http://tvtropes.org/pmwiki/pmwiki.php/UsefulNotes/TurboGrafx16
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The SFIX (System FIX) ROM is a 64KiB or 128KiB ROM containing the default fix layer tileset embedded in most MVS boards. It is used by the system ROM to display menus when no cartridges are inserted. It can be switched in or out with registers REG_BRDFIX and REG_CRTFIX.
The TurboGrafx-16, known as PC Engine in Japan, was a 16-bit console developed by Hudson Soft and sold by NEC that was released first in Japan in 1987 and in North America in 1989. Far more successful in Japan than it ever was elsewhere. Its mascot character was Bonk, or PC Genjin in Japan where the name was a clear pun on the system's name.
The most unique characteristic of the system was that the games did not come on bulky plastic cartridges but rather on thin TurboChips (HuCards in Japan), plastic game cards with connectors clearly visible on the end.
Discontinued? Yes indeed, the system did not sell very well in North America, competing as it did with massively successful Nintendo and Sega contemporaries. However its game library's inclusion on the Wii Virtual Console has lit the fires of nostalgia in the hearts of the few gamers who played and loved the thing, as well as introducing these old gems to a newer audience. The system was, however, extremely popular in Japan, outselling the original Famicom for a while. In fact, it was this success which, in conjunction with the success of the Sega Genesis in the U.S. and Europe (where, as in Japan, it was known as the Sega Mega Drive), is what forced Nintendo to jumpstart development of the Super Famicom in the first place. It was particularly favored for shoot 'em ups, and many of the Vertical Scrolling Shooters produced for the system offered a narrow-screen 'arcade mode' that distorted the aspect ratio to make the graphics seem even more arcade-like.
Like all the venerable systems, this one had a few add-ons of its own. One, the Multitap (a.k.a. Turbo Tap), was a connector for up to five controllers; since the TurboGrafx, unlike its competitors, only had one built-in controller port, this was necessary to enable multi-player in games that supported them. Another was the TurboGrafx-CD (PC Engine CD-ROM2 System) expansion, which opened more possibilities for the game library, especially with the Super System Card. The CD attachment was very successful in Japan, where it helped prolonged the lifespan of the system, but not so much elsewhere, to the point that only a handful of games were ever exported. NEC later released the Turbo Duo, a TurboGrafx console with a built-in CD-ROM drive along with extra RAM and updated BIOS from the Super System Card. The American release is infamous for its advertising campaign, Johnny Turbo. You can read the comics in their entirety here, as well as more info here.
One of the extensions of the PC Engine that was only released in Japan was the SuperGrafx, which added an extra video chip and more RAM to the core hardware. The hardware revision was a complete failure, only having five games exclusively released for it. Slightly more successful was the Arcade Card, released in 1994 in a late attempt to upgrade the capacities of the system; it was mostly noted for its ports of Neo Geo games.
Finally, in the portable market, TurboGrafx had a clear advantage thanks to its slim game cards. The TurboExpress handheld console (PC Engine GT in Japan) was able to use exactly the same cards as the main console, so that it was essentially a small, portable TG16 with a screen attached. Yes it was heavy, and yes it was a battery-guzzler, but it still was nice to have a lot of those games on the go.
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