Hexadecimal machine code

Hexadecimal machine code was the language used in poetry by Servo, a maintenance droid in the Haven. The Eighth Doctor understood hexadecimal, and had no trouble translating Servo's poem:
 * #42 #36
 * #CB #2
 * #88 #3-FD
 * #0 #2

Which translated to:
 * I look out at the stars,
 * And I feel my life is insignificant;
 * But then I look again,
 * And I feel glad to be alive (AUDIO: The Cannibalists)