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 262 lines total in a single frame (counting retrace lines, 224 active scan + 38 retrace scan). Multiplying 262 lines that must be drawn in a single frame by 60 frames, that comes to a frequency of 15,720Hz. 262 lines * 60 frames = 15,720Hz. Is this correct? PAL Mega Drives have 312 line in a frame. Would that make the horizontal interrupts 312 lines * 50 frames = 15,600Hz on PAL systems? Is this correct too?
Thanks!
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 262 lines total in a single frame (counting retrace lines, 224 active scan + 38 retrace scan). Multiplying 262 lines that must be drawn in a single frame by 60 frames, that comes to a frequency of 15,720Hz. 262 lines * 60 frames = 15,720Hz. Is this correct? PAL Mega Drives have 312 line in a frame. Would that make the horizontal interrupts 312 lines * 50 frames = 15,600Hz on PAL systems? Is this correct too?
Thanks!