>>>>> "Chris" == Chris Muller <chris.muller_at_mullermedia.com> writes:
Chris> Paul, Thanks for your insights. I found some useful background
Chris> info here:
Chris>
http://keemiarelva.tehas.ee/asjad/telecomi%20plaat/Kompuuterelektroonika/
Chris> These docs are in English, written (or at least compiled) in
Chris> the early 80's. I'd be curious if anyone knows the original
Chris> source for them. In any case, see the top of page 9-11 in the
Chris> file 14091_ch9.pdf.
Thank goodness they aren't in Estonian, as the website itself
is... :-)
Google found another copy of that for me:
http://www.tpub.com/content/fc/index.htm which says it is a "fire
controlman" training manual".
(FWIW, I told Google to find "RD-358(V)/UYK" which shows up on that
page you mentioned. Some of the other hits talk about Trident -- a
nuclear missile submarine.)
Chris> It says "In addition to lateral parity, many units also use a
Chris> longitudinal parity check." That seems to imply that some
Chris> didn't.
I wonder if it was simply the author hedging his bets, since he
couldn't say authoritatively that they all did. But it may be that
indeed it was not always done. Given that it showed up back in 1955,
and in all the CDC docs I checked, I would claim that, even if not
universal, longitudinal parity was certainly the norm.
paul
Received on Thu Sep 30 2004 - 09:44:40 BST