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[John covici]

And this is why the Dectalk Express often is set to use xon-xoff -- at
least under windows.

on Friday 07/25/2008 Samuel Thibault(samuel.thibault at ens-lyon.org) wrote
 > Hello,
 > 
 > I guess it may have to go somewhere in the documentation.
 > 
 > Kerry Hoath, le Fri 25 Jul 2008 18:49:37 +0800, a écrit :
 > > I have no idea whether speakup supports the kernel scrollback buffer which 
 > > relys on storing text in spare video memory.
 > 
 > It doesn't currently, due to kernel interface limitations.
 > 
 > > Ok so what do you do from a Linux perspective? Block console output until 
 > > the synth raises rts?
 > 
 > That is what we are doing currently, by stopping the consoles (just like
 > if you pressed control-S or the scroll lock key).
 > 
 > > How long should that blokc happen for?
 > 
 > Until the synth has eaten some data
 > 
 > > What if rts never goes high again?
 > > Should the console freeze forever thereby introducing the possibility of a 
 > > denial of service attack or should speakup give up and assume synth not 
 > > present?
 > 
 > Speakup currently does the latter: after a few "full_time" timeouts,
 > speakup considers the synth to be dead, and thus restart the consoles.
 > 
 > > How long should this process take given that people run their synthesizers 
 > > at different speeds?
 > 
 > Interesting question, I guess full_time should take into account the
 > speed.
 > 
 > > Does the screen stop scrolling for a sighted person and does the console 
 > > file descriptor ever block for them?
 > 
 > Yes.
 > 
 > > I certainly would like to see the problem solved; however the problem is not 
 > > as simple as blocking console output when the synthesizer handshakes off.
 > 
 > It is not simple indeed, but it's implemented and does work to our
 > knowledge (William usually tests it with his ltlk for instance).  We
 > haven't yet figured out why it doesn't for the dectalk express.
 > 
 > > I also notice many cables for the dectalk distress either have bad wiring or 
 > > the firmware in the device doesn't even handshake reliably.
 > 
 > That would explain it.
 > 
 > Samuel
 > _______________________________________________
 > Speakup mailing list
 > Speakup at braille.uwo.ca
 > http://speech.braille.uwo.ca/mailman/listinfo/speakup

-- 
Your life is like a penny.  You're going to lose it.  The question is:
How do
you spend it?

         John Covici
         covici at ccs.covici.com