Re: 486DX2 Crystals

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Article #15812

#15812

From: Roderick Young
Date: Thu, 17 Dec 1992 23:47

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> I purchased a 486 motherboard fitted with a 486DX2 50MHz cpu. Unfortunately
> with no extra cooling the system fails to complete its bootup proceedure.
> The board is fitted with 33.3MHz crystal that can be replaced presumably

> to operate however on contacting the supplier he claimed that the crystal
> frequency didnt matter so long as it is high enough and reckons i need a
> 50 or 80 Mhz xtal which he is posting to me. Is this assumption correct?

Your supplier seems to be uninformed.  You are absolutely right -- get a
25 MHz crystal.  I assume that you mean a crystal can oscillator, and not
just a crystal.  If someone designed their own oscillator, say, with
transistors, then it's possible that the oscillator is tuned to some strange
harmonic, then divided down.

Disclaimer: I don't speak for my company.

- Roderick; HP Personal Computer Division

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From: ryoung@pollux.svale.hp.com (Roderick Young)
Date: Thu, 17 Dec 1992 23:47:23 GMT
Subject: Re: 486DX2 Crystals
Message-ID: <5150066@pollux.svale.hp.com>
Organization: Hewlett Packard CPCD, Sunnyvale CA
Path: arc1-ca.pugleaf.net!sparky!uunet!elroy.jpl.nasa.gov!sdd.hp.com!hpscit.sc.hp.com!hplextra!hpcss01!hpergfg2!pollux!ryoung
Newsgroups: sci.electronics
References: <1g4ul8INN2em@violet.csv.warwick.ac.uk>
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