Camera 2D RPG in perspective

Hi,

I'm trying to make an old style rpg game in 2D. And I have problems with the camera. I know I can use the orthographic camera, but I want to use the perspective camera. The question is, is there any way to simulate the effect of an orthographic camera but still use the perspective camera?

Maybe using matrix cameras? I do not know what exactly is, but I read something looking information.

Any help is welcome.