these are integrated circuits used with the various biversion mods (doubly-inverted LCD palette). the biversion technique is done through a double inversion: 1) via rotating the polarization film of a backlight 90 degrees, and 2) using a hex inverting IC to invert the palette of the LCD itself. the result is a more crisp contrast on the LCD screen.
this mod is applicable to the DMG (original) and MGB (pocket) Game Boy consoles.
includes IC only.