Hi,
I am currently using DS87C520's and an Iguanna Labs programmer. The eraser I am using has 7, 15, and 30 minute settings. I am having problems with the controllers in that after a few cycles they quit working (i.e. the programmer says they are programmed but they don't do anything in the circuit). However, if I put a new chip in the programmer and then try it in the circuit it works fine. Any ideas?