*BSD News Article 41815


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From: mzapka@kaiwan.com (Michael B. Zapka)
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 08:01:48 GMT
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In article <3g8agg$19h@brasil.moneng.mei.com>, 
jgreco@brasil.moneng.mei.com says...
>
>I've looked over all the data sheets.  I've looked through a bunch of 
Usenet
>FAQ's.  I've looked at the sources for my OS's serial device drivers.
>
>Problem:  I need a 230,400 bps serial port.
>
>Somebody's suggested solution:  Buy a Hayes high speed serial card, and
>        select the "4x clock" option.

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.)