#define verti_width 15
#define verti_height 15
-static char verti_bits[] = {
+static unsigned char verti_bits[] = {
0x84, 0x10, 0x84, 0x10, 0x84, 0x10, 0x84, 0x10, 0x84, 0x10, 0x84, 0x10,
0x84, 0x10, 0x84, 0x10, 0x84, 0x10, 0x84, 0x10, 0x84, 0x10, 0x84, 0x10,
0x84, 0x10, 0x84, 0x10, 0x84, 0x10};