--- Denny Esterline <firmware@TDS.NET> wrote:
> I'm guessing that since you've mentioned negative
> voltages, your either not
> familiar with the way the JDM design works, or
> you've connected it to the
> wrong pins on your serial port.

Well, it's true that I'm not familiar with how the JDM
works, but since I'm using a standard SUBD connector &
cable plugged straight into my PC I see no way how
pins could have been switched.

> If you use pic pin #31 (Vss) as the "ground", none
> of the programming
> connections should ever be below 0v (if they are,
> you're killing the pic)

I measured everything against pin #12 which is also
Vss (connected directly to pin #31). I might have
measured against the wrong pin once, but I'm sure I
haven't been measuring for 30mins with a wrong ground
pin.

> Take a look over at
> http://www.olimex.com/dev/pic-pg2c.html It's a
> commercial JDM programmer a lot like you've
> designed. Schematics and
> documentation is available at the above link. When I
> found out I could buy
> one for ~$12 us (including shipping) I couldn't
> justify building my own.

Building my own costs me ~5  + the cost of the PCB,
which is 3  for 15x12cm (I think) + the cost of some
chemicals which can be used for lots of boards. In the
end I think it costs me ~5.5-6  for one programmer. I
don't consider buying one an option.

> But take a look at the schematics and see if you can
> find the problem.

I've just rechecked the schematic and I really can't
see anything wrong. I probably missed something, but I
just don't see it.

> And I'm assuming that since you can manipulate the
> voltage levels, you've
> overcome the limitations of XP?.

Yes, how to fix this is mentioned on the UCapps page
(I think I found it there, could be somewhere else
though).

Regards, Anthony *still looking for some kind of error*

=====
Website: http://members.lycos.nl/anthonyvh


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