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From: pajerek@usenet@kadsma (Don Pajerek)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Can you speed up an old 6Mhz IBM-AT to 12Mhz?
Message-ID: <1990Jul6.115246.13641@usenet@kadsma>
Date: 6 Jul 90 11:52:46 GMT
References: <6692@vax1.acs.udel.EDU> <57993@bbn.BBN.COM> <3816@rodan.acs.syr.edu>
Reply-To: pajerek@isctsse.UUCP (Don Pajerek)
Organization: Eastman Kodak Telecommunication Services, Rochester, N.Y. 14650
Lines: 20

In article <3816@rodan.acs.syr.edu> amichiel@rodan.acs.syr.edu (Allen J Michielsen) writes:
>In article <57993@bbn.BBN.COM> sher@labs-n.bbn.com (Lawrence D. Sher) writes:
>>In article <6692@vax1.acs.udel.EDU> bach@vax1.udel.edu (Baskaran Subramaniam) 
>>>Is it possible to speed up an old 6Mhz IBM-AT (not a compatible) to 12Mhz
>>>by changing the crystal in it?
>>The Isa bus has
>>practical upper limit of just about 8 MHz.
>  If the at bus has a practical upper limit of just about 8 Mhz, then all the
>clone 10 & 12 Mhz bus computers must not work.
>al

A lot of clones run the processor at 12, 16, or 20 mHz, and the bus at
8 mHz. This does away with your objection.

However, this doesn't help someone who just wants to take an existing
6 mHz AT and crank it up to 12.  It probably won't work.  Better stop
at 8.


Don Pajerek