7.5.5 + OpenTransport?

A project log for 68040 upgrade for Powerbook 520c

Unsoldering and resoldering a 180-pin QFP! Thrills! Excitement! A full 68040 in a Powerbook 520c!

hackadayhackaday 02/19/2016 at 16:171 Comment

Still no luck getting AppleTalk shares to show up in the chooser on the powerbook. I'd heard 7.5.5 + OpenTransport was needed to get things working, but it's not working yet. Worse yet, I've upgraded myself to a place where netscape 3.0 no longer is happy running. It complains it is out of resources. I may have to try tearing out extensions and see if I can get enough RAM back.

I dug around for some other testing utilities and found a newer one which also claims there is no FPU present. I was hoping it was just my ancient copy of Norton Utilities which was wrong.

So, I'm still holding out hope it's a System Enabler issue which will go away at OS 8.1, but there's a growing possibility I was sold a re-labled 68LC040.

No luck finding another appropriate 68040 online either. Right now the ebay sellers either have crack-pipe pricing or poor feedback and won't answer questions.


Galane wrote 02/24/2016 at 23:43 point

You need Jump Development RAM Charger. Then instead of Apple's virtual memory use RAM Doubler but with only the virtual memory function enabled. RAM compression is pretty much useless.

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