hello thanks to a friend,all I finally have the datasheet of the dlart(dc319aa) ,the dl11 compatible uart used with the t11and the russian analog kr1807vm1.Those circuits are difficult to find,but at least the data sheet shows what the dlart does and how,it you need that documentation just ask. in Russia a similar product seems to exist: http://www.npofizika.ru/microcircuits/1582-0123.htm best regards to all