Rolf wrote:
> For the record, I figured Olin's pedantic reply about his ICD2 not
> having an RJ12 plug was worth investigating, and it appears he is right.
>
> ICD2 s do NOT have RJ12 jacks. There apparently is no such thing
> specified. An RJ11 jack is a 6p2c modular plug, an RJ14 is 6p4c, and an
> RJ25 is 6p6c.

This is not what I was trying to point out.  I said I don't have a ICD2 with
a "ridiculous RJ12 jack" as the OP asked about.  Mine all have regular and
quite reasonable RJ12 jacks.

I didn't like the way the OP was asking for help and at the same time
putting words in anyone's mouth that might help him.  His question was a lot
like "Have you stopped beating your wife?".  Anyone responding to the OP's
question would be implicitly agreeing that the ICD2 connector is
"ridiculous" and that "everyone knows" that.  I thought that was arrogant
and a particularly obnoxious way to make a point, so I responded to his post
in a way that was litterally correct but otherwise useless.

If the OP thought a RJ-12 was the wrong choice for the ICD2 connector he
should have stated that as his opinion and provided some support for his
argument, instead of just calling it "ridiculous" and implying everyone
agrees with that.

For the record, I think RJ-12 was a reasonable choice.  It is quick to
connect and disconnect, locks with a positive feel, can't be plugged in
backwards, cheap, and widely available.  These connectors have proven to
work well in nearly 30 years of telephone use.

The one part of the design I don't like is the pinout.  PGC and PGD are next
to each other.  This invites crosstalk, and I've presonally seen it happen.
At the time of the design, Microchip was vaguely planning the last pin for
PGM, but that was never implemented.  In hindsight it would have been much
better to separate PGC and PGD with a extra ground wire.  All my programmers
have a RJ-12 jack for compatibility, but also a 6 pin header and/or pads
with the extra ground line between PGC and PGD.  For programmers built into
fixtures, I always recommend the 6 pin interface be used instead of the
RJ-12, but not because there is anything wrong with a RJ-12 jack.


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