68k:Ports:600012

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  • Bits 13-8: LCD logical width = (64-n)*2 bytes ((64-n)*16 pixels)
  • Bits 7-0: LCD logical height = (256-n)

If the LCD logical height is less, the screen will appear darker, because each line is visited more often.

This port can be written to one byte at a time without disturbing the other byte.