I'm not familiar with GCBASIC, so you'd have to check to see if it supports the F819. The first line (#chip) would change for sure. The 2nd, you shouldn't have to because the F819 also supports those options and is pin compatable with the F628. The rest should remain the same.
"It compiles for most 10/12/16 series PIC controllers"
So hopefully it won't be a problem. Once again thank you for your help... I guess for now I shall get these.