包含绝对磁盘扇区读、写数据,直接使用BIOS服务的键盘接口,直接使用BIOS服务的打印机I/O,读取或设置BIOS时间等等小程序-contains absolutely disk sector read and write data directly using the BIOS keyboard interface, the use of direct services BIOS printer I/O, read or set the BIOS time and other small ap