Overclocking CMOS 68000 CPUs

[Iggy]

How overclockable are CMOS 68K based parts?
I have seen a lot of data on '030, '040, and '060 parts, but what about the
MC68HC000 or MC68HC001.

I could really use parts like those running in the 40MHz range.

[Iggy]

Good question - 68SEC000 on Minimig runs at ca 50MHz and it is not even luke warm

Great! Since I just logged in to edit the first message with something like "And what about the MC68SEC000?"

Can anyone point me to a source of MC68SEC000 chips that will run at at least 40MHz?

And does the MC68SEC000 still retain the E output of the  MC68HC001?

Edit: Scratch that second inquiry.
The MC68SEC000 does not appear to have the E output of the  MC68HC001.
Not a big deal, I just have to upgrade some of the components I have in my current design.

Still, high speed MC68SEC000s, anyone?

[Iggy]

The only 20 MHz 68SEC000 I can find is the MC68SEC000AA20.

Again, does anyone know what might be used in a Minimig?

[Iggy]

If you finish your project could you share with others?

Ah, it started out as a weird speculation that I could create the needed quadrature clock for an HD63C09E running at 3.58 from the E output of an MC68HC001 if I could get one to run at 35.80 MHz.

Just a weird project that would run dual 8/16 and 16/32 bit cpus in lock step.

It has mutated seriously into multiple idea so I have no idea what I might report.

As an Amiga accelerator, the '030 makes vastly more sense thanks it its much higher throughput at comparable clock speeds.

OK, so no "FU".

Any suggestions on possible replacements?

[Iggy]

One that everyone was surprised to find working perfectly well at speeds close to 60MHz, hehe. I can have a look tomorrow, left mine at work.

I'd like to see that.
I am getting wildly varying reports on what these chips will do.
But 60MHz doesn't surprise me.
The '060 did it, so why not?