§ 800. Applicability. The provisions of this article shall apply, to the exclusion of all other provisions of this chapter relating to good behavior allowances, where sentence has been imposed pursuant to the provisions of the penal law as enacted by chapter ten hundred thirty of the laws of nineteen hundred sixty-five, as amended, or where the sentence is a reformatory sentence of imprisonment. Matters not expressly covered herein or covered in such penal law shall be governed by such other provisions of law as may be applicable.