No, the NS* hard sector format done not use or encode all the marks used by most FDC chips. The upside of NS* is that a simple data seperator and a shift register are all thats needed to read it (look at the board schematics). Most fo the board is centered on getting the data rate down to something an 8080 can handle. Data bit rates for NS* are 125 and 250kb/s so it's very slow relative to what most newer machines can do. Allison