wdonzelli at gmail.com
Sat Aug 14 19:14:00 CDT 2010
> Almost all companies got the gender wrong on their equipment.
For "almost all companies" to get the gender wrong, somehow we
managed. Mostly, it was just making or ordering cable Y instead of
> And to make matters ridiculously worse, we have IBM. Who simply put just
> raped the RS-232 standard by using a DE9, moving one or two pins in a
> totally non-logical way, changing the gender, *and* sortof wiring it as a
DG also used non standard DEs I think. Moving serial to the DE was in
the cards, simply because the DB was underutilized and took up too
much real estate.
IBM certainly played the standard violation game as well, but somehow
the DE9 serial issue is no big deal. Order or make cable Z, and the
problem is solved.
> What DEC did with MMJ was in no way violating any standard.
> right mind would think that an MMJ was an RS-232. So what standard did they
> violate (if I may ask?).
A new connector that requires new tooling. Every halfway decently
sized DP shop probably had a nice selection of tools and supplies for
D shell and RJ connectors. Male or female - no problem to make
whatever. Or call up the cable supplier or Inmac, and let do the work.
But not with MMJ, everyone has to get that special die...
> Ethernet vs. RS-232 on a RJ45? Give me a break. None of that even existed
> when the MMJ came about.
OK, yes, I suppose it is a bit early, so I will take that back (but,
come on, lighten up a bit. Did I touch a nerve?). I was told that
DEC's reason is that too many people were confusing things that use RJ
connectors. However, it was pretty clear at the time that RJs were
going to be a hit. Serial went there, and even token ring.
> I don't know. When was the end of the monochrome CRT era? Has it ended yet?
Yes, it has ended. Monochome CRTs have not been made for quite a few
years now. "New" production terminals are using refurbished tubes.
Also, I bet the number of new dumb terminals being ordered these days
is tiny, and it would not surprise me if what is being sold today as
new is just old stock from the warehouses. I is a whole lot cheaper to
store a few thousand terminals in a warehouse than it is to keep a
very slow production line open, with the bonus that unsold stock can
be written off and scrapped.
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