Re: ][c null modem problems...

["Paul Grammens" <grammens@svn.net>]

I have made several of these cables- IIc to Mac, IIc to PC.
What you need is essentially a IIc to Imagewriter I cable.  The Imagewriter
I used a DB-25 connector.  Your pinout matches mine, except I don't have a
connection to pin 5 of the IIc. I doubt if that is the problem, though.

There is a major pain, which you've discovered. Some of those connectors are
numbered one way, some another. There is also the confusion factor of
whether you are referring to the mating side or the solder side of the
connector.

Since it seems like it should work, I'd suggest reversing the order of
connections, and then if that fixes it, get back to us with a diagram that
includes whether you are referring to the external mating side of the
connector or the side that the wires are soldered to.
-Paul



"Dean Petters" <dpetters@grc.nasa.gov> wrote in message
3F27CB5E.3050806@grc.nasa.gov">news:3F27CB5E.3050806@grc.nasa.gov...
> as I am looking at the 5-pin male connector, the numbering I used is this:
>
> 1   5
>   2 4
>    3
>
> and the pinout on the db25 end is as follows
>
> 1=>20
> 2=>2
> 3=>7
> 4=>3
> 5=>6
>
> on the db25 end, the numbering is thus (as i look at the connector (not
> the back of the connector):
>
> 1 2 3   ....   12 13
>   14  15 ... 24  25
>
> all of this was my interpretation as to what is in the FAQ. in the FAQ
> they mention the 5..4..3..2..1 numbering (from left to right as you are
> looking at the connector) on the female plug on the back of the ][c, but
> that seems to convert to the numbering i've used on the male plug.
> should the numbering be 1..3..5..4..2?
>
> nothing happens in hyperterminal when i type on the ][c .  nada...
zilch...
>
>
>
>
>
> Peter Ibbotson wrote:
> > "Dean Petters" <dpetters@grc.nasa.gov> wrote in message
> > 3F27BAB0.80404@grc.nasa.gov">news:3F27BAB0.80404@grc.nasa.gov...
> >
> >>I am trying to move some old text files from an Apple ][c to a PC.  I've
> >>read over the FAQ and followed the directions on building a modem cable
> >>from an old 5-pin keyboard cable and a buck-50 DB25 female connector
> >>from Radio Shack (i bought the null modem adapter from RS also, since
> >>that's something i could potentially use elsewhere).  Checking the
> >>connections using a multimeter, it seems that all the wires are properly
> >>connected and that there are no shorts.
> >
> >
> >
> > What happens if you bash keys on the //c keyboard (hyperterminal should
show
> > those characters)
> > I suspect you problem here is the pin numbering! The apple version
doesn't
> > match that on the keyboard connector (Been there done that) I can't
remember
> > what the exact difference is I think one numbers clockwise the numbers
> > outwards from the middle pin i.e. (NOTE THIS DIAGRAM IS WRONG!!! THE
CORRECT
> > ONE IS ELSEWHERE)
> > 1   5  1   2
> >  2 4    3 4
> >   3      5
> >
> > It DOES work I boot strapped my //c using the same method. Just remember
to
> > add the delays to the hyper terminal end.
> >
>