I had a Master System 2. I remember my dad buying one for me from WH Smith. My first ever console and first ever "computer". I felt like a total boss walking home with it. Very happy memories of that console! My mother was the first person I knew who completed Power Strike in one sitting (you had to, no saves!) and with only the lowest type of weapon (1, but fully pimped). Amazing.. I got home from school once and there she was - she'd been sitting there playing it since the morning, non stop and completed it just as I walked in.
Then there's Kenseiden, Alex Kid (the original!! In Miracle World), R-Type... oh man...