USSR Magnetic Core Ferrite Memory Board on 64 ferrite-diode cells 16 byte SKU 17 For Sale
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USSR Magnetic Core Ferrite Memory Board on 64 ferrite-diode cells 16 byte SKU 17
Price: US $89.00
SKU: 17.1
Unique on instance of ancient “tubeless” computer memory element Ferrite Memory Board on ferrite-diode cells made in the USSR
Cell number: 64 A cell contains 2 ferrite cores. Hence the Board stores 16 byte. Dimension: 22 x 22 x 2.5 cm (about 8.7 x 8.7 x 1 inches) Weight: 575 g (about 1.27 pounds)
CONDITION: good vintage condition.
A ferrite-diode cell is a pulse element of automatics and computer equipment made on one or several ring ferrite cores with a rectangular hysteresis loop and a semiconductor diode. The core remembers and for some time stores information in binary code; the diode performs mainly the functions of the spacer element. Recording and reading of information are made by current pulses, fed to the recording windings (input) and readings (polling), respectively. Several ferrite cells, connected in a certain way, may be assembled to Logic element, Register, Threshold element, Memory element.
Ferrite-diode cells were used, from beginning of the 50s of the 20th century in mainframes and in some automation devices, later replaced by more advanced ferrite-transistor cells. The scheme of the simplest ferrite-diode cell (Pic 12):
