On Apr 23, 7:47 am, "Michael J. Mahon" <mjma...@aol.com> wrote: > The very first RWTS may have been 4+4 coding, but Woz quickly progressed > to 5+3, then later to 6+2. The final iteration was the ProDOS-style > RWTS that decodes nibbles to data on the fly. I seem to recall the last iteration was developed by Woz for Apple Pascal, but quickly made it's way into SOS as well, and ultimately ProDOS Matt