At 16.51 2005.08.26 -0700, you wrote:
>Hi,
>
>I built a JDM (http://www.jdm.homepage.dk/newpic.htm) programmer and am trying
>to make sense of what I'm seeing.  I'm using the icprog programming software
>under windows XP.  The serial line voltages are +/- 11.3V and all signals are
>present.
>
>Using icprog's hardware check and a multimeter, I'm checking the voltage levels
>of the part's pins.  The programmed part (in this case a 12CE673) is getting
>+5.1/gnd.  The rest of the lines are a lot more chaotic.  At times I seem to
>get reasonable voltage levels, though often only either positive or ground, but
>not both.  Other times, I seem to get voltages that don't seem to make sense.

That is probably because the programmer relies on the internal diodes of the
12CE673 to clamp PGD/PGC voltages.

But, wait, did you say "12CE673"? That chip sucks a lot of current.. you can't
program it with a standard JDM that takes the powah directly from the serial port..


>I've checked the various connections by ohming out my soldering.
>
>Has anyone else observed this kind of problem?  Is it possible that my serial
>port can't source enough power to run the programmer?  Any ideas on things to
>check?
>
>Thanks!
>Rudy
>
>
>		
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