What are the video timing specs for the GB & GBC ?
Both the GB & the GBC have the same video timing specs. For more info on the various video modes refer to a reference for register STAT ($ff41). Horizontal lines which contain sprites have less H-Blank time available than lines with no sprites. No H-Blank time is available during an active HDMA: Complete horizontal line timing = 108.7 µsec V-Blank = 1.09 msec Mode 2 = 19.31 µsec (~20 machine cycles) Mode 3 = Variable between 41.37 µsec – 70.69 µsec Mode 0 = H-Blank = 108.7 µsec – 19.31 – Mode 11 Mode 0 minimum = 18.72 µsec (10 sprites on a line) Mode 0 maximum = 48.
Both the GB & the GBC have the same video timing specs. For more info on the various video modes refer to a reference for register STAT ($ff41). Horizontal lines which contain sprites have less H-Blank time available than lines with no sprites. No H-Blank time is available during an active HDMA: Complete horizontal line timing = 108.7 µsec V-Blank = 1.09 msec Mode 2 = 19.31 µsec (~20 machine cycles) Mode 3 = Variable between 41.37 µsec – 70.69 µsec Mode 0 = H-Blank = 108.7 µsec – 19.31 – Mode 3 Mode 0 minimum = 18.72 µsec (10 sprites on a line) Mode 0 maximum = 48.64 µsec (no sprites on a line) Each video line contains mode 2, mode 3 and mode 0 in that order. GBC palettes can be written during every mode except mode 3. An LYC interrupt occurs at the start of mode 2. An H-Blank interrupt occurs at the start of mode 0.
