Writing directly to the screen

back in the not so distant past i was using an assembly bit to work directly with the memory associated with video card. it was almost lightning fast and i loved it. (Q-BASIC days) but now i have an power book g4 and i cant get over the fact that my screen doesnt click when i change resolutions,(instant hard on) anyways, i really want to know about writing to the actual memory associated with the lcd. not some off-screen g-world pointer. but directly to the screen. i have invested time into reading through the macwindows.h and saw an GDHandle struct and i have troubles reading assembly when i dont know which contexts or pointers its refering to.

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