Hi Ahmed, let me give you an advise, I´m an electronics enginner, and I´ve been working for several years with SBC´s based on 8088, and Z80. About six months ago, I´ve decided to implement 8052 because it´s really a powerful micro, besides the limitations it has compared to 8088. I´ve built a couple of SBC based on my designs and it was a headache. Then I´ve bought my own SBC ready to go based on Dallas 320 micro. My advise, don´t waste your time, there´s a bunch of ready-made boards working just right.