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The enhancements SuperGrafx did have, compared to the PC-Engine, were the following:
* four times the amount of work RAM for the main CPU;
* a second video chip with its own video RAM;
* a priority controller chip that allowed the output of both video chips to be combined in various ways.
On the other hand, its single 8-bit CPU had a heavy workload managing the extra video hardware.
The SuperGrafx was largely a failure due to a lack of software written to support its enhanced abilities. Only 7 titles were ever released: five of these were exclusive titles, the other two were regular PC-Engine releases capable of enhanced graphics. There were no CD, SCD, or ACD games written that took advantage of the SuperGrafx platform. However, the SuperGrafx can play PCE HuCards, PCE CDs, PCE Super CDs, PCE Arcade CDs, and the native SuperGrafx HuCards. These titles combined totals to a very respectable library of near 700 titles.
One notable accessory was the Power Console, designed to add a full flight yoke, throttle and keypad to the SuperGrafx, sliding over the entire console. Besides a prototype, no Power Consoles were ever produced.
//(info from Wikipedia)//
===== Links =====
* NECstasy -- http://www.necstasy.net/
* Universo PCENGINE -- http://upce.netfirms.com/index.html
* Turbo Station 16 -- http://pcenginefx.com/TS/
* [[wp>SuperGrafx]]
===== Other Emulators =====
* MagicEngine (commercial) -- http://www.magicengine.com/
* Hu-Go! (for DOS, Windows, Linux, BeOS, Solaris) -- http://www.zeograd.com/
* Mednafen -- http://mednafen.sourceforge.net/