Kvantor Soviet Spectrum Clone
This computer arrived at the museum with almost no information as to its history, so we put out an appeal on social media. It is with many thanks to all those who responded that we now have the information below. If you have any further information about this, please provide it, along with references, via the 'Comment on this page' link below.
This is a ZX Spectrum clone made in Severodonetsk, Ukraine by the company Quantor (НПО "Квантор"). The main board is a Kvantor perhaps based on the Leningrad, a self assembly board popular with hobbyists.
The machine has a switch on top for going between 48K and 128K modes, a 64-pin connector at the rear, a 96-pin one, an attached 5-pin DIN on a cable, and two 6-pin DIN also.
In Soviet clones, the 5-pin DIN is usually used as tape recorder interface (in and out). 6-pin DIN might be power (VG93 required +5V, +12V), or Kempston joystick interface
The memory chips are soldered in two layers, so it was originally 48K, but has had the 128k model's AY chip added. It has been heavily modified with keyboard and Beta-disk interface. It somewhat looks like a prototype. The PCB has been manually extended, but the computer has an industrially produced case with professional looking labels for the memory toggle switch, name and model.
There is most likely TR-DOS in one of the ROMs, and there are interesting green decoupling capacitors - wires coming out the sides of a square package.
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This exhibit has a reference ID of CH60804. Please quote this reference ID in any communication with the Centre for Computing History.