[GreenKeys] Model 19 on ITTY

Fri Jan 24 13:51:17 EST 2020

"Real computers have serial ports"

Duncan
K2OEQ

On 1/24/2020 13:39, Paul Heller wrote:
> I have found that some of those “dongles” work better than others. 
> Ones with the prolific PL2303 chipset work better.  But in the past 
> few years I’ve found that many of the Chinese dongles say they have 
> the prolific PL2303 chipset but either don’t or have a counterfeit 
> chipset that does not work.
>
> Things used to work but then stopped. Two issues, low speed (45 baud) 
> and 5 bit, make it a jump ball as to whether a given usb/rs232 adapter 
> will work
>
> This drove me crazy so I ended up using computers with real RS-232 
> serial ports.
>
> Paul
> W2TTY
>
> ITTY: HTTP://INTERNET-TTY.NET:8000/ITTY 
> <http://internet-tty.net:8000/ITTY>
> ITTY100: HTTP://INTERNET-TTY.NET:8010/ITTY100 
> <http://internet-tty.net:8040/EUROPE>
> AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART 
> <http://internet-tty.net:8030/AUTOSTART>
> EUROPE: HTTP://INTERNET-TTY.NET:8040/EUROPE 
> <http://internet-tty.net:8040/EUROPE>
>
>> On Jan 24, 2020, at 10:31 AM, Al Klase <ark at ar88.net> wrote:
>>
>>  Virgil,
>>
>> Thanks for your input.  In my experience, these USB to serial dongles 
>> do not support 5-bit data.  I think the USARTS, in the early PC cards 
>> were based on the old Zilog design that could be set in almost any 
>> way by the drivers.  Software like Heavy Metal would work just fine 
>> on these dionsaurs, but not the new dongles.
>>
>> Al
>>
>> On 1/24/2020 10:40 AM, Virgil Bierschwale wrote:
>>> you can always add a rs232 board to the computer or use something 
>>> like this
>>>
>>> https://www.amazon.com/RS-232-Serial-Adapter-Windows-64bit/dp/B004WL7MIQ 
>>>
>>>
>>>
>>> On Fri, Jan 24, 2020 at 9:38 AM Duncan Brown 
>>> <duncanancy at earthlink.net <mailto:duncanancy at earthlink.net>> wrote:
>>>
>>>     AL,
>>>
>>>     Are XR-2211 chips still available?  They make a very simple AFSK
>>>     decoder. It is a 14 pin DIP IC and with a few Rs & Cs will give
>>>     you an
>>>     AFSK decoder. (you don't need any limiter or selectivity coming off
>>>     ITTY) Then just add an optocoupler to interface with the TTY loop.
>>>
>>>     If you you manage to get MMTTY to  output to a serial port,
>>>     don't worry
>>>     about ASCII  conversion. MMTTY will output in 5-bit.
>>>
>>>     For a serial port, look for an old Win 7 or XP laptop.
>>>
>>>     Good luck,
>>>
>>>     Duncan
>>>     K2OEQ
>>>
>>>
>>>     On 1/24/2020 09:56, Al Klase wrote:
>>>     > Hi Ralph, /et al/
>>>     >
>>>     > The point is we don't have a TU.  We'll be running a PC anyway
>>>     if we
>>>     > monitor ITTY.  Logic level to current loop isn't a problem,
>>>     and I've
>>>     > found an Arduino "sketch" that will go from ASCII to baudot.
>>>     >
>>>     > I'm exploring RTTYT which looks like it will handle the PC
>>>     chore.  The
>>>     > scheme is complicated by the fact that modern PC's don't have
>>>     RS-232
>>>     > ports, and the UART's in the USB dongles don't support 5-bit
>>>     formats.
>>>     >
>>>     > 73,
>>>     > Al
>>>     >
>>>     > On 1/23/2020 5:00 PM, Ralph Mowery wrote:
>>>     >>
>>>     >> Doesn’t the audio come out of your computer speakers ?   If
>>>     so you
>>>     >> could just run that audio into any modem/TU and then to the
>>>     machine.
>>>     >> I think that is what I did a year or so back.
>>>     >>
>>>     >> Ralph ku4pt
>>>     >>
>>>     >> *From:*greenkeys-bounces at mailman.qth.net
>>>     <mailto:greenkeys-bounces at mailman.qth.net>
>>>     >> [mailto:greenkeys-bounces at mailman.qth.net
>>>     <mailto:greenkeys-bounces at mailman.qth.net>] *On Behalf Of *Al Klase
>>>     >> *Sent:* Thursday, January 23, 2020 4:40 PM
>>>     >> *To:* greenkeys at mailman.qth.net
>>>     <mailto:greenkeys at mailman.qth.net>
>>>     >> *Subject:* [GreenKeys] Model 19 on ITTY
>>>     >>
>>>     >> Gang,
>>>     >>
>>>     >> We're still klutzing around with TTY's at the Radio Technology
>>>     >> Museum, and we're starting to make some progress.  So, how do
>>>     we get
>>>     >> data from ITTY out to the machine?
>>>     >>
>>>     >> I have MMTTY copying the stream FB, but don't see the hooks
>>>     to get
>>>     >> the data out.  Even 8-bit ASCII on a COM Port would be OK, as
>>>     we can
>>>     >> use TinyFSK on an Arduino to get to Baudot.
>>>     >>
>>>     >> I may just be dense. :-(
>>>     >>
>>>     >> Al
>>>     >>
>>>     >
>>>     > --
>>>     > Al Klase – N3FRQ
>>>     > Jersey City, NJ
>>>     > http://www.skywaves.ar88.net/
>>>
>
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