ASM binary

Hello all, I have been trying to find a way to use 386/486 instructions
under TP6, but I do not know the binary equivelents of many opcodes.  
Could anyone help me in this little endeavor.  I soon plan on creating a
small utility which will convert 386+ lines of PASCAL ASM and change them
into what the compiler can compile.  Simple eh?  I like simplicity.
-Steve