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Time-Line computer Archive Ltd is a not for profit company, our aim is to collect, restore and exhibit all types of early computers and electronics.

We hope that our website will give an insight to the development of computing and will help give inspiration to other people to collect rather than throw out historical electronics.

We also would like to make a record of peoples experiences of early Computing and Electronics primarily from Scotland and the North of England but also from Great Britain generally. If you have any Experiences of early computing or Electronics please don't hesitate to contact us.

Memory Store

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Core Memory Store

A core is a small washer of magnetic material which can be magnetised

in either of two directions, thus storing a single binary digit.

Three wires were threaded through each one, when an electric current

flows through two of the wires the core will be magnetised in a direction

dependent on the direction of the current flow.

If not already magnetised in that direction, a pulse would be produced

in the third wire, allowing the memory to be read.

Arthur's main memory consists of 100,000 of these cores, arranged as

2000 words of 50 bits (48 data and two parity).

In modern terminology this is almost 12 Kilobytes.

Yes Kilo, not Mega or Giga!

With it's control electronics, the memory weighs about half a ton.