sir i tried to compile the program that you posted in post no.8, it didn't show any errors but in the middle of assembling the file, the MPASM prompted that there was an error (but didn't say what it is) and the progress bar for the asm file turned red. Did this program work for you? you used 16f877a right?

about the external dvd drive i will work on that as soon as i get my vdip2 working ... thanks!