Editing Twistor memory (section)

{{Distinguish|twistor theory}}
{{Short description|Early type of computer memory}}
{{Memory types}}
'''Twistor''' memory is a form of [[computer memory]] formed by wrapping [[magnetic tape]] around a current-carrying wire. Operationally, twistor was very similar to [[core memory]]. Twistor could also be used to make [[read-only memory|ROM]] memories, including a re-programmable form known as '''piggyback twistor'''. Both forms were able to be manufactured using automated processes, which was expected to lead to much lower production costs than core-based systems.

Introduced by [[Bell Labs]] in 1957, the first commercial use was in their [[1ESS switch]] which went into operation in 1965. Twistor was used only briefly in the late 1960s and early 1970s, when [[semiconductor memory]] devices replaced almost all earlier memory systems. The basic ideas behind twistor also led to the development of [[bubble memory]], although this had a similarly short commercial lifespan.