[ale] lurkers beware - thar be dragons and ancient IT nightmares here; OT - was - Connecting to r-pi

[Jim Kinney]

That should do it :-)

On Fri, 2018-10-26 at 16:39 -0400, DJ-Pfulio via Ale wrote:
> Any chance that someone would change the subject, so lurkers seeking
> help withtheir raspberry pis don't get confused?
> 
> On 10/26/18 11:56 AM, Scott Plante via Ale wrote:
> Actually, lack of good flow control was what inspired me to really
> learn vireally well. I used to program all the time on a dumb
> terminal connected to aUnix box, and if you just held down an arrow
> key to get midway across thescreen, the whole session would become
> jumbled and you'd have to refresh. So Ilearned all the obscure vi
> keys to move around the screen and file instead ofarrow/page keys.
> Once internalized, it made me much more efficient even after Ihad a
> reliable terminal connection or full desktop.
> Scott
> -------------------------------------------------------------------
> -------------*From: *"Jim Kinney" <jim.kinney at gmail.com>*To: *"Chris
> Fowler" <cfowler at outpostsentinel.com>, "Atlanta Linux Enthusiasts"<
> ale at ale.org>, "Chris Fowler via Ale" <ale at ale.org>, "Scott Plante"<
> splante at insightsys.com>*Sent: *Thursday, October 25, 2018 8:12:39
> PM*Subject: *Re: [ale] Connecting to r-pi
> Alcohol cures all flow control memories. I have no idea what you just
> said :-)
> Had to calculate and test timings in early grad school. Signal
> propogation timein wire plus time in detection circuits plus time to
> trigger action on detectionplus actual signal length, etc. Now add in
> the blasted data collection systemwas getting data from multiple
> sources with different timings, yeah. Fun stuff.
> On October 25, 2018 6:26:55 PM EDT, Chris Fowler via Ale <ale at ale.org
> > wrote:
> 
> 
>     -----------------------------------------------------------------
> ---------------
>         *From: *"Scott Plante via Ale" <ale at ale.org>        *To:
> *"Alex Carver" <agcarver+ale at acarver.net>, "Atlanta
> Linux        Enthusiasts" <ale at ale.org>        *Sent: *Wednesday,
> October 24, 2018 4:03:34 PM        *Subject: *Re: [ale] Connecting to
> r-pi
>         If you're inclined to believe Wikipedia, the early teletypes
> would        actually perform a carriage return to the left and line
> feed the paper        up one row on a LF, but the CR was necessary
> because of timing--it took        longer than the gap between
> characters to physically return the print        head so they added
> the CR to allow enough time. Apparently they        sometimes had to
> add NULs as well. Even some CRT terminals took too long        to
> scroll all the text up. Apparently they didn't have flow control
> back        then.
>     Very small buffers.  Very small.  I had a similar problem
> automating Nortel    Merdian PBX over its console.  I wrapped up the
> expect send into a function    that put a pause between each
> character.  I basically automated the PBX and    had to also simulate
> a person typing in the commands.   If not, the PBX    missed
> characters I had sent.  If a T1/PRI failed the program would try
> to    bring up and check.  If it was still in alarm it would report
> the alarm and    create the ticket. 
> 
>         I used to have a TRS-80 and a "Gorilla Banana" printer. I
> could never        get the flow control to work with it, and had to
> write a program to        print stuff. It would manually pause a
> fraction of a second after each        line before sending the next
> one to the port. Those were the days! ha ha
>     I was hoping I would never hear about flow control and serial
> printers ever    again.  And here you are...
>     XON/XOFF flow control is software and does have a tendancy to not
> work well    with small buffer serial printers.
>     Hardware could be either DTS/DSR or CTS/RTS flow on the
> printer.   Using    that would have made it work better.  The problem
> is that you need to know    what flow the printer supports or you
> need to set the DIP switches to the    flow you want.
>     My Okidata days are 20 years behind me. :)
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-- 
James P. Kinney III

Every time you stop a school, you will have to build a jail. What you
gain at one end you lose at the other. It's like feeding a dog on his
own tail. It won't fatten the dog.
- Speech 11/23/1900 Mark Twain

http://heretothereideas.blogspot.com/

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