Virtual Game Boy is the Nintendo GameBoy(tm) emulator on X-Window.

  Test your VGB installation with the command(default):

	vgb /usr/X11R6/share/vgb/CART.GB

Virtual GameBoy (VGB) is a portable emulator of the Nintendo GameBoy
handheld videogame console. It allows to run most of GameBoy software
on a personal computer, as well as debug this software. As VGB is
written in a portable C programming language, it runs on many
different platforms and operating systems

WWW: http://fms.komkon.org/VGB/