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AuthorTopic: A/UX made me need to source a 68040 20Mhz  (Read 959 times)

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Offline AltRN8

A/UX made me need to source a 68040 20Mhz
« on: September 13, 2009, 01:51:25 AM »
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?
 

Offline tone007

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Re: A/UX made me need to source a 68040 20Mhz
« Reply #1 on: September 13, 2009, 02:19:25 AM »
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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Offline rkauer

Re: A/UX made me need to source a 68040 20Mhz
« Reply #2 on: September 13, 2009, 03:24:30 AM »
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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Offline Zac67

Re: A/UX made me need to source a 68040 20Mhz
« Reply #3 on: September 13, 2009, 10:27:36 AM »
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.