Approximetly at the time when Atari presented the Lynx portable game system, NEC introduced the portable version of their popular (in Japan at least!) PC-Engine console.
Named the "PC-Engine GT" (As "Game and Tv" but renamed "Turbo Express" for the US market); the device was blessed with the huge game library available for the PC-Engine system; and was extremely well designed.
As it's name suggests, a TV Tuner extension was available in Japan to transform the little PC-Engine GT into a portable television.
The built-in package includes the classic NEC controls (Select, Start, directionnal round paddle, and 2 action buttons) with the luxury of 2 autofire setting buttons, one for each action button, and an wonderful little backlit color screen. That screen was the best screen ever seen on a color portable console until the GameBoy Advance LT came out!

Unlike other 8 bits system, which used huge brick-like cartridges; the NEC console used a very compact, credit-card sized cartridge format ; the Hu-Cards.
Originally developped by Hudson as the Bee-Cards, this card format was also used by the Atari Portofolio for it's extension cards.
These very small were perfectly suitable for the nomad use of the PC-Engine LT

As a highly innovative game system, the PC-Engine was the first console to offer CD-Rom support!
The original (and tiny) PC-Engine console could be connected to an "interface unit" allowing connecting the the dedicated CD-Rom player. The system i own (pictured above) is a PC-Engine DUO-R; it's a later version, gathering everything in one smart system. It has thus both a CD-player and a card slot for classic cartridge games.
It's fun to know that the PC-Engine CD-Roms are actually audio CDs! Put one in a HiFi CD player and, after a japanese warning on track one (the beginning says "Kore wa, H-E sisutemu-no CD-romu disuku desu" meaning "This a HE-System CD-Rom Disk", easy, huh?); you'll hear "kompyuta no data" (computer data) just like in the good old audio-tape recorded programs!