Re: serial port real versus effective speeds

[cstrobel crosslink net]

You may want to check if "gpm" is running.  It is sometimes started as a
serial mouse driver among other things.  Maybe ps ax|grep gpm will work.


On Mon, 26 Jun 2000, A. R. Vener wrote:

> 
> Hi,
> 
> I'm giving emacspeak a rest for now after many long
> and frustrating hours with it. For me the learning
> curve is not worth the loss of productiveity I'd have 
> to endure until I figure out all its idiosyncrasies.
> 
> I've finally set up my Caldera system to use a serial
> port to connect to a DOS box running Telix and Vocal Eyes.
> 
> After several false starts this process finally boiled down
> to the following step:
> 
> Edit the /etc/inittab file and add this line after the
> existing getty lines:
> 
> s7:2345:respawn:/sbin/getty /dev/cua0 default vt100
> 
> s7 is just a unique tag name I picked basically out of the blue, I was going
>   to use s0 until I discovered another inittab line used it during startup.
> 
> default - is the name of an entry in /etc/gettytab, this is where
>   the serial port parameters such as baud rate is set.
> vt100 - termcap entry
> 
> 
> 
> This seems to work. For some reason I haven't yet figured out, the
> /dev/ttys0 device does not work, although all the documentation I've
> read said to use ttys0 for DOS com1 and ttys1 for DOS COM2. 
> Does anyone know why this is so?  I stumbled across the 
> /dev/cua0 device name when I was reading the setserial manual
> page.
> 
> 
> This brings me to another problem.  Although I can set the Linux
> port and Telix ports to the same speeds and everything works, there
> seems to be some sort of delay introduced which reduces the 
> effective transfer rate to under 9600 baud.  This happens regardless
> of the actual speed to which I set the serial ports. It is obvious that
> the ports are using the correct bit rates since  I only get the login prompts
> and a working connection if I match Telix and to the Linux serial port. But
> even at 38400 a screen refresh takes several seconds.  Has   Has  anyone 
> encountered this problem and fixed it?
> 
> Also, is there a way to set up Linux so that it uses the serial port as 
> its console during boot?  I'd like to be able to trap the boot up messages.
> 
> Thanks,
> 
> Rudy
> 
> 
> 
> 
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