Graphics

• I have read that the GB screen is tile based. What exactly does this mean?
• I have heard that the GBC can do more than 4 colo(u)rs per tile, has a secret high resolution mode, and can do 3D graphics in hardware. Is this true?
• How do I turn individual pixels on & off (i.e. APA graphics) instead of drawing with tiles?
• How do some games put more than 56 colo(u)rs on the screen?
• Can GBC palettes be set at any time?
• The GBC & SGB both support colo(u)r. Is graphics programming for them similar?
• What is the difference between the GB window and the GB background?
• Can any part of the window be made transparent?
• What precautions should I use when reading/writing video RAM?
• What precautions should I use when doing HDMA on a GBC?
• How do I know when an HDMA on the GBC has completed?
• What precautions should I use when doing GDMA on a GBC?
• How long does it take for a GDMA to execute on a GBC?
• I read somewhere that you must set GBC tile attributes before setting the GBC tile map. Is this true?
• I'm using the LYC interrupt as a trigger to modify the SCX and/or SCY scroll registers. I get some graphic "trash" on the screen line where the LYC occurs. Why? And how do I fix it?
• What are the video timing specs for the GB & GBC?
• Why do pictures in the background or window often appear distorted if you scroll them up or down 1 pixel each V-blank?
• Can the screen be turned off at any time & what assembly code should be used?
• Why does the GB have H-blank & V-blank periods in the video timing?