Home of the original IBM PC emulator for browsers.
From MobyGames:
This game is like a cross between a Kroz game and a text adventure – the player moves through a castle using the arrow keys, picking up equipment and battling monsters in real-time along the way; however, at any time, it is also possible to type simple commands into the game’s text parser, allowing a greater variety of actions and more complex solutions to problems. The object of the game is to escape from the 83-room castle while collecting as many of the thirteen available treasures as possible.
[PCjs Machine "ibm5160-castle-adventure"]
Waiting for machine "ibm5160-castle-adventure" to load....
Volume in drive A is CASTLE
Directory of A:\
CASTLE EXE 70656 6-01-85 7:48p
CASTLE RAN 48384 6-01-85 7:48p
2 file(s) 119040 bytes
40960 bytes free