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Interlacing

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The SNES supports interlacing. It is available only in Mode 5 and Mode 6. [3] It is enabled by setting bit 0 of SETINI. When enabled, the vertical resolution is doubled.

In interlacing on the SNES, the first field is called "odd" and the second field is called "even."

For even fields, the electron beam begins scanning at the top-middle of the screen instead of the top-left like in odd fields. For odd fields, it finishes scanning at the middle-bottom instead of the bottom-right like in even fields. [2]

References

  1. Official Super Nintendo development manual on interlacing: page 2-18-1 of Book I
  2. page 2-1-2 of Book I, lbid
  3. https://nesdoug.com/2022/05/30/other-modes