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From: ching@brahms.amd.com (Mike Ching)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Can you speed up an old 6Mhz IBM-AT
Message-ID: <1990Jul14.155505.291@amd.com>
Date: 14 Jul 90 15:55:05 GMT
References: <6692@vax1.acs.udel.EDU> <1227200017@EN-C30.Prime.COM>
Sender: usenet@amd.com (NNTP Posting)
Organization: Advanced Micro Devices; Sunnyvale, CA
Lines: 15

In article <1227200017@EN-C30.Prime.COM> JDM@EN-C30.Prime.COM writes:
>
>From what I read, it should be possible to upgrade a 6mhz XT to 8mhz by
>changing the crystal to a 16mhz clock. If you go past 8mhz you tend to
>overrrun the system, as normal XT memory is not fast enough (need 120ns
>to do it) and unless you have a non-IBM supplied disk and controller,
>you'll spend a lot of time waiting around anyway (since XT disks are
>not real fast).


There's a mixture of AT and XT in the header and body of this article.
An AT uses a 2x crystal so it's a 16MHz crystal to run at 8MHz. An XT
uses a 3x crystal so you need a 24MHz crystal to run at 8MHz.

Mike Ching