Eagle Files by me, ian.

Layout taken from here: http://www.belza.cz/digital/jdm.htm

JDM2 was born somewhere around here: http://www.jdm.homepage.dk/newpic.htm

So I don't claim or support this work.  You might need to
look at the image to see some part values.  The
image also shows ICSP header pin order.

THIS WILL NOT WORK WITH USB->SERIAL ADAPTER.  DON'T EVEN 
THINK ABOUT IT.  Google around if you don't believe me. 

THERE IS A VERY REAL POSSIBILITY THIS MAY NOT WORK WITH YOUR
LAPTOP'S SERIAL PORT. The voltage levels are not high enough.