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Resolution
The PSX doesn't really have a set of fixed resolutions. Instead the possible resolutions are limited by the PAL/NTSC standards and the five available pixelclock dividers of the PSX. Common resolutions have a width of 256, 320, 368, 384, 512 or 640 pixels and a height of 224, 240, 256, 480 or 512 rasterlines.
It is however possible to create both higher and lower resolutions.