10 PRINT "Happy Birthday Spectrum"
20 GOTO 10
30 years ago my first ever computer was launched. It was the first time I played computer games at home (Manic Miner, The Hobbit and Atic Atac were my favourites), and it even encouraged me to start programming. It had 48kb of memory and 8 colours (that caused colour clash if they shared 8-pixel spaces). I still look back on it with very fond memories.
There's a great retrospective on the BBC here.