Thnx for the information ppl
But i have already started my design usign 8255, and as i only have a limited time to complete my project....so i cannot turn to any other option now.
So we have no means to check the data transfer to 8255 from 8051 rite???
But i resorted to another method.....and i hoped that it would give me correct result.....i tried to find the output at each pin using a simple multimeter(it should tell me which bits are zero and which are one !!)
But, as i did so i found the output voltage at some of the pins to be 2.8 volts....how should i interpret this ....logic high (if it is logic high why is it not 5V)???