[ale] video over serial

[Mike Panetta]

Now now now...  Its not quite that bad... The X protocol "compresses"
the data I believe, after the first screen it only sends the
differences.  I have actually done X over a dialup before (a long time
ago, just to play around) and it did work, but I recall the first screen
refresh taking several minutes before it displayed (this was to display
a netscape window).  After that it was not to bad, just so long as you
did not do any major moving of the window or whatever.

Besides, X will not send the entire screen (unless you do an entire
session over the link, that would be insane though) it only sends the
data contained in the window you are viewing.

Mike

On Sun, 2003-01-12 at 19:30, James P. Kinney III wrote:
> That would be much worse than "extremely painful".
> 
> 640x480x8 bit color = 2,457,600 bit per screen.
> 
> Serial line speed 115200 bits per second. (doesn't look good from here)
> 
> screen size / speed = 21 seconds PER SCREEN WRITE!!!
> 
> Hopefully, this is just for a little 2 line LCD display for fan temp.
> 
> On Sun, 2003-01-12 at 20:54, Mike Panetta wrote:
> > I think he wants a graphical display...  Thats my assumption atleast...
> > 
> > Thats not very easy over serial...  I wont say its impossible, but X
> > over serial wont be very fast....
> > 
> > 
> > Mike
> > 
> > On Sat, 2003-01-11 at 06:09, Geoffrey wrote:
> > > Maybe I'm missing something.  Sounds like your typical serial 
> > > connection.  This is the way UNIX used to be.  One computer with a bunch 
> > > of dumb terminals connected to it via serial.  You can have a direct 
> > > serial connection between the two computers, turn a getty on on that 
> > > port and you've got login, it's that easy.
> > > 
> > > So, maybe it's too early (on Saturday), someone else tell me what I'm 
> > > missing??
> > > 
> > > Joe wrote:
> > > >>hey i dont know what it would be called (if it even exists) so im asking
> > > >>here :) i was curious, say we had the right cable to hook a computers
> > > >>video out (like inverted serial) to a serial port, could it be displayed
> > > >>on a laptop with the right app? is there such an app? it would make my
> > > >>life sooooooo easy if i could plug a laptop into a computer and have an
> > > >>instant screen :).. well almost instant, and yet portable! reason i ask i
> > > >>have an old p1 laptop thats collecting dust, i want to use it for a series
> > > >>of thin clients, stuff like ssh connections to other computers, as a
> > > >>moniter, that sorta thing... is it possible ? all it would be doing is
> > > >>taking data in from serial and displaying it in a window in linux, atleast
> > > >>it sounds simple... my guess is for some reason its not possible,... could
> > > >>someone shed some light on this?
> > > > 
> > > > 
> > > > You could install VNC <URL: http://www.uk.research.att.com/vnc> on both
> > > > machines and use SLIP or PPP to set up an IP network via the serial
> > > > ports. It might be a bit slow, though.
> > > > 
> > > > If all you need is a text shell (eg telnet), then PPP-over-RS232
> > > > would be a fine solution.
> > > > 
> > > > Adapting a video output to a serial port is not possible (or
> > > > not sensible, anyway) - the video output is nothing like
> > > > ASCII text.
> > > > 
> > > > Cheers,
> > > > 
> > > > -- Joe
> > > >  
> > > > _______________________________________________
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> > > > Ale at ale.org
> > > > http://www.ale.org/mailman/listinfo/ale
> > > > 
> > > > 
> > > 
> > > -- 
> > > Until later: Geoffrey		esoteric at 3times25.net
> > > 
> > > The latest, most widespread virus?  Microsoft end user agreement.
> > > Think about it...
> > > 
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> > 
> > 
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> -- 
> James P. Kinney III   \Changing the mobile computing world/
> President and CEO      \          one Linux user         /
> Local Net Solutions,LLC \           at a time.          /
> 770-493-8244             \.___________________________./
> 
> GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics) <jkinney at localnetsolutions.com>
> Fingerprint = 3C9E 6366 54FC A3FE BA4D 0659 6190 ADC3 829C 6CA7 
> 
> 


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