[GreenKeys] Model 19 on ITTY

[Paul Heller]

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
ITTY100:		HTTP://INTERNET-TTY.NET:8010/ITTY100
AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART
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> 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] *On Behalf Of *Al Klase
>>> >> *Sent:* Thursday, January 23, 2020 4:40 PM
>>> >> *To:* 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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