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platatomi
April 1st, 2012, 04:17 PM
Just wondering if it is possible to upgrade a 68000-based Mac to a 68010. Would it cause any software incompatibilites? Any noticeable performance benefits?

Its a cool concept, thought id ask.

twolazy
April 2nd, 2012, 03:25 AM
I've heard of Mac Classics being upgraded to 68030s. I've even considered doing the upgrade myself, using a powerbook 25/50mhz cpu planar. At the end of the day, ask yourself this, is it really worth all the time and effort? Don't get me wrong, I've hand soldered a 286 cpu to a prototype pcb and soldered that to a 386sx motherboard just to see if it work, btw it does just fine (after swapping crystals, stock one was overclocking it way to high)! To me the answer on my Mac classic though was no... It just make the software run too fast. On my pc on the other hand, it allowed me to get that much closer to original stock speeds. Sadly my 5162 doesn't have it's original motherboard. :(

Question is what is the goal for upgrading?

Chuck(G)
April 2nd, 2012, 08:46 PM
Why bother with the 68010? You're not using the virtual memory capabilities of the '10 in the Mac so the end result doesn't run much faster than the original. An '030 or '020 would give better performance, but the '010 was a little disappointing in the performance department.

commodorejohn
April 2nd, 2012, 08:57 PM
I think the point about the 68010 is it's a drop-in replacement for the 68000 that does give some measure of a performance boost - but you're right that it's not going to be much of one; unless it's a model without a PDS connector, it'd probably be easier (though not necessarily cheaper) to get a proper accelerator.

gslick
April 3rd, 2012, 08:03 AM
There are differences between the 68000 and 68010 exception stack frames. Would that cause any issues?

Chuck(G)
April 3rd, 2012, 08:09 AM
There are differences between the 68000 and 68010 exception stack frames. Would that cause any issues?

I'm guessing that the answer is "probably".

Anonymous Freak
April 3rd, 2012, 10:57 AM
The big issue is that Apple never expected that CPU, so any CPU idiosyncrasies or instruction changes wouldn't be accounted for. That's the same reason nobody has yet successfully gotten a 68060 to run - a few small instruction changes that make it incompatible with the Mac OS.

And, yeah, while the 68030 isn't a drop-in replacement, there are already upgrades for basically every 68000 Mac to bring it up to a 68030, so this upgrade would be silly.