Thanks duncan303 for your feeling with me,

I'm untill now working on a project for queuing system , which have 18 digits of seven segment and PS/2 barcode reader and printer and serial eeproms and other buttons and LCD
The objective of this system is :
1- Student must insert his ID card in barcode reader to get his ID number
2- Microcontroller check its number and look for his information on serial eeprom
3- Microcontroller decide to print his information and serially number on a sheet of paper
4- Student must wait for his number untill it's display on seven segment
5- After that Employee give student the requested service and press on a button to take another number of student

I completed untill now the barcode and the printer stage but I think that the pins of PIC16f877a is not enough so I need another PIC so I worked on this stage.