NetBSD Shows No FPU

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 08/07/2016 at 17:461 Comment

I finally got around to booting the laptop with NetBSD. I used the booter application and a net install .gz image file. The kernel reports the FPU is being emulated. I'm sure if this is due to booting from inside MacOS or not. I've tried getting it to boot natively from the hard drive but it seems my power adapter is going bad - it is cutting power to the machine randomly.

I think it's definitive - you can't upgrade a PowerBook 500-series to a full FPU CPU and have it work properly.


john wrote 04/05/2019 at 23:34 point

I can tell you with certainty that NetBSD does not rely on Mac OS to determine whether there's an FPU, so that CPU really doesn't have an FPU.

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