AVR-Chat

Hi

I have a trouble with a PIC microcontroller, I need to control some 
outputs, the PIC is in a project building by others and I can not 
modify, but I need put in the same circuit a One logic when the pic 
puts zero (only in some conditions), I want do that by atmega8 output, 
any ideas??

Other question is about cheap and good programmer for atmega8 that I 
can build compatible with AVR Studio 4.

Thanks for help.