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| == NTSC/PAL differences ==
| | #REDIRECT [[Cycle reference chart]] |
| Consoles in the USA and Europe run at different speeds due to the different television standards used. The main differences between the NTSC and PAL PPUs is as follows:
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| {| border=1
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| ! Property || NTSC || PAL
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| |-
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| | Master clock speed || 21.477272MHz<br>= 236.25 MHz / 11 || 26.601712MHz
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| |-
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| | PPU clock speed || 21.477272MHz / 4 || 26.601712MHz / 5
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| |-
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| | Corresponding CPU clock speed || 1/3 PPU clock speed || 1/3.2 PPU clock speed
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| |-
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| | Height of picture || 240 scanlines || 240 scanlines
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| |-
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| | Nominal visible picture height<br>(see [[Overscan]]) || 224 scanlines || 268 scanlines
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| |-
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| | Length of VBLANK || 20 scanlines || 70 scanlines
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| |-
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| | Timing quirks || First scanline is one PPU cycle shorter during every other frame || None
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| |}
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| Other than these differences (and video output), the NTSC and PAL PPUs function exactly the same.
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