磁心存储器的存取方式,穿线工艺和线路技术有各种各样的方案。它们在容量、速度和经济性方面都各有优点。线选法速度快,电流重合法较经济,在快速大容量存储器中普遍采用二度半三线方案,而三度三线方案对小容量较适用。随着大规模集成电路技术的发展,国外计算机主存逐渐由半导体存储器所取代。磁心存储器由于速度较慢,只能在大容量和经济性方面寻找出路。如用于主存扩充的磁心存储器,容量在1～8×10~6字节,速度<10μs,每位价格不到主存的1/4[1]。IBM 360的大容量存储器(L.G.S.)周期8.0 μs,容量为一百万字 Core access to memory, threading technology and line technology has a variety of programs. They have advantages in terms of capacity, speed and economy. The line selection method is fast and the current coincidence method is more economical. Generally, the second-half and third-line solutions are adopted in the fast large-capacity memory, while the third-and-third-line solutions are suitable for the small capacity. With the development of large-scale integrated circuit technology, foreign computer memory gradually replaced by semiconductor memory. Due to its slow speed, magnetic core memory can only find a way out in terms of large capacity and economy. Such as memory for the main memory expansion of the core, the capacity of 1 ~ 8 × 10 ~ 6 bytes, speed <10μs, each price less than the main deposit 1/4 [1]. IBM 360's Mass Storage (L.G.S.) cycle 8.0 μs with a capacity of one million words