Any demand for 060 boards for A1200's?

[Damion]

@voytech

I have read that genuine 66MHz rated 68060s can be overclocked to 75MHz provided you install some serious cooling.

I've tried to overclock my 66mhz B1260, but even
with good cooling the chip will wig out and
cause gurus at anything above 66mhz (I've tried
70, 72 and 74mhz with no luck). The proc is
a 60mhz unit, which most manufacturers clock to
66mhz (the 66mhz chips from Motorola are all
FPU-less).

The best for overclocking are actually the
latest mask revision of the 50mhz chips...one
of those clocked at 72mhz with a decent cooler
would probably be the best/most reliable 060
setup.

-edit-

The 66mhz Apollo boards are either overclocked
50 or 60mhz full 060's, so for the right price
they're really not that bad...I'd probably
buy one if it had one of the "later" 50mhz
procs on it.
 

[Damion]

Interesting...according to this site:

http://www.czuba-tech.com/CT60/english/overview.htm

68060's with the 'E41J' mask revision can
handle up to 100mhz! I don't think there are
any amiga cards which use this chip, most of
them (like mine) have the old '1F43G' mask, or
the slightly less-old 'G65V' mask (they are those
chips whose part numbers end in "A", and can
handle up to about 80mhz).

It may make an interesting project to source one
of these chips and try it out at perhaps 90mhz
or so...

Here is the info from Motorola's site about the
'E41J' mask:

http://e-www.motorola.com/files/shared/doc/pcn/945048375992collateral.html

And here is some info on the previous mask (those
with the "A" suffix):

http://e-www.motorola.com/files/shared/doc/pcn/PCN2401.html