This article and video was just put up by IGN within the last day.
PlayStation NEO: How It Could Fail
"The TurboGrafx-16 (called the PC Engine in Japan) was a late-80s Japanese console that beat Sega and Nintendo’s 16-bit models to market. The console was designed to be expandable, with compatibility built into its tiny Core Grafx base that encouraged CD-ROM based expansions, upgraded video output, improved sound, several varieties of RAM expansions, and optional internal storage memory. The console was actually a big hit in Japan."
"But manufacturer NEC didn’t know when to quit. The company kept creating more and better hardware expansions for the platform, eventually producing a fragmented market.
The design culminated in the massive Japan-only SuperGrafx spin-off, which was a colossal failure.""Worse, NEC couldn’t duplicate its initial Japanese success when it came to the US. The expensive variety of hardware iterations fragmented the market and added extra cost at a time when the Genesis and SNES promised simpler solutions. While the TG-16 had some spectacular games, poor marketing, high prices, and a market fragmented by expansions and competitors doomed it."
http://www.ign.com/articles/2016/04/20/playstation-neo-how-it-could-fail