SKU: 89.x
USSR Magnetic Ferrite Core Memory Double Frame Board Kbyte ES EVM 1970s
Excellent vintage condition. Please see pictures provided at eBay picture gallery.
Please, note, last photo at eBay picture gallery is shown for demonstration purposes only. The whole cube is not for sale.
Ferrite Core Memory Board manufactured in the USSR in 1970s
Board size: about 4.3" x 4.3"
Weight: about 3 oz
Capacity: 1 tiny ferrite toroid = 1 bit
A 64 x 32 x 2 core memory matrix stores 4096 bit of data.
Two core matrices store 8192 bit of data or 1 Kb.
CONDITION: Good vintage condition. No missing or damaged ferrite rings. No broken copper wire. There are remnants of protective varnish on the case (both sides).
Please see pictures attached!
The Board has technically complex design: two memory planes are separated by Micarta circuit plate. Ferrite core matrices are placed on aluminum varnished foil base from the both sides of the plate. 64 coordinate wires pass in the matrix along the "X" and 64 ones along the "Y", forming an address grid of 64 x 64 and also sense and inhibit windings are thread through each core.
A whole RAM memory cube is shown on Pic.11 for illustration
Offered storage core plate is an early example of magnetic-core storage — devices consisting of an array of magnetic cores.
Condition:
Very good, clean, well preserved, vintage condition.
Please, note:
On the board, there are two identical matrixes of ferrite rings: below and above. Each matrix has 64 x 64 = 4096 rings. Since there are two matrixes, the total sum of rings is 8192 rings. 1 ring - 1 bit of information. That is, there are 8192 bits of information in total. "A kilobit (kbit) is a unit of measurement of the amount of binary information, equal to 1000 bits. Often confused with a kilobyte, equal to 210 bytes = 1024 bytes = 8192 bits." So, for this reason we say that this plate has exactly 1 Kilobyte = 8192 bits. That is, as I believe since there are 8192 rings on the board, there is only 1 KB on it.
As for the computer from which the memory plate was removed, unfortunately, I have no information, except that it was a computer for military purposes. The cube where the board was located had a decimal number starting with TY, which indicates the Research Institute of Automatic Equipment named after Academician V.S. Semenikhin as the developer. Year of manufacture 1979.