Reply To: ps2 240p timings

[Zacabeb]

Since the signal gets oversampled, whichever timings produce the correct aspect ratio are the ones to go for unless you want pixel perfect sampling and scaling.

The timings I calculated were indeed based on the default BT.601 timings, with the assumption the game runs at 320 pixels width, doubled and centered within the 720 pixel active area.

The PlayStation2’s subpixel clock is usually quadruple BT.601 at ≈54 MHz, with the source resolution fit into the output through programmable pixel repetition. This means many standard raster widths (256, 320, 512, 640) get the same width in the output signal (2560 subpixels), while some others may not (384 for instance becomes slightly wider at 2688 subpixels). I don’t know what DonDonPachi DaiOuJou does to fit its resolution, but it might have set up the horizontal multiplier to a custom value.