original GPS library source

I'd like to decode some serial NMEA sentences other than the standard 2 GPS sentences in the GPS library. Whilst I've seen this library described as "simple parsing code" I really don't want to have to start from scratch. Can someone please advise if the source is available and where it might be found?
I'm not interested in intermediate driver versions.
Thanks

The source of the original GPS library was a modified version of a third party library. According to their license it is not possible to share the source code.

The way it worked was by appending the text to a StringBuilder object and checking if there are any complete sentences each time.

Assuming you were after C# and not Basic4ppc source code there is serial port handling and NMEA parsing code in the the archive for my GPSSerial library.