Hi Amrith,
Thanks again help!
I use a Keil C emulator to run the C prohram mentioned in about paper on 8051 board which is connected to PC through a device UC232A ( RS232 to UAB cable). when I type the Keyboard of PC, there is to see the char display on Hyperterminal.
I change the C program which is dowdload from http://www.keil.com/forum/933 and run the program. I got the result as expectation.
Also I do not understand that some sentance such as P1=value and P2=P1-32 in C code of your paper.
May I use email for sent more information to you.
my email address: [email protected].