Using the program that can be found here, I have successfully managed to dump a protected combinational PAL chip. The chip was one from a Street Fighter 2 C board and although it is already in the MAME set I wanted to test it againt something I knew was working.
To get this working a terminal emulator program is needed to capture the serial data. I used the free PuTTY program.
Once you have captured all the data and converted it using the PD.EXE program found in the link above, you can use WinCUPL to output a .JED file that can be used to create a functional GAL.
All credits goes to Charles MacDonald and Macro.