Re: FPU problems

From: Jo Even Skarstein <joska_at_nuts.edu>
Date: Wed, 1 Apr 1998 19:08:42 +0100

On Wed, 1 Apr 1998, Michael Grove wrote:

> the 040:). I am working on a Falcon (C-LAB/PAL) that bombs when the FPU
> is accessed. The machine dosen't lock up, just haults and exits the
> software with a screen full of bombs. I have checked the buffer mod,
> signal/power to the FPU and replaced the PALs. The diagnostics cart only
> checks to see if an FPU is present, and reports back ok. I tried
> GEMBENCH, FPUBENCH and NEMBENCH.

You're not the only one with this problem, I had it as well when I had
a FPU. For some reason my FPU only worked in 24MHz, and not 16 or 20!
I solved this simply by feeding the FPU directly with a 50MHz clock,
this worked fine.

Unfortunelately I can't remember which pin I fed, I *believe* it was
pin 11. Geir Řyvind is the one to ask here.


/*
** Jo Even Skarstein http://www.stud.ntnu.no/~josk/
**
** beer - maria mckee - atari falcon - babylon 5
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Received on on. april 01 1998 - 19:08:42 CEST

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