When I got bored with that, I ported it to Windows and added sound support. Then I added graphical support for the OS/2 Presentation Manager.
At first is was a simple text-based simulation of the TI. Instead of doing the smart thing (looking for an existing emulator), I sat down and wrote my own. A few years back, I thought it would be neat to be able to play my old TI games on my PC. Well, here's my contribution to the TI-99/4A community.