Magnetic-core memory

A 32 x 32 core memory plane storing 1024 bits of data.

Project Whirlwind core memory, circa 1951

Diagram of a 4×4 plane of magnetic core memory in an X/Y line coincident-current setup. X and Y are drive lines, S is sense, Z is inhibit. Arrows indicate the direction of current for writing.

Close-up of a core plane. The distance between the rings is roughly 1 mm (0.04 in). The green horizontal wires are X; the Y wires are dull brown and vertical, toward the back. The sense wires are diagonal, colored orange, and the inhibit wires are vertical twisted pairs.

Magnetic-core memory was the predominant form of random-access computer memory for 20 years between about 1955 and 1975. Such memory is often just called core memory, or, informally, core.

Core uses tiny magnetic toroids (rings), the cores, through which wires are threaded to write and read information. Each core represents one bit of information. The cores can be magnetized in two different ways (clockwise or counterclockwise) and the bit stored in a core is zero or one depending on that core's magnetization direction. The wires are arranged to allow for an individual core to be set to either a one or a zero and for its magnetization to be changed by sending appropriate electric current pulses through selected wires. The process of reading the core causes the core to be reset to a zero, thus erasing it. This is called destructive readout. When not being read or written, the cores maintain the last value they had, even when power is turned off. This makes them nonvolatile.

单词	Magnetic core memory
释义	Magnetic core memory 原声例句科技 Crash Course 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。科技 Crash Course While great for storage, this was not nearly fast enough for memory, so the RAMAC 305 also had drum memory and magnetic core memory. 虽然这对于存储来说非常好，但对于内存来说速度还不够快，因此 RAMAC 305 还具有磁鼓内存和磁芯内存。科技 Crash Course This was a killer feature, and magnetic core memory became the predominant Random Access Memory technology for two decades, beginning in the mid 1950s even though it was typically woven by hand! 这是一个杀手级功能，从 1950 年代中期开始，磁芯存储器成为主导的随机存取存储器技术长达 20 年之久，尽管它通常是手工编织的！科技 Crash Course 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。英语百科 Magnetic-core memory Magnetic-core memory was the predominant form of random-access computer memory for 20 years between about 1955 and 1975. Such memory is often just called core memory, or, informally, core. Core uses tiny magnetic toroids (rings), the cores, through which wires are threaded to write and read information. Each core represents one bit of information. The cores can be magnetized in two different ways (clockwise or counterclockwise) and the bit stored in a core is zero or one depending on that core's magnetization direction. The wires are arranged to allow for an individual core to be set to either a one or a zero and for its magnetization to be changed by sending appropriate electric current pulses through selected wires. The process of reading the core causes the core to be reset to a zero, thus erasing it. This is called destructive readout. When not being read or written, the cores maintain the last value they had, even when power is turned off. This makes them nonvolatile.
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Magnetic core memory

Magnetic-core memory