user7845: I am looking for the boards.txt, platform.txt and core files needed for the programming of the ATtiny13 with the Arduino Uno. Those I find on the internet probably only works with Arduino 1.0 and not with 1.6. 

user27: You can use the library for IDE 1.6 https://github.com/damellis/attiny/

7845: <p>I am looking for the boards.txt, platform.txt and core files needed for the programming of the ATtiny13 with the Arduino Uno. Those I find on the internet probably only works with Arduino 1.0 and not with 1.6. </p>
 27: <p>You can use the library for IDE 1.6 <a href="https://github.com/damellis/attiny/" rel="nofollow">https://github.com/damellis/attiny/</a></p>
