#6: fix exclamation mark mapping

ebcdic.go

@@ -8,7 +8,7 @@ package go3270
 // the corresponding EBCDIC (codepage 37) value.
 var ebcdic = []byte{
 	0, 1, 2, 3, 55, 45, 46, 47, 22, 5, 37, 11, 12, 13, 14, 15, 16, 17, 18, 19,
-	60, 61, 50, 38, 24, 25, 63, 39, 28, 29, 30, 31, 64, 79, 127, 123, 91, 108,
+	60, 61, 50, 38, 24, 25, 63, 39, 28, 29, 30, 31, 64, 90, 127, 123, 91, 108,
 	80, 125, 77, 93, 92, 78, 107, 96, 75, 97, 240, 241, 242, 243, 244, 245,
 	246, 247, 248, 249, 122, 94, 76, 126, 110, 111, 124, 193, 194, 195, 196,
 	197, 198, 199, 200, 201, 209, 210, 211, 212, 213, 214, 215, 216, 217, 226,
@@ -32,7 +32,7 @@ var ascii = []byte{
 	128, 129, 130, 131, 132, 10, 23, 27, 136, 137, 138, 139, 140, 5, 6, 7,
 	144, 145, 22, 147, 148, 149, 150, 4, 152, 153, 154, 155, 20, 21, 158, 26,
 	32, 160, 161, 162, 163, 164, 165, 166, 167, 168, 91, 46, 60, 40, 43, 33,
-	38, 169, 170, 171, 172, 173, 174, 175, 176, 177, 93, 36, 42, 41, 59, 94,
+	38, 169, 170, 171, 172, 173, 174, 175, 176, 177, 33, 36, 42, 41, 59, 94,
 	45, 47, 178, 179, 180, 181, 182, 183, 184, 185, 124, 44, 37, 95, 62, 63,
 	186, 187, 188, 189, 190, 191, 192, 193, 194, 96, 58, 35, 64, 39, 61, 34,
 	195, 97, 98, 99, 100, 101, 102, 103, 104, 105, 196, 197, 198, 199, 200,