[GreenKeys] RTTY Keyboard Adapter - has anyone tried this?

Tue Apr 9 16:58:01 EDT 2013

Doug - looks  like a  useful thing to  have    to  test stuff  with.
we all have extra  ps2  keyboards... you  could  build  this into the 
keyboard case even!

Thanks I have  saved a PDF of it.

Ed Sharpe archivist  for SMECC   _www.smecc.org_ (http://www.smecc.org) 

In a message dated 4/9/2013 11:40:51 A.M. Mountain Standard Time,  
kolchak1 at yahoo.com writes:

I’m a relatively new Greenkeys member, and don’t know if this link  
appeared before, but it’s an interesting little circuit.

The  circuit is a ‘RTTY Keyboard Adapter’.  The circuit generates 5-volt,  
5-bit, 45 baud RTTY data, WITHOUT a computer.
All  you need to do, is connect a computer keyboard to it.  The circuit 
uses a  programmable PIC integrated circuit,
the  software is available for free download.  The circuit has a type-ahead 
 buffer, and automatic letters figures shift.

My  basic question is - has anyone already built and tried this circuit?

If  not, rather than everyone who is interested re-invent the wheel, maybe 
someone  who has a PIC programmer can program some chips,
and  sell them to interested people?  Just my thought.

Here  is the link to the circuit page.  The circuit is entitled “RTTY 
Keyboard  Adapter”, and appears about three quarters down the page.

http://www.g4jnt.com/pics.htm

Additional Notes:

I contacted the designer, and confirmed  the circuit generates 1 start bit, 
5 data bits, and a 1.5 stop bit.

The IC is readily available, Mouser  Electronics sells it in in both DIP 
and surface mount packages, all the suffix  variations should work.

PIC programmers are available on eBay from  US sellers for as little as $13.

If anyone has not seen my Teletypes in  Film and TV list, see my Flickr 
page below.

http://www.flickr.com/photos/14994379@N08/

Doug

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