Hardware
Although there are many demos made for the 48K Spectrums, most current Spectrum demos require the additional features found in the Spectrum 128K, that is, 128 KiB of RAM and the AY-3-8912 sound chip. Also, many demos have been designed to run from a floppy disk rather than a cassette tape.
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.
Read more about this topic: ZX Spectrum Demos
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