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Topic: Core rope memory

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Magnetic core memory

Twistor memory

Computer memory

Thin film memory

Delay line memory

Random access memory

Cache memory

NVRAM

Flash memory

UNIVAC 1107

Ferrite

Disk storage

MOBIDIC

EPROM

Punch card

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	Magnetic core memory
		Core memory was part of a family of related technologies, now largely forgotten, which exploited magnetic properties of materials to perform switching and amplification.
		Early core memory systems had cycle times of about 6µs, which had fallen to 1.2µs by the early 1970s, and by the mid-70s it was down to 600ns (0.6µs).
		A characteristic of core was that it is current-based, not voltage-based.
	www.sciencedaily.com /encyclopedia/magnetic_core_memory (1748 words)

	Computer storage - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-10-09)
		Cache memory, which is often built into the microprocessor, hard drives, or other devices, a small amount of very high speed dedicated memory* used so that important parts of a computer can work at full speed without having to constantly request information every time from slower devices or the rest of the system.
		An analogy is to think of the storage as human memory, with the hard disk as long-term memory, and the RAM as short-term_memory.
		Historically, "memory" referred to "magnetic core memory" in the 1950s, and then to semiconductor-based storage in the 1970s, at a time when the fastest response times were for magnetic core, and then for semiconductor memory, respectively.
	encyclopedia.worldsearch.com /computer_storage.htm (870 words)

	Apollo Guidance Computer and Other Computer History
		A small prototype memory was built, and has achieved read cycle times of one microsecond, information access times of 0.3 microseconds, and a write time of 4 microseconds.
		For example, assigned memory addresses in the scratch-pad memory are used in place of the several arithmetic registers such as A, Q, and X, and counters, such as velocity and incremental accumulators required by conventional computers.
		Since large numbers of wires could be threaded through a core, the gates had a very high fan in to go along with their high fan out.
	klabs.org /richcontent/Misc_Content/AGC_And_History/AGC_History.htm (10441 words)

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		It was as if the organizational core had melted down, and companies that couldn't adjust fast enough — or that were culturally unwilling to shift gears — went belly up as a result.
		I knew next to nothing about machine intelligence, but I was fascinated by its core concept of "knowledge engineering." The challenge was to model how people understand things, represent ideas, and communicate them to others.
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	01Glossary
		Bubble memory was developed in 1967 at Bell Laboratories by A. Bobeck.
		Bubble memory devices were constructed of garnet chips in which the data-storage "bubbles" are a few microns wide.
		The Elliott 903 was manufactured by Elliott Automation Limited from 1965 as a desk-sized successor to the military computers 920B (in Nimrod Mark I) and 920M (in RAF Jaguars and in tanks).
	www.computermuseum.li /Testpage/01HISTORYCD-Glossary.htm (16322 words)

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