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Hi, I was just wondering what the VDP port mirrors are and why they may be used? For example, why is there an address $C00002 that is the VDP Data Port (Mirror). The same goes for the VDP Control (Mirror), H/V Counter (Mirror) etc. Thank you!

Hello Again, I successfully resolved all my questions about horizontal interrupt technicalities. Just finished making a test program that displays 224 alternating red and blue lines by swapping the background color every horizontal interrupt. I'm trying another even more time sensitive...

Hello, This is my first post on SEGA Xtreme forums. I have a question about what the frequency of horizontal interrupts on the SEGA Genesis is. I've heard from other sources that it's the standard NTSC 15,734Hz. However, I've calculated the frequency to be 15,720Hz instead. An NTSC Genesis has...