Subject: Re: PC164 questions
To: Thor Lancelot Simon <>
From: Lars <>
List: port-alpha
Date: 06/27/2002 19:39:46
On Wed, 19 Jun 2002, Thor Lancelot Simon wrote:

> On Tue, Jun 18, 2002 at 10:33:32PM +0200, Jochen Kunz wrote:
> > Hi.
> > 
> > Today arrived the ePayed PC164 board. Naked. No RAM, 533MHz CPU but no
> > heat sink. I jumpered the board to 128 bit memory bus, threw in 4 x 16MB
> > parity PS/2 SIMMs, mounted a heat sink, pluged a TGA2 in, keyboard, ATX
> > PSU, powered it on and - nothing. Even the CPU didn't get warm. I
> > noticed that unused CPU fan connector and there was somthing...
> How exactly did you mount a heat sink?  The 21164 uses a very specific
> heat sink design and I can't imagine any standard sink fitting nor
> working working well.  The correct sink needs to be mounted using a new
> grafoil gasket, the correct aluminum nuts on the studs that come out of
> the CPU package, and the correct torque.
> Also, are you sure you have the right CPU?  I know of 533MHz 21164PC
> parts, but a 533MHz 21164A?  I wasn't aware they made those.  The AlphaPC
> 164 motherboard requires a 21164A CPU.

I have a 21164A 533MHz CPU on my 164LX mainboard so i guess the exist,

> > How does the board detect the CPU fan? Is it enough to short the sense
> > pin to GND? Or is a signal needed with a RPM proportional frequency?
> > 
> > I also noticed that there is no clock crystal U34. Is it normal that
> > this is missing? If not, is it a pure crystal or a complete quartz
> > oscillator with TTL level output? Is it really 36.666MHz? Not 33.333MHz?
> It's not normal that the oscillator would be missing.  I'm not sure you're
> going to be able to get everything you need to make a board as stripped as
> the one you have functional.
> > How do I jumper the board to 533MHz? The manual stops at 433MHz. If I
> > extrapolate the jumper settings I get 500MHz at "Out Out Out Out" = CPU
> > int / ext 15 / 1. How do I get multiplicator 16? 
> I don't think you do; again AFAIK, the correct CPU for this board would be
> a 500MHz 21164A.
> -- 
>  Thor Lancelot Simon	                            
>    But as he knew no bad language, he had called him all the names of common
>  objects that he could think of, and had screamed: "You lamp!  You towel!  You
>  plate!" and so on.              --Sigmund Freud

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