system developed by SNK
. Superceded the (somewhat pointless) Neogeo Pocket
monochrome model released in 1998
. It is not compatible with or based on the home and arcade NeoGeo
platforms (although SNK did port most of their big arcade titles to the machine).
The NGPC competed directly with the Game Boy Color, and by all accounts blew Nintendo's machine out of the water in terms of power. SNK withdrew the machine from Europe and the US even though it was turning a profit - they had predicted that their market share would never grow large enough to make the machine viable, especially in the light of the Pokémon phenomenon and the prospect of stiffer competition from the Game Boy Advance. (There was also the issue of alleged mismanagement of SNK's North American operations which did little to help the machine.)
There are two notable things about the NGPC that distinguish it from other handheld systems.
The first was the (award-winning) hardware design. The machine could run for 40 hours off of 2 AA batteries, thanks to the non-backlit TFT reflective screen. Unlike the original model GBA, the dot pitch and contrast of this screen allow it to be used comfortably in normal lighting conditions. Instead of a d-pad there is a small microswitched thumb-stick, which is much more accurate and comfortable to use, especially for fighting games. The system had a built-in clock and calendar, and practically every game released for the system allowed battery-backed saving, powered by a lithium watch battery in the machine itself.
The game cartridges (which could be up to 32 megabits in capacity) used 'flashable' ROM chips, allowing SNK to recall remaindered games and rewrite the carts with different game titles. There was a wireless RF-link peripheral available in Japan, which allowed for up to 8 players to compete in supported games (e.g. Faselei!).
The other notable thing about the system was that although there were hardly any third-party games released for it (outside of Japan at least), the library of 200 or so games for the system had an extremely high concentration of quality. (The same cannot be said, so far, of the Game Boy Advance although this will undoubtedly change.)
There are several games for the NGPC that are quite simply the best in their genre on any handheld system. SNK vs. Capcom: The Match of the Millennium is probably the high watermark, but there are several other games worthy of attention (such as Faselei! , Card Fighters Clash, Sonic Pocket Adventure, The Last Blade, King of Fighters, Rockman Battle and Fighters and Turf Masters). There are a large number of fighting games on the system, but most other (technically feasible) genres are represented in some fashion as well (with the exception of racing games).
Since SNK closed, the NeoGeo Pocket Color and its software have not been sold in stores, but occasional caches of stock turn up on mail order sites and there is a steady trickle of (overpriced?) NGPC goods on eBay.
Every ROM for the system: http://get.to/ngpc (N.B.: Software piracy is a crime.)
Stuff for developers: http://www.devrs.com/ngp/