Diablo daisy wheel models

Hi all – Where can I find out more about the Xerox Diablo 600-series printers? The 630 seems pretty famous, but I keep into references to a 635 and 640, presumably the successor models. I’m interested in technical details, and probably an acquisition. My searches haven’t yielded much on the later two models.

I’m interested in knowing more about their other models. Does anyone know what the difference is between the Diablo HyType II (1979?) and the 630 (1980)? I think they were only a year apart, so given their naming I’m curious if they were fundamentally different model lines or something.


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