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From: ong@d.cs.okstate.edu (ONG ENG TENG)
Newsgroups: comp.sys.ibm.pc.hardware
Subject: Re: Change clock speed on 386SX motherboard?
Message-ID: <1991Jan7.215614.8068@d.cs.okstate.edu>
Date: 7 Jan 91 21:56:14 GMT
References: <1991Jan6.224718.14039@xrtll.uucp>
Organization: Oklahoma State University
Lines: 25

Well, folks, looks like I am gonna plunge head-first into this
speedup 16-to-20 deal.  Since I already have DRAM fast enough
for 20MHz operations and has been informed (no I won't hold you to
it!) that 386SX-16 can very well run at 20MHz, the only thing I 
need is the optional 40MHz oscillator (for the 20MHz operation).

I have found 2 sources for them:  at JDR Microdevice catalog (whom
I deal with from time to time for both PC cards and I.C., etc) with
the description of Oscillators part# OSC40.0 at 40.0MHz, casing
type of OSC ($4.95).  The only problem is that they did not display
a picture of OSC casing.  The type of casing on the optional
oscillator slot into the PC is kind of like a 8-pin I.C. BUT with
rounded pins that are NOT pertruding outsider the length or width of
the casing (but rather only downwards).  The other source is
Digi-key with whom I only dealed with once (service great but 
price? Hmmm...).  They have 2 items which might go into my PC
the first being a Full Range Quartz Crystall Oscillator part# X120 at
40.0000MHz ($4.26) and Clock Oscillator part# CTX12040.000MHz ($4.40).  
Both have the diagram of the casing and it seems both will fit into the PC
optional oscillator slot.  Anyone has any idea which one I should go
with?  

Thanks in advance.

E. Teng Ong (ong@d.cs.okstate.edu)