Sinclair-URSS

Blic

Early version

Last version

The HC series of computer were built at a company called Ice Felix founded in 1970, located in Bukarest (Bucuresti). The Company still exists and even has a (web page with some valuable information (HC85=1985/HC2000=1993). As far as I know all HC machines were Sinclair Spectrum clones, built arround the Zilog Z-80 processor. I am not sure if it was a original Z-80 or a east-european clone.
HC85
Introduced in 1985 the HC85 was the first machine of the HC line. It has to load its basic interpreter from tape - there was no floppy disk available. The keyboard is said to be quite bad.
From [Old-Computers.com] I learned that there were two versions of the HC-85 - the older one in the classic-syle an a modern-version that looks like the HC-90. The classic-version seems to be the rarer one. According to Stefan Marinescu it had the BASIC interpreter in the ROM, so it did not load anything like that from casette - perhaps this is different for the old and the new version? We have to find out ....

HC88
According to Bogdan Bordea there also was a HC-88 (same case as the HC-85) with CP/M support.

HC90
Unlike the HC85 the HC90 has a built in Basic-Interpreter.

HC91
Built arroud 1991 the HC91 was just a facelife for the HC90. From [Old-Computers.com] I learned that there were two versions of the HC-91 - one with a 40-key version with a HC-90 flat-keyboard an a newer 50-key version with a better (more typwriter like) keyboard. The circuit diagramm is also different.

HC2000
In 1993 the HC 2000 was launched - the last and the best of the HC machines. It came with a built in disk-drive (double density, 720kB) - there was also a version of the HC2000 with a built in tape recorder. The floppy-disk version of the HC2000 was able to load a CP/M operating system (you had to type PRINT USR 14446 command at the BASIC prompt).

Олимпик-С

The Sprinter (also called ZX-Sprinter) is a microcomputer made by Russian Peters Plus, Ltd.; it is the last model of ZX Spectrum being produced in a factory. Its built using what the company calls a Flex architecture.
This uses an Altera PLD as part of the core logic, allowing the machines hardware to be reconfigured on the fly for several ZX-Spectrum models compatibility or its own enhanced native mode (hardly used). This is comparable to the design of Jeri Ellsworths C-One reprogrammable computer.

The Sprinter in one of its modes runs the Estex operating system but mainly it works in many modes of the Sinclair ZX Spectrum home computer of the 1980s (with TR-DOS Spectrum system on-board).