#define bishopPR_width 32
#define bishopPR_height 32
-static char bishopPR_bits[] = {
+static unsigned char bishopPR_bits[] = {
0xff,0xff,0xff,0x7f,0x01,0x00,0x00,0xc0,0x01,0x00,0x00,0xc0,0x01,0xd4,0x36,
0xc0,0x01,0x06,0x00,0xc0,0x02,0xfe,0x1f,0x60,0x02,0x80,0x19,0x60,0x02,0xf8,
0x1f,0x60,0x02,0x80,0x19,0x60,0x04,0xf8,0x1f,0x30,0x04,0x80,0x19,0x30,0x04,