[GreenKeys] Avarda ITTY Feed / StayShift-On-Space

[Paul Heller]

Hi John,

First, I think all is working with no known problems. 

Your scheme is pretty much how ITTY works as well.  I think the fourth line is a typo:

> figure      LTRS        LTRS        LTRS

Should be 
figure      LTRS        FIGS        FIGS

The only problem is extra LTRS codes vs hardware unshift on space, making tapes longer.

Paul
W2TTY
ITTY:   HTTP://ITTY.INTERNET-TTY.NET:8000/ITTY
AUTOSTART: HTTP://ITTY.INTERNET-TTY.NET:8030/AUTOSTART

> On Oct 26, 2017, at 10:05 PM, John Nagle <nagle at animats.com> wrote:
> 
>   If this is a problem, I'd suggest making the sending software indifferent to unshift-on-space.  My "baudotrss" does this. The
> logic is
> 
> 
> 
>    Next char   Prev state  New state   Send    Notes
> 
>    letter      LTRS        LTRS
>    letter      FIGS        LTRS        LTRS
>    letter      UNKNOWN     LTRS        LTRS       State UNKNOWN, shift
> 
>    figure      LTRS        LTRS        LTRS
>    figure      FIGS        FIGS
>    figure      UNKNOWN     FIGS        FIGS    State UNKNOWN, shift
> 
>    space       LTRS        LTRS
>    space       FIGS        UNKNOWN             Don't know state now
>    space       UNKNOWN     UNKNOWN
> 
>    LTRS        any         LTRS
>    FIGS        any         FIGS
>    LF, CR      any         no change
>    BLANK       any         no change
> 
> 
> 
> The key here is the UNKNOWN state.  When in UNKNOWN state, and
> LTRS or FIGS state is needed, LTRS or FIGS must be sent.
> When a SPACE is seen in FIGS state, the state becomes UNKNOWN,
> because we don't know the state of the received machines.
> 
> The effect is that every space followed by a figure has
> a FIGS inserted. Then it doesn't matter whether the receiving machine
> has unshift-on-space.
> 
>                John Nagle
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
> 
> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20171027/bc606e14/attachment.html>