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Operating System Specific Discussions => Other Operating Systems => Topic started by: AltRN8 on September 13, 2009, 01:51:25 AM
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I decided to go super esoteric this week and run A/UX on some old apple hardware. I read through compatibility chart and decided to pick up a nice low profile Centris 610 for $20 off of ebay. Of course I was impulse and didn't due my homework as the Centris 610 has only a 68040 LC which I can't run A/UX on.
Fortunately the 68040 on the Centris is socketed and I just need to swap in a full 68040 20Mhz processor. I googled to my hearts content but could not really find any place that had any.
Does any one have any suggestions where I might locate one?
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Maybe a faster full 68040 chip (25mhz seems the most common) would work at 20mhz for you? People overclock all the time, underclocking could be worth a shot.
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Just don't "downclock" too much: Motorola's site states that every CPU have a low and a high frequency limit.
For the 25MHz unit, the lowest possible clock is 28MHz (taken from the '040 datasheet), which will make the CPU run at 14MHz.
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You can easily underclock a higher rated 040 - minimum clock should be somewhere around 5 MHz afair.
[...] The manual (section 11.5) states 20 MHz minimum for all speeds. I believe you could even run below it, but actually any speed grade will do for you.