can do many things.

Of course Craig deserves special thanks as he created such a place where we all meet and became possible for all of us to help each other. Thanks Craig.

Rauf