fb_clear
fb_clear(0, cons.y *ROM_FONT_HEIGHT, FB_WIDTH, FB_HEIGHT / 2, CONS_BG);
fb_clear(0, 0, FB_WIDTH, FB_HEIGHT, CONS_BG);
fb_clear(0, cons.y * ROM_FONT_HEIGHT, FB_WIDTH, ROM_FONT_HEIGHT,
void fb_clear(int, int, int, int, int);
fb_clear(240, 240, 240, 240, i);