I'm so amused at the thought of N64 being old-school! I've been playing video games since before most of you were born (*shakes walking stick*), and to me, old-school is
pre-1990.
That being said, my favourite old-school game, originally released for
BBC B, is now available to download for the PC:
Imogen. It's a puzzle & platform game.
Imogen on Wikipedia. I highly recommend it.
I had a
BBC Master 128. It was hardcore! 128 kB, more than any other computer at the time. And an expansion slot which would bring it up to 256 kB! Later, I had an
Acorn Archimedes 440/1 - okay, the price at retail may have been £1299 but that's ex-VAT, and by the time you added on the cost of a monitor etc it was well over £2000. Hilariously, the computing power of this machine is more-or-less identical to my £129 GameBoy Advance SP - and may be directly compared, as they both use ARM chips.
I played all of these games back in the 80s. See also
Frak!, which had
the best graphics around at the time. I should note that I was rubbish at it due to a total lack of hand-eye coordination.
The first game I ever played in primary school, circa 1985.