+// special character mapping for default fonts
+#define FONT_ASCII_CURSOR ((char)160)
+#define FONT_ASCII_BUTTON ((char)128)
+#define FONT_ASCII_UP ((char)129)
+#define FONT_ASCII_DOWN ((char)130)
+#define FONT_ASCII_LEFT ((char)'<')
+#define FONT_ASCII_RIGHT ((char)'>')
+
+#define MAP_FONT_ASCII(c) ((c) >= 'a' && (c) <= 'z' ? 'A' + (c) - 'a' : \
+ (c) == CHAR_BYTE_COPYRIGHT ? 96 : \
+ (c) == CHAR_BYTE_UMLAUT_a ? 97 : \
+ (c) == CHAR_BYTE_UMLAUT_A ? 97 : \
+ (c) == CHAR_BYTE_UMLAUT_o ? 98 : \
+ (c) == CHAR_BYTE_UMLAUT_O ? 98 : \
+ (c) == CHAR_BYTE_UMLAUT_u ? 99 : \
+ (c) == CHAR_BYTE_UMLAUT_U ? 99 : \
+ (c) == CHAR_BYTE_DEGREE ? 100 : \
+ (c) == CHAR_BYTE_REGISTERED ? 101 : \
+ (c) == FONT_ASCII_CURSOR ? 102 : \
+ (c) == FONT_ASCII_BUTTON ? 109 : \
+ (c) == FONT_ASCII_UP ? 110 : \
+ (c) == FONT_ASCII_DOWN ? 111 : \
+ (c))
+
+#define MAP_FONT_ASCII_EXT(c) ((c) == CHAR_BYTE_COPYRIGHT ? 128 : \
+ (c) == CHAR_BYTE_UMLAUT_A ? 129 : \
+ (c) == CHAR_BYTE_UMLAUT_O ? 130 : \
+ (c) == CHAR_BYTE_UMLAUT_U ? 131 : \
+ (c) == CHAR_BYTE_DEGREE ? 132 : \
+ (c) == CHAR_BYTE_REGISTERED ? 133 : \
+ (c) == FONT_ASCII_CURSOR ? 134 : \
+ (c) == CHAR_BYTE_UMLAUT_a ? 135 : \
+ (c) == CHAR_BYTE_UMLAUT_o ? 136 : \
+ (c) == CHAR_BYTE_UMLAUT_u ? 137 : \
+ (c) == CHAR_BYTE_SHARP_S ? 138 : \
+ (c) == FONT_ASCII_BUTTON ? 141 : \
+ (c) == FONT_ASCII_UP ? 142 : \
+ (c) == FONT_ASCII_DOWN ? 143 : \
+ (c))
+
+// 64 regular ordered ASCII characters, 6 special characters, 1 cursor char.
+#define MIN_NUM_CHARS_PER_FONT 64
+#define NUM_CHARS_PER_FONT_EXT 112
+#define DEFAULT_NUM_CHARS_PER_FONT (MIN_NUM_CHARS_PER_FONT + 6 +1)
+#define DEFAULT_NUM_CHARS_PER_LINE 16
+
+
+// font structure definitions