#define knightPR_width 32
#define knightPR_height 32
-static char knightPR_bits[] = {
+static unsigned char knightPR_bits[] = {
0xfc,0xff,0xff,0x1f,0x04,0x00,0x00,0x30,0x04,0x00,0x00,0x30,0x04,0xfe,0x0d,
0x30,0x04,0x30,0x0c,0x30,0x08,0x30,0x0c,0x18,0x08,0xfc,0x0c,0x18,0x08,0x30,
0x2c,0x18,0x08,0xfe,0x1e,0x18,0x10,0x30,0x0c,0x0c,0x10,0xfc,0x3e,0x0c,0x10,