Originally I thought it was a text printed on the screen, but looking at the art assets in Rise of the Triad, the "buy a 486! :)" actually part of the backgroun

Originally I thought it was a text printed on the screen, but looking at the art assets in Rise of the Triad, the "buy a 486! :)" actually part of the background graphic. It's just normally hidden by the play area unless you use the smallest size.