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Article #115

486sx questions

#115
From: Tim Maceachern
Date: Mon, 27 Jul 1992 13:50
26 lines
2012 bytes
I have a 20MHz 486sx system at home and was wondering if anyone could
help answer the following questions:

   1)  I was hoping to be able to upgrade to a higher speed, full DX
       part at some time in the future.  I imagine being able to buy
       an Overdrive chip which would run internally at 40 Mhz (using
       clock doubling).  Is this achievable now, or will it be in the
       future?

   2)  (This could be posted to other groups, I'd like to keep it in the
       same thread as the previous question).  When running MSDOS 5.0
       the memory manager doesn't seem to recognise the control 
       mechanism for the A20 line on power-up, and refuses to load
       SmartDrive although other TSRs and DOS itself get loaded into
       high memory.  After a few Ctrl-Alt-Dels though, EMM386 does
       recognise the high memory properly.  Once the machine is warmed
       up, each reboot works right.  This doesn't seem right to me,
       I don't think we're talking about a mechanical relay that's sticking
       here..., any ideas what's happening?

*******************************************************************
*         Tim MacEachern         * Tim_MacEachern@hawk.nstn.ns.ca *
*     Software Kinetics Ltd.     *  or maceache@hawk.nstn.ns.ca   *
* Dartmouth, Nova Scotia, Canada *                                *
*           Opinions expressed are the author's only              *
*******************************************************************
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Message-ID: <1992Jul27.135047.13578@nstn.ns.ca>
Path: arc1-ca.pugleaf.net!sparky!uunet!usc!wupost!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!ux1.cso.uiuc.edu!news.cs.indiana.edu!nstn.ns.ca!fox!maceache

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Newsgroups: comp.sys.intel
Path: arc1-ca.pugleaf.net!sparky!uunet!usc!wupost!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!ux1.cso.uiuc.edu!news.cs.indiana.edu!nstn.ns.ca!fox!maceache
From: maceache@fox.nstn.ns.ca (Tim Maceachern)
Subject: 486sx questions
Message-ID: <1992Jul27.135047.13578@nstn.ns.ca>
Summary: Questions about the 486sx
Keywords: 486sx, A20 line
Sender: usenet@nstn.ns.ca (NNTP Entity)
Organization: NSTN Network Operations Centre, Nova Scotia, Canada
Date: Mon, 27 Jul 1992 13:50:47 GMT
Lines: 26