Re: Overdrive for the 486/50??

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Article #1131

#1131

From: Keith Smith
Date: Tue, 22 Dec 1992 21:41

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1993 bytes

In article <8f9__KS00WB5Qu_ogq@andrew.cmu.edu> fj05+@andrew.cmu.edu (Faisal Nameer Jawdat) writes:
>msimmons@ec.uwa.oz.au (Michael Simmons - mgmt_staff) writes:
>> Why shouldn't this also work for 486DX/50 (50Mhz clock) -> 486DX2/66 (33Mhz
>> clock)
>
>Well for one thing, the dx50 and the dx2/66 are different chips

The Pin-outs are the same, The voltage LEVEL requirements are the same
at those pins.  The bus speed requirement are LESS on a DX2/66.  You
could run into a PERFORMANCE problem with with swap if you don't have
user programmable wait states and such for the motherboard.

>needing different motherboards, so it's quite possible that to switch
>chips like that could be hazardous...

If you had to de-solder the Crystal, YES.  The last motherboard I got
has is full of jumpers and will take any CPU/speed combo you care to put
on it without messing with the crystal, which I don't seem to see
anywhere on the darn thing.  Moving the crystal DOWN in speed is
unlikely to cause any problems in operation provided the leap is not too
far (like jumping to 2Mhz or something may cause some problems with the
support circuits).  If you are brave enough to de-solder the puppy I'd
suggest re-placing with a 14 pin gold tooled IC socket for an oscillator
IC, and comming up with a socket for any other independent crystal, so
you can put it back later. 

-- 
Keith Smith          uunet!ksmith!keith            5719 Archer Rd.
Digital Designs      BBS 1-919-423-4216            Hope Mills, NC 28348-2201
Somewhere in the Styx of North Carolina ...

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References: <Yf7rijy00WB7RVXdRW@andrew.cmu.edu> <1fumfqINNedv@uniwa.uwa.edu.au> <8f9__KS00WB5Qu_ogq@andrew.cmu.edu>

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Newsgroups: comp.sys.intel
Path: arc1-ca.pugleaf.net!sparky!uunet!rde!ksmith!keith
From: keith@ksmith.uucp (Keith Smith)
Subject: Re: Overdrive for the 486/50??
Organization: Keith's Computer, Hope Mills, NC
Date: Tue, 22 Dec 92 21:41:29 GMT
Message-ID: <1992Dec22.214129.15518@ksmith.uucp>
References: <Yf7rijy00WB7RVXdRW@andrew.cmu.edu> <1fumfqINNedv@uniwa.uwa.edu.au> <8f9__KS00WB5Qu_ogq@andrew.cmu.edu>
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