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'[EE]: Is 300 baud still universally supported on P'
2002\11\19@200801 by Russell McMahon

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"Mass mind" knowledge sort ...

On laptops / PCs with RS232 asynchronous serial ports, is 300 baud
capability still universally available?
I'd expect this to be a function of the UART, but there's no telling the
madness that can be managed with a computer.

Has anyone met a system where this is not the case and only higher baud
rates are supported?
If so, what was the lowest supported baud rate?



       Russell McMahon

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2002\11\19@205833 by Herbert Graf

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> "Mass mind" knowledge sort ...
>
> On laptops / PCs with RS232 asynchronous serial ports, is 300 baud
> capability still universally available?
> I'd expect this to be a function of the UART, but there's no telling the
> madness that can be managed with a computer.
>
> Has anyone met a system where this is not the case and only higher baud
> rates are supported?
> If so, what was the lowest supported baud rate?

       I have never seen a PC UART not capable of 300 baud, for basic
compatibility with the original serial port all ports support all "normal"
baud rates, 300 is one of them. TTYL

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2002\11\20@035848 by Alan B. Pearce

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>Has anyone met a system where this is not the case
>and only higher baud rates are supported?
>If so, what was the lowest supported baud rate?

Well my W2k system shows rates down to 75 baud, and includes 110, 134, 150
before getting to 300. I suspect your only problem will be on a non-PC based
system, but suspect that any system will have the basic divider hardware in
there anyway, so doubt it will be a problem.

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2002\11\25@172331 by Peter L. Peres

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300 Baud is supported but there is no 100% guarantee. Anything silicon
implementing a 16550A emulation will allow a divider that goes down to
1/(65536*16) Fclk, Fclk being 1.8432 MHz. Note 'should'. By this measure
the lowest baud rate possible is about 1.76 bauds (just under 2Hz). Which
gives me an idea that I wanted to try out for a long long time and now I
can. Thanks,

Peter

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2002\11\25@180925 by William Chops Westfield

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We were recently surpised to discover that cisco terminal server lines no
longer support 50bps.  In fact, we discovered that they haven't supported
50bps for quite some time now.  Rather embarrassing, since it was a customer
site.  The code actually goes and calculates a divisor based on clockrate
and desired bitrate, and the parser allows down to 50bps for other async
ports that may be present or that might have existed at one time.  But the
resulting divisor just doesn't fit on the modern uarts :-(

BillW

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