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In page ZX Spectrum demos:

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In many eastern European countries, the various Spectrum clones used to be more common than the original models, a fact that also reflects in the choices of hardware among the demoscene. For example, on most Russian demoscene events, the standard "compo Spectrum" is the Pentagon 128 with a floppy disk drive. Since there are considerable technical differences between the Pentagon and the original Spectrum, particularly in the video timing, there are also many demos that require a Pentagon to run properly. Piotr Marecki cultural studies and digital culture scholar at Jagiellonian University argues that this makes the ZX Spectrum demoscene unique.[2]