The 15th century Latin manuscript containing a treatise by Parkosz was the very first proposal of Polish spelling. To account for all the phonemes of Polish some new letters were proposed, which are not available in the present day fonts. This makes difficult to quote the proposal when discussing the history of Polish spelling. The paper describes the transliteration proposed by the author which used the characters available in the Unicode standard. The ultimate solution is of course creating a specialized font and the paper mentions some aspects of this task.