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I didn't want to come across as a fanboy, having already mentioned the C64 a few times in comments under other topics. The C64 does make a small appearance in the graph.
But if the topic is computers for the masses the C64 certainly should be mentioned as Jack Tramiel wanted to keep it relative low cost to allow more people to buy it. The ZX81 was affordable for the masses, the ZX Spectrum/C64/Amiga/Atari computers were bought by masses.
Maybe Linux should get a mention too, an operating system so cheap anyone can afford it and it runs on all kinds of hardware.
It kind of seems the writer just wanted to jump to the points he wanted to make about the more recent stuff.
But to be fair, it would make a very long article if he gave everything its credit.