oky I have these things :
1- max232 converter
2- 4MHZ or 8MHZ crystal
3- PIC16F877A or PIC18f452 or PIC4220

I make a programm and put the values accoding to formula baud=fosc/(16(x+1)) or baud=fosc(64/(x+1))

but the data I recived from pic at pc is a strange data not know