This is a 3D graphics demo I wrote in high school (circa 1997).
The main program is in src/3D6.PAS.
The vbox directory contains a VirtualBox VM that can be used to run the program. Type "3D6" to start. The program will print some memory information; press the enter key to continue. Use the numeric keypad or arrow keys to move around. Press "7" to look up and "1" to look down. Press "esc" to exit.