Tandy 1000SX. 1986. I got home from school, and Dad had set it up. He got us a subscription to 321 Contact magazine, so we could learn some programming on it.

I remember playing the space quest games, King's Quest 4, Lords of Conquest, Conquest of Camelot, Carmen Sandiego, and a lot of others. Eventually we got a 10 MB hard drive for it, but for years, we booted its dual 5.25" floppy setup with a DOS 3.2 floppy.