Ars Technica is running a series on the history of the Amiga.  This is the machine I grew up with.  It was way ahead of its time for graphics and sound.  It took many years for the PC (and even Mac) worlds to catch up.  Unfortunately, it was marketed by a less than competent company.  The Amiga eventually died when Commodore went bankrupt but it had a great run.  The article has two parts so far.  I'll try to update this post when more are posted.

Part 1 - Genesis

Part 2 - The birth of the Amiga

Part 3 - The first prototype

Part 4