REX_P0REG_YENDI
rex_write(dc, REX_PAGE0_SET, REX_P0REG_YENDI, yendi);
rex_write(dc, REX_PAGE0_SET, REX_P0REG_YENDI, to_y);
rex_write(dc, REX_PAGE0_SET, REX_P0REG_YENDI, y + font->fontheight - 1);