I built David Tait programmer and it worked very well at the first time. Anyway i use a different software from David Tait's program (like that with programmer's scheme). This software have the same function of Tait's but is much more user frindly. I don't know how Tait's software work , but looking the programmer i think just well. In this moment i don't remember program name but you can find it in the same place where you find Tait' programmer . Francesco Lo Conte [s191448@studenti.ing.unipi.it]