7.1.1 Five requirements(6/6) 5. Physica| Organization(物理组织) Memory is organized into at least two levels, referred to as main memory and secondary memory Memory available for a program plus its data may be insufficient(内存对程序和其数据来说可能不足) Overlaying(覆盖) allows various modules to be assigned the same region of memory Programmer does not know how much space will be available and where his / her program will be loaded in memory11 7.1.1 Five requirements(6/6) • 5. Physical Organization(物理组织) • Memory is organized into at least two levels, referred to as main memory and secondary memory • Memory available for a program plus its data may be insufficient(内存对程序和其数据来说可能不足) • Overlaying(覆盖) allows various modules to be assigned the same region of memory • Programmer does not know how much space will be available and where his/her program will be loaded in memory