I'm seeing people concerned it's going to be all old computers or steampunk, so here's some other interpretations. One: any old machine is technically old tech, even the printing press, abacas or weaving loom. Two: if your game is in the future, our current tech could be old tech.

Good luck! (And I personally am not against anyone doing old computers or steampunk. I think both would be games I'd enjoy playing, but can see how they might get boring if they were every other game.)