Home▸ Forums▸ 68kMLA▸ Wanted: Advice on performing 68040 upgrade for Q605 — #22
Post #22 by ojfd
Source Forum68kMLA
CategoryTroubleshooting
Post DateSun, 7 Feb 2010 - 02:05
Original URLhttps://68kmla.org/bb/threads/wanted-advice-on-performing-68040-upgrade-for-q605.19492/
Post
"johnklos", _You can not make it work without the help of PLL chip in any way_!In all Quadras + IIVx this PLL works as Frequency doubler. That means, you put 12.5MHz in and out comes 25MHz. You put 20MHz in -> out comes 40MHz.
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I'm sorry, but how can you tell me that I can not make it work when I've been running at least one of my Quadra 605s at 40 MHz this way for a decade? That doesn't make any sense.
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OK, if you're using 20 MHz oscillator in your mod, would you mind telling me where that 40 MHz signal for the processor comes from?

:-D

ojfd

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