Before I joined the computer security industry in the early 1990s, I used to write computer games. Here you can find out about some of them:
Jacaranda Jim - DOS text adventure game. (Either play it online, or download)
Humbug - a better DOS text adventure game. (Either play it online, or download)
Blox - a shameless Tetris rip-off with a nice Boss key.
Wibbling Wilf - a "bad trip" spin on Pacman, involving leaky jam sandwiches and harmonicas.