#define silverP_width 32
#define silverP_height 32
-static char silverP_bits[] = {
+static unsigned char silverP_bits[] = {
0x00,0x00,0x00,0x00,0x00,0xc0,0x01,0x00,0x00,0x30,0x06,0x00,0x00,0x0c,0x18,
0x00,0x00,0x03,0x60,0x00,0xc0,0x00,0x88,0x01,0x20,0x80,0x01,0x02,0x20,0xfc,
0x1f,0x06,0x20,0x8c,0x01,0x06,0x20,0x0c,0x03,0x06,0x10,0x7c,0x03,0x04,0x10,