unsigned char umkehrzeichen[256]={255,254,253,252,251,250,249,248,247,246,
                                  245,244,243,242,241,240,239,238,237,236,
								  235,234,233,232,231,230,229,228,227,226,
								  225,224,223,222,221,220,219,218,217,216,
								  215,214,213,212,211,210,209,208,207,206,
								  205,204,203,202,201,200,199,198,197,196,
								  195,194,193,192,191,190,189,188,187,186,
								  185,184,183,182,181,180,179,178,177,176,
								  175,174,173,172,171,170,169,168,167,166,
								  165,164,163,162,161,160,159,158,157,156,
								  155,154,153,152,151,150,149,148,147,146,
								  145,144,143,142,141,140,139,138,137,136,
								  135,134,133,132,131,130,129,128,127,126,
								  125,124,123,122,121,120,119,118,117,116,
								  115,114,113,112,111,110,109,108,107,106,
								  105,104,103,102,101,100,99,98,97,96,
								  95,94,93,92,91,90,89,88,87,86,
								  85,84,83,82,81,80,79,78,77,76,
								  75,74,73,72,71,70,69,68,67,66,
								  65,64,63,62,61,60,59,58,57,56,
								  55,54,53,52,51,50,49,48,47,46,
								  45,44,43,42,41,40,39,38,37,36,
								  35,34,33,32,31,30,29,28,27,26,
								  25,24,23,22,21,20,19,18,17,16,
								  15,14,13,12,11,10,9,8,7,6,
								  5,4,3,2,1,0
                                  };


Ausgabe = umkehrzeichen[datenbyte];