New CPU Installed

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 03/13/2016 at 23:272 Comments

The Freescale MC68040FE33A is now installed. It's so much easier to solder a QFP with clean and straight pins.

It's still not showing up as a full 68040 with an FPU. The part datasheet says it has one:

I noticed on installing this CPU I needed to do a PRAM reset before it would boot. Hmm.

I dunno... I'll get it on my network and try to find a more through system diagnosis/benchmarking tool than System Profiler.


Galane wrote 03/21/2016 at 09:10 point

Look for Apple Personal Diagnostics

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john wrote 03/21/2016 at 07:15 point

Boot NetBSD. If it really is a Freescale CPU, then FPU trap handling won't be broken. If programs dump core now and then, you know you have an older CPU which has been relabeled.

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