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Xref: sserve comp.sys.ibm.pc.hardware.chips:16976 comp.sys.ibm.pc.hardware.comm:6642 comp.os.386bsd.misc:5100 Path: sserve!newshost.anu.edu.au!harbinger.cc.monash.edu.au!bunyip.cc.uq.oz.au!munnari.oz.au!spool.mu.edu!sol.ctr.columbia.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!uwm.edu!news.moneng.mei.com!brasil.moneng.mei.com!not-for-mail From: jgreco@brasil.moneng.mei.com (Joe Greco) Newsgroups: comp.sys.ibm.pc.hardware.chips,comp.sys.ibm.pc.hardware.comm,comp.os.386bsd.misc Subject: Re: Re-clocking a 16550 for 230,400? Date: 27 Jan 1995 14:14:07 -0600 Organization: Marquette Electronics, Inc. - Milwaukee, WI. Lines: 21 Message-ID: <3gbk6f$2tt@brasil.moneng.mei.com> References: <3g8agg$19h@brasil.moneng.mei.com> <3ga99c$ms3@kaiwan.kaiwan.com> NNTP-Posting-Host: brasil.moneng.mei.com In comp.sys.ibm.pc.hardware.chips article <3ga99c$ms3@kaiwan.kaiwan.com>, mzapka@kaiwan.com (Michael B. Zapka) wrote: :You're right it will work (provided the support chips can take it, but :230k shouldn't be a problem). But the problem will be all of your :existing software will not work correctly due to the serial divisors :will be off by a factor of two. If you're doing your own program or have :a program which you can enter the divisors.. no prob... (Or just know :that your term entry of 115.2k is really 230.4k.) I hacked up a pair of STB DSP/550 cards early yesterday, we had the 3.6864 MHz crystals in the lab but not the 7.3728 MHz crystals, so I only doubled the clock. :-) They seem to work fine. Remembering that the real speed is twice the listed speed is a very, very small price to pay, and was of course an expected side effect of this sort of hardware upgrade... :-) ... Joe ------------------------------------------------------------------------------- Joe Greco - The Data Capture Fellow (and UNIX/Network Hacker) 414/362-3617 Marquette Electronics, Inc. - Milwaukee, WI jgreco@brasil.moneng.mei.com