Add initial support for new VTxx handeld, SY-889 #3069
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This adds initial support for the SY-889 handheld I dumped recently, which uses some one of the VTxx enhanced-NES chips. The exact chipset is unknown and doesn't resemble any other VTxx system - as well as software differences, it uses QSPI flash instead of the parallel flash used by all other known VRT chipsets. Credit to NewRisingSun2 who helped with the reverse engineering.
At the moment the ROM will run, the colours are correct (the chipset uses a different palette format to the VT03, storing colours as RGB555), but there are serious graphical glitches on the intro and when the menu scrolls. Most of the games seem to run OK though. I think this is because of the scanline interrupt timing being off.
Reverse engineering thread: http://s4.zetaboards.com/PGC_Forums/topic/30178284/1/