McWill Game Gear "Full Mod"
Nearly every handheld console released between the original Game Boy and the DS has some kind of screen mod available to replace its original LCD technology with a "modern", backlit, high speed LCD. This is mostly because early LCD technology had a lot of shortcomings, from washed out colors, to slow, low contrast LCD cells, to complicated high-voltage fluorescent backlights that severely limited viewing angles. The oldest such modern screen for an old handheld I can recall is the "McWill" LCD mod for the Atari Lynx. The Lynx "McWill" mod was nigh legendary because it was such a perfect match. The new screen was bright, responsive, exactly (or nearly exactly) the same dimensions, and used perfect integer scaling. It took the Lynx from a blurry washed out screen to a sharp and crystal clear display. Of course the first thing many people wondered after seeing it, was what options might exist for other, more popular handhelds such as the Sega Game Gear. Aft