[GreenKeys] RCA teleprinter ad on EBAY 381052171359 trans-atlantic

[Lester Veenstra]

The details and history are here, as usual:

http://en.wikipedia.org/wiki/ARQ-M


Lester B Veenstra  MØYCM K1YCM W8YCM
lester at veenstras.com

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-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of
Jones, Douglas W
Sent: Friday, November 14, 2014 9:20 AM
To: GreenKeys via GreenKeys
Subject: Re: [GreenKeys] RCA teleprinter ad on EBAY 381052171359
trans-atlantic


On Nov 14, 2014, at 7:53 AM, Ed Sharpe Archivist for SMECC via GreenKeys
wrote:

> RCA  teleprinter  ad  on EBAY 381052171359 Trans-Atlantic radio teletype
with  error correcting TEX unit... more  info on this ?  if anyone buys this
scan  it   for all of us!

I did a google search on fragments of the text and it came up with
this:
-- http://books.google.com/books?id=mdgDAAAAMBAJ&pg=PA239

That is, Popular Mechanics, September 1950, page 239.

Sounds like parity for error detection with some kind of
ENQ-ACK flow control with NAK used to request retransmission?
Hard to tell from this kind of ad, but definitely some kind
of error correction protocol.

The resolution of Google's scan of the ad is about twice
than the resolution of the scan quoted from E-bay.

		Doug Jones
		jones at cs.uiowa.edu
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