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Cyrix got absorbed into National Semiconductors. They sold the CPU business off to VIA very soon after, while they kept the integrated-CPU branch until very recently, when it got sold off to AMD.
VIA in turn acquired Cyrix CPU business about at the same time as they bought the WinChip team off IDT. Cyrix's then hottest chip, the M-III, made it into sample state, but then was dropped in favour of the WinChip architecture for various reasons - Cyrix engineers leaving by the dozen, problems making the M-III at useful speed grades, these things. Meanwhile, the WinChip had successfully been migrated from socket-7 to socket-370, still a small die, cheap to manufacture at good yield, albeit with much worse per-clock performance than any other CPU.
So the "Cyrix III" that actually made it onto retail shelves wasn't a Cyrix at all, it was a WinChip. The latter line has been continued to today's VIA processors, while the Cyrix legacy is gone, all that remains being a shedload of patents and brilliant ideas. VIA since emphasize on the WinChip's strength - small die size, low power consumption.
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