Super CD-ROM²) as well as new "LD-ROM²" titles that work only on this device. NEC also released their own LaserActive unit (NEC PCE-LD1) and PC Engine add-on module, under an OEM license. A total of eleven LD-ROM2 titles were produced, with only three of them released in North America. Other foreign markets Outside North America and Japan, the TurboGrafx-16 console was released in South Korea by a third-party company, Haitai, under the name Vistar 16. It was based on the American version but with a new curved design. Daewoo Electronics distributed the PC Engine Shuttle in the South Korean market as well. Technical specifications The TurboGrafx-16 uses a Hudson Soft HuC6280 CPU—an 8-bit CPU modified with two 16-bit graphics processors—running at 7.16 MHz. It includes 8 KB of RAM, 64 KB of Video RAM, and the ability to display 482 colors at once from a 512-color palette. The sound hardware, built into the HuC6280 CPU, includes a PSG running at 3.58 MHz and a 5-10 bit stereo PCM. TurboGrafx-16 games use the HuCard ROM cartridge format, thin credit card-sized cards that insert into the front slot of the console. PC Engine HuCards have 38 connector pins. TurboGrafx-16 HuCards (alternatively referred to as "TurboChips") reverse eight of these pins as a region lockout method. The power switch on the console also acts as a lock that prevents HuCards from being removed while the system is powered on. The European release of the TurboGrafx-16 did not have its own PAL-formatted HuCards as a result of its limited release, with the system instead supporting standard HuCards and outputting a PAL 50 Hz video signal. Peripherals In Japan the PC Engine was originally sold with a standard controller known simply as the Pad. It has rectangular shape with a directional pad, two action buttons numbered "I" and "II", and two rubber "Select" and "Run" buttons, matching the number of buttons on the Famicom's primary controller (as well as a standard NES controller). Another controller known as the TurboPad was also launched separately with the console, which added two "Turbo" switches for the I and II buttons with three speed settings. The switches allow for a single button press to register multiple inputs at once (for instance, this allows for rapid fire in scrolling shooters). The TurboPad became standard-issue with the TurboGrafx-16 in North America, as well as subsequent models of the PC Engine in