[GreenKeys] End of line handling (was C-64)

[drlegendre .]

Relays..

A small current controls a second, larger current.. sounds familiar.

Can be configured as logic gates, including the NAND gate.. any logic gate
can be built up from NAND gates.. any logic block can be built up from the
available selection of logic gates.

Now how exactly is that "all relays = no electronics"? ;-)

It's just one of those things that bugs me, like when folks describe
anything built with vacuum tubes as "analog" - and conversely, anything
built from solid-state as "digital".

On Sat, Sep 5, 2015 at 2:21 AM, John Nagle <nagle at animats.com> wrote:

> On Fri, 4 Sep 2015, drlegendre . wrote:
>>
>> >You're right, I have never so much as put my hands on a mechanical
>>> >printer the likes of an M15 - I had no idea they lacked EOL sensing /
>>> >automatic CR. And since there's essentially zero flow control, the
>>> >printer can't toggle a control line (like DTR) to give the carriage time
>>> >to return and settle.?
>>>
>>
> Right. However, some Model 15 machines do have auto LF on CR and auto
> CR at end of line.  One of my Model 15 machines has both features;
> the other has neither.  That's an emergency measure; you will lose one
> character of info if the auto CR on end of line mechanism trips.
> With it, you never get a pileup at the right margin.
>
> My "baudotrss" program on SourceForge sends CR LF LTRS at the end
> of each line, and you can configure additional LTRS characters if
> desired.  However, CR LF should provide enough delay.  If it takes
> more than two character times to return the carriage and let the
> carriage return dashpot settle, the machine is out of spec.
>
> There's also an "unshift on space" feature.  Some machines shift
> to LTRS after every space.  "Baudotrss" understands carriage state
> as being LTRS, FIGS, or "unknown".  After a space in FIGS mode,
> it's treated as "unknown", so a LTRS  or FIGS will be put
> before the next printing character, whether needed or not.
>
> Baudotrss also has software right margin enforcement and word wrap,
> which is worth adding if you have a computer in the loop.
>
> Western Union built the first word wrap device in 1956 to drive a Model
> 15.  Here's the Western Union Technical Review article on it.
>
>
> http://massis.lcs.mit.edu/archives/technical/western-union-tech-review/10-1/p040.htm
>
> All relays; no electronics.
>
>                                 John Nagle
>
>
>
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