Thought I had;
Doom 1, Castle Wolfenstien Commander Keen etc on floppies
Red Baron [256 colour on floppies]
DOS 6 [on floppies, the rare 6.0 with Double Space]
But just checked, none of them contain any useable data after nearly 30 years.
The first computer program I wrote was recorded onto cassette tape, but they are long gone.
I do still have a RAM expander, a card that fits into a single RAM slot but has space for 4 RAM chips (ie turn 1 slot into 4).
It still has the 4 (at the time) MASSIVE 256Kb RAM chips in it!