Okay, here are some dos games I have that people can try:
Fallthru:
https://www.sendspace.com/pro/3c7hpd
One of the best text rpgs I have ever played, with awsome descriptions and a really epic feeling. Parser is super clunky, the learning curve is steep and some of the mazes boarder on the insane, but don't let that put you off.
Braminar:
https://www.sendspace.com/pro/3c7hpd
A really nice little rpg with lots of random encounters and strangeness. Repeating stats screen can be a tad annoying but it's worth a try all the same.
Drone:
https://www.sendspace.com/pro/ehsfu5
A game based on braminar with even more randomness, and some audio challenges, though only using the pc speaker I believe.
World of legends:
https://www.sendspace.com/pro/yc0q93
A console window rpg released in 2006. I'm not sure if this one needs dosbox or not but I know it won't work under post xp windows. Rather silly in parts, but very epic in others and with some interesting mechanics, albeit it is a little easy to cheat.
Castaway:
https://www.sendspace.com/pro/uicaa8
An old if style game, set on a desert island.
NEbula:
https://www.sendspace.com/pro/e2rcga
Another if style game, but set in space, also uses the pc speaker.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)