code: static void checkLoPreamble(final Memory mem) {
      rtAssertEquals(getSerVer(mem), SER_VER & 0XFF);
      final Format fmt = getFormat(mem);
      final int preIntsDef = getDefinedPreInts(fmt) & 0XFF;
      rtAssertEquals(getPreInts(mem), preIntsDef);
      final Family fam = getFamily(mem);
      rtAssert(fam == Family.CPC);
      final int lgK = getLgK(mem);
      rtAssert((lgK >= 4) && (lgK <= 26));
      final int fiCol = getFiCol(mem);
      rtAssert((fiCol <= 63) && (fiCol >= 0));
    }
docs: basic checks of SerVer, Format, preInts, Family, fiCol, lgK.