Matt_H is right - since there are no distinct PAL/NTSC versions of neither OCS nor ECS Denise, either will work in both modes. Vertical scan timing comes from Agnus alone.
An OCS Denise is
- unable to vary the horizontal scan rate, thus no productivity or 31 kHz modes
- unable to produce SuperHires pixel rate (35 ns?)
Actually Denise is not the video chip in the general sense, it's more like the RAMDAC used in Wintel PCs (without the DAC part, this is the external Vidiot). Denise combines the bitplane data coming from Agnus, does the palette lookup (or HAM conversion) and serializes the data for output.
@SamuraiCrow
Denise has nothing to do with the amount of chip RAM available. An OCS Denise will even work fine in an A3000 or A500+ with 2 MB chip mem.
