hi , I didnot find any information on 387ex coprocessor , not even the pinouts, I am trying to interface the coprocessor with 386ex.first i was was looking for the 387sx as mensioned in the intel 386ex manuals.but the suuplier gave me the 387ex of which i have never heard off. if any one has nay information on this misterius coprocessor please inform me ,i will me very thankfull, i am also a short on time . thanks --------------------------------- Do you Yahoo!? Free Pop-Up Blocker - Get it now