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the 810 and 1050 specifically, ran at 288 RPM rather than 300. I can't imagine why this might be, I do believe it was needed to securely store 18 sectors per track while using the WDC1771 at 1 MHz feed by a 6507 at 500 kHz. It might have been a sweet spot for components, with slowing down the drive (zero part cost) enabling some savings. Worth noting that ...


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