The first RAM integrated circuits became available in 1972 at 1 cent per bit, quickly making magnetic core memory obsolete.

第一个 RAM 集成电路于 1972 年以每位 1 美分的价格面世，很快就使磁芯存储器过时了。

However, delay line memory was largely obsolete by the mid 1950s, surpassed in performance, reliability and cost by a new kid on the block: magnetic core memory which was constructed out of little magnetic donuts, called cores.

然而，延迟线存储器在 20 世纪 50 年代中期已经基本过时，在性能、可靠性和成本方面被一个新产品超越：磁芯存储器， 它由称为磁芯的小磁性甜甜圈构成。