SKU: 92

BIG USSR Soviet Magnetic Ferrite Core Memory plate 1960-s BESM-4 Mainframe Made in USSR in 1960-s (BESM-family computer)
Plate size:
The board outside dimensions: ~ 7 x 7 inch
The frame outside dimensions (without pins): 6 x 6 inch
The dimension of the core plate itself: 5 x 5 inch
Capacity: 1 tiny ferrite toroid = 1 bit
Diameter of 1 ferrite toroid about 1.2 mm (Approx 0.047 inch)
A 64 x 64 core memory plate stores 4096 bits of data or 512 Kb
There are 46 plates in the whole memory block
The frame consists of four parts of an original design assembled through brass plates and eight screws (see pictures attached)
Contacts are silver-platedMagnetic RAM (MRAM) memory modules with ferrite cores with an outer diameter of 1.2 and 1.4 mm were intended for computers БЭСМ-4 / BESM-4 and M-220. Сores of 2 ВТ grade ferrite were produced in Kuznetsk factory of devices and ferrites (the city of Penza)
Offered storage core plate is an early example of magnetic-core storage — devices consisting of an array of magnetic cores.