Well, it was a long time ago, so I'm not entirely sure... but it must have been either the ColecoVision or my older brother's VIC-20. I don't remember when we got either of them, since I was probably only 1 or 2 years old at the time.

The VIC-20 eventually became mine after my brother got a C-64 (And his C64 eventually became mine after my brother got an Amiga).

Other than the VIC-20, the first game system I got that was really mine was a Gameboy, on what was probably the first Christmas that it was available (1989?). We never had a NES, so my parents finally gave in and bought me this and Super Mario Land. I was extremely happy, and I still have the Gameboy in question, still working perfectly fine (although the screen is kinda scratched up by now, and I somehow lost my Tetris cartridge ).

--Zero