A Historical Perspective Long evolutionary development Started from rather primitive 16-bit processors Added more features Take the advantage of the technology improvements Satisfy the demands for higher performance and for supporting more advanced operating systems Laden with features providing backward compatibility that are obsolete | aden with:承载 compatibility;:兼容性 大 obsolete:陈旧的10 A Historical Perspective • Long evolutionary development – Started from rather primitive 16-bit processors – Added more features • Take the advantage of the technology improvements • Satisfy the demands for higher performance and for supporting more advanced operating systems – Laden with features providing backward compatibility that are obsolete * laden with:承载 * compatibility: 兼容性 * obsolete:陈旧的