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Date:      Sun, 13 Jul 2008 12:52:11 -0400
From:      Chuck Robey <chuckr@telenix.org>
To:        Warren Block <wblock@wonkity.com>
Cc:        freebsd-chat@freebsd.org, Christian Weisgerber <naddy@mips.inka.de>
Subject:   Re: 50 baud is dead
Message-ID:  <487A32BB.1040306@telenix.org>
In-Reply-To: <alpine.BSF.1.10.0807130945370.94782@wonkity.com>
References:  <g58mmb$16sj$1@kemoauc.mips.inka.de>	<200807121018.39240.doconnor@gsoft.com.au>	<g5a2p4$1uuu$1@kemoauc.mips.inka.de>	<200807131004.43681.doconnor@gsoft.com.au> <alpine.BSF.1.10.0807130945370.94782@wonkity.com>

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Warren Block wrote:
> On Sun, 13 Jul 2008, Daniel O'Connor wrote:
> 
>> On Sat, 12 Jul 2008, Christian Weisgerber wrote:
>>> Daniel O'Connor <doconnor@gsoft.com.au> wrote:
>>>>> It turns out that uplcom(4) adapters don't support the required
>>>>> speed of 50 baud anymore.
>>>>
>>>> You know, it might actually support it if you hack up the driver.
>>>> The source says the PL2303X "can set any rate".
>>>
>>> The data sheet disagrees.
>>>
>>> "The flexible baud rate generator of PL-2303X could be programmed to
>>>  generate any rate between 75 bps and 6Mbps."
>>
>> I guess you're out of luck then :(
> 
> Or just try it at 75 and see if there's enough slop to read the 50 baud
> data.

There won't be, 50% is way too far off, I think (from experiments I did 30 years
back) that about 12% is the limit, when I had access to the best regenerators.
Regens don't even get used anymore.  I forget the actual limit I probed, but I
know 1/2 over is way too far to go.


> 
> -Warren Block * Rapid City, South Dakota USA
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